diff --git a/README.md b/README.md
index 039c888d..3c545e07 100644
--- a/README.md
+++ b/README.md
@@ -29,12 +29,6 @@ Interviews are daunting and can make even the most seasoned expert forget things
 
 <br>
 
-## Our sponsors
-
-<a href="https://www.digitalocean.com/"><img src="digitalocean.png" alt="DigitalOcean logo"></a>
-
-<br>
-
 ## Contributing
 
 > 30 seconds of interviews is a community effort, so feel free to contribute in any way you can. Every contribution helps!
@@ -224,6 +218,31 @@ Join our [Gitter channel](https://gitter.im/30-seconds-of-interviews/Lobby) to h
 ---
 
 ## JavaScript
+### What is a stateless component?
+
+<details>
+<summary>View answer</summary>
+
+A stateless component is a component whose behavior does not depend on its state. Stateless components can be either functional or class components. Stateless functional components are easier to maintain and test since they are guaranteed to produce the same output given the same props. Stateless functional components should be preferred when lifecycle hooks don't need to be used.
+
+
+#### Good to hear
+
+
+* Stateless components are independent of their state.
+* Stateless components can be either class or functional components.
+* Stateless functional components avoid the `this` keyword altogether.
+
+
+##### Additional Links
+
+
+* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is the difference between the equality operators `==` and `===`?
 
 <details>
@@ -282,38 +301,45 @@ const domNodeElement = <div />
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the difference between the postfix `i++` and prefix `++i` increment operators?
+### What is a stateful component in React?
 
 <details>
 <summary>View answer</summary>
 
-Both increment the variable value by 1. The difference is what they evaluate to.
-
-The postfix increment operator evaluates to the value _before_ it was incremented.
+A stateful component is a component whose behavior depends on its state. This means that two separate instances of the component if given the same props will not necessarily render the same output, unlike pure function components.
 
 ```js
-let i = 0
-i++ // 0
-// i === 1
-```
-
-The prefix increment operator evaluates to the value _after_ it was incremented.
+// Stateful class component
+class App extends Component {
+  constructor(props) {
+    super(props)
+    this.state = { count: 0 }
+  }
+  render() {
+    // ...
+  }
+}
 
-```js
-let i = 0
-++i // 1
-// i === 1
+// Stateful function component
+function App() {
+  const [count, setCount] = useState(0)
+  return // ...
+}
 ```
 
 
 #### Good to hear
 
 
+* Stateful components have internal state that they depend on.
+* Stateful components are class components or function components that use stateful Hooks.
+* Stateful components have their state initialized in the constructor or with `useState()`.
 
 
 ##### Additional Links
 
 
+* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
 
 </details>
 
@@ -348,70 +374,38 @@ When either of these options happens, the associated handlers queued up by a pro
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is a stateful component in React?
+### What is the difference between the postfix `i++` and prefix `++i` increment operators?
 
 <details>
 <summary>View answer</summary>
 
-A stateful component is a component whose behavior depends on its state. This means that two separate instances of the component if given the same props will not necessarily render the same output, unlike pure function components.
+Both increment the variable value by 1. The difference is what they evaluate to.
 
-```js
-// Stateful class component
-class App extends Component {
-  constructor(props) {
-    super(props)
-    this.state = { count: 0 }
-  }
-  render() {
-    // ...
-  }
-}
+The postfix increment operator evaluates to the value _before_ it was incremented.
 
-// Stateful function component
-function App() {
-  const [count, setCount] = useState(0)
-  return // ...
-}
+```js
+let i = 0
+i++ // 0
+// i === 1
 ```
 
+The prefix increment operator evaluates to the value _after_ it was incremented.
 
-#### Good to hear
-
-
-* Stateful components have internal state that they depend on.
-* Stateful components are class components or function components that use stateful Hooks.
-* Stateful components have their state initialized in the constructor or with `useState()`.
-
-
-##### Additional Links
-
-
-* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is a stateless component?
-
-<details>
-<summary>View answer</summary>
-
-A stateless component is a component whose behavior does not depend on its state. Stateless components can be either functional or class components. Stateless functional components are easier to maintain and test since they are guaranteed to produce the same output given the same props. Stateless functional components should be preferred when lifecycle hooks don't need to be used.
+```js
+let i = 0
+++i // 1
+// i === 1
+```
 
 
 #### Good to hear
 
 
-* Stateless components are independent of their state.
-* Stateless components can be either class or functional components.
-* Stateless functional components avoid the `this` keyword altogether.
 
 
 ##### Additional Links
 
 
-* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
 
 </details>
 
@@ -481,24 +475,18 @@ const batches = (recipe, available) =>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Create a standalone function `bind` that is functionally equivalent to the method `Function.prototype.bind`.
+### What does the following code evaluate to?
 
 ```js
-function example() {
-  console.log(this)
-}
-const boundExample = bind(example, { a: true })
-boundExample.call({ b: true }) // logs { a: true }
+typeof typeof 0
 ```
 
 <details>
 <summary>View answer</summary>
 
-Return a function that accepts an arbitrary number of arguments by gathering them with the rest `...` operator. From that function, return the result of calling the `fn` with `Function.prototype.apply` to apply the context and the array of arguments to the function.
+It evaluates to `"string"`.
 
-```js
-const bind = (fn, context) => (...args) => fn.apply(context, args)
-```
+`typeof 0` evaluates to the string `"number"` and therefore `typeof "number"` evaluates to `"string"`.
 
 
 #### Good to hear
@@ -509,121 +497,73 @@ const bind = (fn, context) => (...args) => fn.apply(context, args)
 ##### Additional Links
 
 
+* [MDN docs for typeof](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the purpose of callback function as an argument of `setState`?
+### How do you clone an object in JavaScript?
 
 <details>
 <summary>View answer</summary>
 
-The callback function is invoked when `setState` has finished and the component gets rendered. Since `setState` is asynchronous, the callback function is used for any post action.
+Using the object spread operator `...`, the object's own enumerable properties can be copied
+into the new object. This creates a shallow clone of the object.
 
 ```js
-setState({ name: "sudheer" }, () => {
-  console.log("The name has updated and component re-rendered")
-})
+const obj = { a: 1, b: 2 }
+const shallowClone = { ...obj }
 ```
 
+With this technique, prototypes are ignored. In addition, nested objects are not cloned, but rather their references get copied, so nested objects still refer to the same objects as the original. Deep-cloning is much more complex in order to effectively clone any type of object (Date, RegExp, Function, Set, etc) that may be nested within the object.
 
-#### Good to hear
-
-
-* The callback function is invoked after `setState` finishes and is used for any post action.
-* It is recommended to use lifecycle method rather this callback function.
-
-
-##### Additional Links
-
-
-* [React docs on `setState`](https://reactjs.org/docs/react-component.html#setstate)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is a callback? Can you show an example using one?
-
-<details>
-<summary>View answer</summary>
-
-Callbacks are functions passed as an argument to another function to be executed once an event has occurred or a certain task is complete, often used in asynchronous code. Callback functions are invoked later by a piece of code but can be declared on initialization without being invoked.
-
-As an example, event listeners are asynchronous callbacks that are only executed when a specific event occurs.
-
-```js
-function onClick() {
-  console.log("The user clicked on the page.")
-}
-document.addEventListener("click", onClick)
-```
-
-However, callbacks can also be synchronous. The following `map` function takes a callback function that is invoked synchronously for each iteration of the loop (array element).
+Other alternatives include:
 
-```js
-const map = (arr, callback) => {
-  const result = []
-  for (let i = 0; i < arr.length; i++) {
-    result.push(callback(arr[i], i))
-  }
-  return result
-}
-map([1, 2, 3, 4, 5], n => n * 2) // [2, 4, 6, 8, 10]
-```
+* `JSON.parse(JSON.stringify(obj))` can be used to deep-clone a simple object, but it is CPU-intensive and only accepts valid JSON (therefore it strips functions and does not allow circular references).
+* `Object.assign({}, obj)` is another alternative.
+* `Object.keys(obj).reduce((acc, key) => (acc[key] = obj[key], acc), {})` is another more verbose alternative that shows the concept in greater depth.
 
 
 #### Good to hear
 
 
-* Functions are first-class objects in JavaScript
-* Callbacks vs Promises
+* JavaScript passes objects by reference, meaning that nested objects get their references copied, instead of their values.
+* The same method can be used to merge two objects.
 
 
 ##### Additional Links
 
 
-* [MDN docs for callbacks](https://developer.mozilla.org/en-US/docs/Glossary/Callback_function)
+* [MDN docs for Object.assign()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
+* [Clone an object in vanilla JS](http://voidcanvas.com/clone-an-object-in-vanilla-js-in-depth/)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### How do you clone an object in JavaScript?
+### What is the difference between synchronous and asynchronous code in JavaScript?
 
 <details>
 <summary>View answer</summary>
 
-Using the object spread operator `...`, the object's own enumerable properties can be copied
-into the new object. This creates a shallow clone of the object.
-
-```js
-const obj = { a: 1, b: 2 }
-const shallowClone = { ...obj }
-```
-
-With this technique, prototypes are ignored. In addition, nested objects are not cloned, but rather their references get copied, so nested objects still refer to the same objects as the original. Deep-cloning is much more complex in order to effectively clone any type of object (Date, RegExp, Function, Set, etc) that may be nested within the object.
+Synchronous means each operation must wait for the previous one to complete.
 
-Other alternatives include:
+Asynchronous means an operation can occur while another operation is still being processed.
 
-* `JSON.parse(JSON.stringify(obj))` can be used to deep-clone a simple object, but it is CPU-intensive and only accepts valid JSON (therefore it strips functions and does not allow circular references).
-* `Object.assign({}, obj)` is another alternative.
-* `Object.keys(obj).reduce((acc, key) => (acc[key] = obj[key], acc), {})` is another more verbose alternative that shows the concept in greater depth.
+In JavaScript, all code is synchronous due to the single-threaded nature of it. However, asynchronous operations not part of the program (such as `XMLHttpRequest` or `setTimeout`) are processed outside of the main thread because they are controlled by native code (browser APIs), but callbacks part of the program will still be executed synchronously.
 
 
 #### Good to hear
 
 
-* JavaScript passes objects by reference, meaning that nested objects get their references copied, instead of their values.
-* The same method can be used to merge two objects.
+* JavaScript has a concurrency model based on an "event loop".
+* Functions like `alert` block the main thread so that no user input is registered until the user closes it.
 
 
 ##### Additional Links
 
 
-* [MDN docs for Object.assign()](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
-* [Clone an object in vanilla JS](http://voidcanvas.com/clone-an-object-in-vanilla-js-in-depth/)
 
 </details>
 
@@ -702,6 +642,36 @@ function isDeepEqual(obj1, obj2, testPrototypes = false) {
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What is a cross-site scripting attack (XSS) and how do you prevent it?
+
+<details>
+<summary>View answer</summary>
+
+XSS refers to client-side code injection where the attacker injects malicious scripts into a legitimate website or web application. This is often achieved when the application does not validate user input and freely injects dynamic HTML content.
+
+For example, a comment system will be at risk if it does not validate or escape user input. If the comment contains unescaped HTML, the comment can inject a `<script>` tag into the website that other users will execute against their knowledge.
+
+* The malicious script has access to cookies which are often used to store session tokens. If an attacker can obtain a user’s session cookie, they can impersonate the user.
+* The script can arbitrarily manipulate the DOM of the page the script is executing in, allowing the attacker to insert pieces of content that appear to be a real part of the website.
+* The script can use AJAX to send HTTP requests with arbitrary content to arbitrary destinations.
+
+
+#### Good to hear
+
+
+* On the client, using `textContent` instead of `innerHTML` prevents the browser from running the string through the HTML parser which would execute scripts in it.
+* On the server, escaping HTML tags will prevent the browser from parsing the user input as actual HTML and therefore won't execute the script.
+
+
+##### Additional Links
+
+
+* [Cross-Site Scripting Attack (XSS)](https://www.acunetix.com/websitesecurity/cross-site-scripting/)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is CORS?
 
 <details>
@@ -756,6 +726,122 @@ The DOM (Document Object Model) is a cross-platform API that treats HTML and XML
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### Create a standalone function `bind` that is functionally equivalent to the method `Function.prototype.bind`.
+
+```js
+function example() {
+  console.log(this)
+}
+const boundExample = bind(example, { a: true })
+boundExample.call({ b: true }) // logs { a: true }
+```
+
+<details>
+<summary>View answer</summary>
+
+Return a function that accepts an arbitrary number of arguments by gathering them with the rest `...` operator. From that function, return the result of calling the `fn` with `Function.prototype.apply` to apply the context and the array of arguments to the function.
+
+```js
+const bind = (fn, context) => (...args) => fn.apply(context, args)
+```
+
+
+#### Good to hear
+
+
+
+
+##### Additional Links
+
+
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are the differences between `var`, `let`, `const` and no keyword statements?
+
+<details>
+<summary>View answer</summary>
+
+##### No keyword
+
+When no keyword exists before a variable assignment, it is either assigning a global variable if one does not exist, or reassigns an already declared variable. In non-strict mode, if the variable has not yet been declared, it will assign the variable as a property of the global object (`window` in browsers). In strict mode, it will throw an error to prevent unwanted global variables from being created.
+
+##### var
+
+`var` was the default statement to declare a variable until ES2015. It creates a function-scoped variable that can be reassigned and redeclared. However, due to its lack of block scoping, it can cause issues if the variable is being reused in a loop that contains an asynchronous callback because the variable will continue to exist outside of the block scope.
+
+Below, by the time the the `setTimeout` callback executes, the loop has already finished and the `i` variable is `10`, so all ten callbacks reference the same variable available in the function scope.
+
+```js
+for (var i = 0; i < 10; i++) {
+  setTimeout(() => {
+    // logs `10` ten times
+    console.log(i)
+  })
+}
+
+/* Solutions with `var` */
+for (var i = 0; i < 10; i++) {
+  // Passed as an argument will use the value as-is in
+  // that point in time
+  setTimeout(console.log, 0, i)
+}
+
+for (var i = 0; i < 10; i++) {
+  // Create a new function scope that will use the value
+  // as-is in that point in time
+  ;(i => {
+    setTimeout(() => {
+      console.log(i)
+    })
+  })(i)
+}
+```
+
+##### let
+
+`let` was introduced in ES2015 and is the new preferred way to declare variables that will be reassigned later. Trying to redeclare a variable again will throw an error. It is block-scoped so that using it in a loop will keep it scoped to the iteration.
+
+```js
+for (let i = 0; i < 10; i++) {
+  setTimeout(() => {
+    // logs 0, 1, 2, 3, ...
+    console.log(i)
+  })
+}
+```
+
+##### const
+
+`const` was introduced in ES2015 and is the new preferred default way to declare all variables if they won't be reassigned later, even for objects that will be mutated (as long as the reference to the object does not change). It is block-scoped and cannot be reassigned.
+
+```js
+const myObject = {}
+myObject.prop = "hello!" // No error
+myObject = "hello" // Error
+```
+
+
+#### Good to hear
+
+
+* All declarations are hoisted to the top of their scope.
+* However, with `let` and `const` there is a concept called the temporal dead zone (TDZ). While the declarations are still hoisted, there is a period between entering scope and being declared where they cannot be accessed.
+* Show a common issue with using `var` and how `let` can solve it, as well as a solution that keeps `var`.
+* `var` should be avoided whenever possible and prefer `const` as the default declaration statement for all variables unless they will be reassigned later, then use `let` if so.
+
+
+##### Additional Links
+
+
+* [`let` vs `const`](https://wesbos.com/let-vs-const/)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is event delegation and why is it useful? Can you show an example of how to use it?
 
 <details>
@@ -804,6 +890,36 @@ document.addEventListener("click", e => {
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What is the purpose of callback function as an argument of `setState`?
+
+<details>
+<summary>View answer</summary>
+
+The callback function is invoked when `setState` has finished and the component gets rendered. Since `setState` is asynchronous, the callback function is used for any post action.
+
+```js
+setState({ name: "sudheer" }, () => {
+  console.log("The name has updated and component re-rendered")
+})
+```
+
+
+#### Good to hear
+
+
+* The callback function is invoked after `setState` finishes and is used for any post action.
+* It is recommended to use lifecycle method rather this callback function.
+
+
+##### Additional Links
+
+
+* [React docs on `setState`](https://reactjs.org/docs/react-component.html#setstate)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is the difference between an expression and a statement in JavaScript?
 
 <details>
@@ -1022,121 +1138,241 @@ Both methods iterate through the elements of an array. `map()` maps each element
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What will the console log in this example?
-
-```js
-var foo = 1
-var foobar = function() {
-  console.log(foo)
-  var foo = 2
-}
-foobar()
-```
+### What is short-circuit evaluation in JavaScript?
 
 <details>
 <summary>View answer</summary>
 
-Due to hoisting, the local variable `foo` is declared before the `console.log` method is called. This means the local variable `foo` is passed as an argument to `console.log()` instead of the global one declared outside of the function. However, since the value is not hoisted with the variable declaration, the output will be `undefined`, not `2`.
-
-
-#### Good to hear
-
-
-* Hoisting is JavaScript’s default behavior of moving declarations to the top
-* Mention of `strict` mode
-
-
-##### Additional Links
-
-
-* [MDN docs for hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
+Short-circuit evaluation involves logical operations evaluating from left-to-right and stopping early.
 
-### How does hoisting work in JavaScript?
+```js
+true || false
+```
 
-<details>
-<summary>View answer</summary>
+In the above sample using logical OR, JavaScript won't look at the second operand `false`, because the expression evaluates to `true` regardless. This is known as short-circuit evaluation.
 
-Hoisting is a JavaScript mechanism where variable and function declarations are put into memory during the compile phase. This means that no matter where functions and variables are declared, they are moved to the top of their scope regardless of whether their scope is global or local.
+This also works for logical AND.
 
-However, the value is not hoisted with the declaration.
+```js
+false && true
+```
 
-The following snippet:
+This means you can have an expression that throws an error if evaluated, and it won't cause issues.
 
 ```js
-console.log(hoist)
-var hoist = "value"
+true || nonexistentFunction()
+false && nonexistentFunction()
 ```
 
-is equivalent to:
+This remains true for multiple operations because of left-to-right evaluation.
 
 ```js
-var hoist
-console.log(hoist)
-hoist = "value"
+true || nonexistentFunction() || window.nothing.wouldThrowError
+true || window.nothing.wouldThrowError
+true
 ```
 
-Therefore logging `hoist` outputs `undefined` to the console, not `"value"`.
-
-Hoisting also allows you to invoke a function declaration before it appears to be declared in a program.
+A common use case for this behavior is setting default values. If the first operand is falsy the second operand will be evaluated.
 
 ```js
-myFunction() // No error; logs "hello"
-function myFunction() {
-  console.log("hello")
-}
+const options = {}
+const setting = options.setting || "default"
+setting // "default"
 ```
 
-But be wary of function expressions that are assigned to a variable:
+Another common use case is only evaluating an expression if the first operand is truthy.
 
 ```js
-myFunction() // Error: `myFunction` is not a function
-var myFunction = function() {
-  console.log("hello")
-}
+// Instead of:
+addEventListener("click", e => {
+  if (e.target.closest("button")) {
+    handleButtonClick(e)
+  }
+})
+
+// You can take advantage of short-circuit evaluation:
+addEventListener(
+  "click",
+  e => e.target.closest("button") && handleButtonClick(e)
+)
 ```
 
+In the above case, if `e.target` is not or does not contain an element matching the `"button"` selector, the function will not be called. This is because the first operand will be falsy, causing the second operand to not be evaluated.
+
 
 #### Good to hear
 
 
-* Hoisting is JavaScript’s default behavior of moving declarations to the top
-* Functions declarations are hoisted before variable declarations
+* Logical operations do not produce a boolean unless the operand(s) evaluate to a boolean.
 
 
 ##### Additional Links
 
 
-* [MDN docs for hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
-* [Understanding Hoisting in JavaScript](https://scotch.io/tutorials/understanding-hoisting-in-javascript)
+* [JavaScript: What is short-circuit evaluation?](https://codeburst.io/javascript-what-is-short-circuit-evaluation-ff22b2f5608c)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the difference between HTML and React event handling?
+### Are semicolons required in JavaScript?
 
 <details>
 <summary>View answer</summary>
 
-In HTML, the attribute name is in all lowercase and is given a string invoking a function defined somewhere:
+Sometimes. Due to JavaScript's automatic semicolon insertion, the interpreter places semicolons after most statements. This means semicolons can be omitted in most cases.
 
-```html
-<button onclick="handleClick()"></button>
-```
+However, there are some cases where they are required. They are not required at the beginning of a block, but are if they follow a line and:
 
-In React, the attribute name is camelCase and are passed the function reference inside curly braces:
+1.  The line starts with `[`
 
 ```js
-<button onClick={handleClick} />
+const previousLine = 3
+;[1, 2, previousLine].map(n => n * 2)
 ```
 
-In HTML, `false` can be returned to prevent default behavior, whereas in React `preventDefault` has to be called explicitly.
+2.  The line starts with `(`
 
-```html
+```js
+const previousLine = 3
+;(function() {
+  // ...
+})()
+```
+
+In the above cases, the interpreter does not insert a semicolon after `3`, and therefore it will see the `3` as attempting object property access or being invoked as a function, which will throw errors.
+
+
+#### Good to hear
+
+
+* Semicolons are usually optional in JavaScript but have edge cases where they are required.
+* If you don't use semicolons, tools like Prettier will insert semicolons for you in the places where they are required on save in a text editor to prevent errors.
+
+
+##### Additional Links
+
+
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What will the console log in this example?
+
+```js
+var foo = 1
+var foobar = function() {
+  console.log(foo)
+  var foo = 2
+}
+foobar()
+```
+
+<details>
+<summary>View answer</summary>
+
+Due to hoisting, the local variable `foo` is declared before the `console.log` method is called. This means the local variable `foo` is passed as an argument to `console.log()` instead of the global one declared outside of the function. However, since the value is not hoisted with the variable declaration, the output will be `undefined`, not `2`.
+
+
+#### Good to hear
+
+
+* Hoisting is JavaScript’s default behavior of moving declarations to the top
+* Mention of `strict` mode
+
+
+##### Additional Links
+
+
+* [MDN docs for hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### How does hoisting work in JavaScript?
+
+<details>
+<summary>View answer</summary>
+
+Hoisting is a JavaScript mechanism where variable and function declarations are put into memory during the compile phase. This means that no matter where functions and variables are declared, they are moved to the top of their scope regardless of whether their scope is global or local.
+
+However, the value is not hoisted with the declaration.
+
+The following snippet:
+
+```js
+console.log(hoist)
+var hoist = "value"
+```
+
+is equivalent to:
+
+```js
+var hoist
+console.log(hoist)
+hoist = "value"
+```
+
+Therefore logging `hoist` outputs `undefined` to the console, not `"value"`.
+
+Hoisting also allows you to invoke a function declaration before it appears to be declared in a program.
+
+```js
+myFunction() // No error; logs "hello"
+function myFunction() {
+  console.log("hello")
+}
+```
+
+But be wary of function expressions that are assigned to a variable:
+
+```js
+myFunction() // Error: `myFunction` is not a function
+var myFunction = function() {
+  console.log("hello")
+}
+```
+
+
+#### Good to hear
+
+
+* Hoisting is JavaScript’s default behavior of moving declarations to the top
+* Functions declarations are hoisted before variable declarations
+
+
+##### Additional Links
+
+
+* [MDN docs for hoisting](https://developer.mozilla.org/en-US/docs/Glossary/Hoisting)
+* [Understanding Hoisting in JavaScript](https://scotch.io/tutorials/understanding-hoisting-in-javascript)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What is the difference between HTML and React event handling?
+
+<details>
+<summary>View answer</summary>
+
+In HTML, the attribute name is in all lowercase and is given a string invoking a function defined somewhere:
+
+```html
+<button onclick="handleClick()"></button>
+```
+
+In React, the attribute name is camelCase and are passed the function reference inside curly braces:
+
+```js
+<button onClick={handleClick} />
+```
+
+In HTML, `false` can be returned to prevent default behavior, whereas in React `preventDefault` has to be called explicitly.
+
+```html
 <a href="#" onclick="console.log('The link was clicked.'); return false" />
 ```
 
@@ -1198,6 +1434,38 @@ myLibrary.publicMethod() // 2
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What does the following function return?
+
+```js
+function greet() {
+  return
+  {
+    message: "hello"
+  }
+}
+```
+
+<details>
+<summary>View answer</summary>
+
+Because of JavaScript's automatic semicolon insertion (ASI), the compiler places a semicolon after `return` keyword and therefore it returns `undefined` without an error being thrown.
+
+
+#### Good to hear
+
+
+* Automatic semicolon placement can lead to time-consuming bugs
+
+
+##### Additional Links
+
+
+* [Automatic semicolon insertion in JavaScript](http://2ality.com/2011/05/semicolon-insertion.html)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What are inline conditional expressions?
 
 <details>
@@ -1347,116 +1615,280 @@ const mask = (str, maskChar = "#") =>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is a MIME type and what is it used for?
+### What is the output of the following code?
+
+```js
+const a = [1, 2, 3]
+const b = [1, 2, 3]
+const c = "1,2,3"
+
+console.log(a == c)
+console.log(a == b)
+```
 
 <details>
 <summary>View answer</summary>
 
-`MIME` is an acronym for `Multi-purpose Internet Mail Extensions`. It is used as a standard way of classifying file types over the Internet.
+The first `console.log` outputs `true` because JavaScript's compiler performs type conversion and therefore it compares to strings by their value. On the other hand, the second `console.log` outputs `false` because Arrays are Objects and Objects are compared by reference.
 
 
 #### Good to hear
 
 
-* A `MIME type` actually has two parts: a type and a subtype that are separated by a slash (/). For example, the `MIME type` for Microsoft Word files is `application/msword` (i.e., type is application and the subtype is msword).
+* JavaScript performs automatic type conversion
+* Objects are compared by reference
+* Primitives are compared by value
 
 
 ##### Additional Links
 
 
-* [MIME Type MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types)
+* [JavaScript Value vs Reference](https://medium.com/dailyjs/back-to-roots-javascript-value-vs-reference-8fb69d587a18)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### NodeJS often uses a callback pattern where if an error is encountered during execution, this error is passed as the first argument to the callback. What are the advantages of this pattern?
-
-```js
-fs.readFile(filePath, function(err, data) {
-  if (err) {
-    // handle the error, the return is important here
-    // so execution stops here
-    return console.log(err)
-  }
-  // use the data object
-  console.log(data)
-})
-```
+### How does prototypal inheritance differ from classical inheritance?
 
 <details>
 <summary>View answer</summary>
 
-Advantages include:
-
-* Not needing to process data if there is no need to even reference it
-* Having a consistent API leads to more adoption
-* Ability to easily adapt a callback pattern that will lead to more maintainable code
-
-As you can see from below example, the callback is called with null as its first argument if there is no error. However, if there is an error, you create an Error object, which then becomes the callback's only parameter. The callback function allows a user to easily know whether or not an error occurred.
-
-This practice is also called the _Node.js error convention_, and this kind of callback implementations are called _error-first callbacks_.
-
-```js
-var isTrue = function(value, callback) {
-  if (value === true) {
-    callback(null, "Value was true.")
-  } else {
-    callback(new Error("Value is not true!"))
-  }
-}
-
-var callback = function(error, retval) {
-  if (error) {
-    console.log(error)
-    return
-  }
-  console.log(retval)
-}
-
-isTrue(false, callback)
-isTrue(true, callback)
+In the classical inheritance paradigm, object instances inherit their properties and functions from a class, which acts as a blueprint for the object. Object instances are typically created using a constructor and the `new` keyword.
 
-/*
-  { stack: [Getter/Setter],
-    arguments: undefined,
-    type: undefined,
-    message: 'Value is not true!' }
-  Value was true.
-*/
-```
+In the prototypal inheritance paradigm, object instances inherit directly from other objects and are typically created using factory functions or `Object.create()`.
 
 
 #### Good to hear
 
 
-* This is just a convention. However, you should stick to it.
 
 
 ##### Additional Links
 
 
-* [The Node.js Way Understanding Error-First Callbacks](http://fredkschott.com/post/2014/03/understanding-error-first-callbacks-in-node-js/)
-* [What are the error conventions?](https://docs.nodejitsu.com/articles/errors/what-are-the-error-conventions)
+* [MDN docs for inheritance and the prototype chain](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the difference between `null` and `undefined`?
+### What is a MIME type and what is it used for?
 
 <details>
 <summary>View answer</summary>
 
-In JavaScript, two values discretely represent nothing - `undefined` and `null`. The concrete difference between them is that `null` is explicit, while `undefined` is implicit. When a property does not exist or a variable has not been given a value, the value is `undefined`. `null` is set as the value to explicitly indicate “no value”. In essence, `undefined` is used when the nothing is not known, and `null` is used when the nothing is known.
+`MIME` is an acronym for `Multi-purpose Internet Mail Extensions`. It is used as a standard way of classifying file types over the Internet.
 
 
 #### Good to hear
 
 
-* `typeof undefined` evaluates to `"undefined"`.
-* `typeof null` evaluates `"object"`. However, it is still a primitive value and this is considered an implementation bug in JavaScript.
-* `undefined == null` evaluates to `true`.
+* A `MIME type` actually has two parts: a type and a subtype that are separated by a slash (/). For example, the `MIME type` for Microsoft Word files is `application/msword` (i.e., type is application and the subtype is msword).
+
+
+##### Additional Links
+
+
+* [MIME Type MDN](https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are Promises?
+
+<details>
+<summary>View answer</summary>
+
+The `Promise` object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value.
+An example can be the following snippet, which after 100ms prints out the result string to the standard output. Also, note the catch, which can be used for error handling. `Promise`s are chainable.
+
+```js
+new Promise((resolve, reject) => {
+  setTimeout(() => {
+    resolve("result")
+  }, 100)
+})
+  .then(console.log)
+  .catch(console.error)
+```
+
+
+#### Good to hear
+
+
+* Take a look into the other questions regarding `Promise`s!
+
+
+##### Additional Links
+
+
+* [Master the JavaScript Interview: What is a Promise?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-promise-27fc71e772618)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are JavaScript data types?
+
+<details>
+<summary>View answer</summary>
+
+The latest ECMAScript standard defines seven data types, six of them being primitive: `Boolean`, `Null`, `Undefined`, `Number`, `String`, `Symbol` and one non-primitive data type: `Object`.
+
+
+#### Good to hear
+
+
+* Mention of newly added `Symbol` data type
+* `Array`, `Date` and `function` are all of type `object`
+* Functions in JavaScript are objects with the capability of being callable
+
+
+##### Additional Links
+
+
+* [MDN docs for data types and data structures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures)
+* [Understanding Data Types in JavaScript](https://www.digitalocean.com/community/tutorials/understanding-data-types-in-javascript)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### NodeJS often uses a callback pattern where if an error is encountered during execution, this error is passed as the first argument to the callback. What are the advantages of this pattern?
+
+```js
+fs.readFile(filePath, function(err, data) {
+  if (err) {
+    // handle the error, the return is important here
+    // so execution stops here
+    return console.log(err)
+  }
+  // use the data object
+  console.log(data)
+})
+```
+
+<details>
+<summary>View answer</summary>
+
+Advantages include:
+
+* Not needing to process data if there is no need to even reference it
+* Having a consistent API leads to more adoption
+* Ability to easily adapt a callback pattern that will lead to more maintainable code
+
+As you can see from below example, the callback is called with null as its first argument if there is no error. However, if there is an error, you create an Error object, which then becomes the callback's only parameter. The callback function allows a user to easily know whether or not an error occurred.
+
+This practice is also called the _Node.js error convention_, and this kind of callback implementations are called _error-first callbacks_.
+
+```js
+var isTrue = function(value, callback) {
+  if (value === true) {
+    callback(null, "Value was true.")
+  } else {
+    callback(new Error("Value is not true!"))
+  }
+}
+
+var callback = function(error, retval) {
+  if (error) {
+    console.log(error)
+    return
+  }
+  console.log(retval)
+}
+
+isTrue(false, callback)
+isTrue(true, callback)
+
+/*
+  { stack: [Getter/Setter],
+    arguments: undefined,
+    type: undefined,
+    message: 'Value is not true!' }
+  Value was true.
+*/
+```
+
+
+#### Good to hear
+
+
+* This is just a convention. However, you should stick to it.
+
+
+##### Additional Links
+
+
+* [The Node.js Way Understanding Error-First Callbacks](http://fredkschott.com/post/2014/03/understanding-error-first-callbacks-in-node-js/)
+* [What are the error conventions?](https://docs.nodejitsu.com/articles/errors/what-are-the-error-conventions)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What is a callback? Can you show an example using one?
+
+<details>
+<summary>View answer</summary>
+
+Callbacks are functions passed as an argument to another function to be executed once an event has occurred or a certain task is complete, often used in asynchronous code. Callback functions are invoked later by a piece of code but can be declared on initialization without being invoked.
+
+As an example, event listeners are asynchronous callbacks that are only executed when a specific event occurs.
+
+```js
+function onClick() {
+  console.log("The user clicked on the page.")
+}
+document.addEventListener("click", onClick)
+```
+
+However, callbacks can also be synchronous. The following `map` function takes a callback function that is invoked synchronously for each iteration of the loop (array element).
+
+```js
+const map = (arr, callback) => {
+  const result = []
+  for (let i = 0; i < arr.length; i++) {
+    result.push(callback(arr[i], i))
+  }
+  return result
+}
+map([1, 2, 3, 4, 5], n => n * 2) // [2, 4, 6, 8, 10]
+```
+
+
+#### Good to hear
+
+
+* Functions are first-class objects in JavaScript
+* Callbacks vs Promises
+
+
+##### Additional Links
+
+
+* [MDN docs for callbacks](https://developer.mozilla.org/en-US/docs/Glossary/Callback_function)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What is the difference between `null` and `undefined`?
+
+<details>
+<summary>View answer</summary>
+
+In JavaScript, two values discretely represent nothing - `undefined` and `null`. The concrete difference between them is that `null` is explicit, while `undefined` is implicit. When a property does not exist or a variable has not been given a value, the value is `undefined`. `null` is set as the value to explicitly indicate “no value”. In essence, `undefined` is used when the nothing is not known, and `null` is used when the nothing is known.
+
+
+#### Good to hear
+
+
+* `typeof undefined` evaluates to `"undefined"`.
+* `typeof null` evaluates `"object"`. However, it is still a primitive value and this is considered an implementation bug in JavaScript.
+* `undefined == null` evaluates to `true`.
 
 
 ##### Additional Links
@@ -1644,923 +2076,369 @@ You can use an arrow function to wrap around an event handler and pass arguments
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are Promises?
+### What are fragments?
 
 <details>
 <summary>View answer</summary>
 
-The `Promise` object represents the eventual completion (or failure) of an asynchronous operation, and its resulting value.
-An example can be the following snippet, which after 100ms prints out the result string to the standard output. Also, note the catch, which can be used for error handling. `Promise`s are chainable.
+Fragments allow a React component to return multiple elements without a wrapper, by grouping the children without adding extra elements to the DOM. Fragments offer better performance, lower memory usage, a cleaner DOM and can help in dealing with certain CSS mechanisms (e.g. tables, Flexbox and Grid).
 
 ```js
-new Promise((resolve, reject) => {
-  setTimeout(() => {
-    resolve("result")
-  }, 100)
-})
-  .then(console.log)
-  .catch(console.error)
+render() {
+  return (
+    <React.Fragment>
+      <ChildA />
+      <ChildB />
+      <ChildC />
+    </React.Fragment>
+  );
+}
+
+// Short syntax supported by Babel 7
+render() {
+  return (
+    <>
+      <ChildA />
+      <ChildB />
+      <ChildC />
+    </>
+  );
+}
 ```
 
 
 #### Good to hear
 
 
-* Take a look into the other questions regarding `Promise`s!
+* Fragments group multiple elements returned from a component, without adding a DOM element around them.
 
 
 ##### Additional Links
 
 
-* [Master the JavaScript Interview: What is a Promise?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-promise-27fc71e772618)
+* [React docs on Fragments](https://reactjs.org/docs/fragments.html)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### How does prototypal inheritance differ from classical inheritance?
+### Create a function `pipe` that performs left-to-right function composition by returning a function that accepts one argument.
+
+```js
+const square = v => v * v
+const double = v => v * 2
+const addOne = v => v + 1
+const res = pipe(square, double, addOne)
+res(3) // 19; addOne(double(square(3)))
+```
 
 <details>
 <summary>View answer</summary>
 
-In the classical inheritance paradigm, object instances inherit their properties and functions from a class, which acts as a blueprint for the object. Object instances are typically created using a constructor and the `new` keyword.
+Gather all supplied arguments using the rest operator `...` and return a unary function that uses `Array.prototype.reduce()` to run the value through the series of functions before returning the final value.
 
-In the prototypal inheritance paradigm, object instances inherit directly from other objects and are typically created using factory functions or `Object.create()`.
+```js
+const pipe = (...fns) => x => fns.reduce((v, fn) => fn(v), x)
+```
 
 
 #### Good to hear
 
 
+* Function composition is the process of combining two or more functions to produce a new function.
 
 
 ##### Additional Links
 
 
-* [MDN docs for inheritance and the prototype chain](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain)
+* [What is function composition?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-function-composition-20dfb109a1a0)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the output of the following code?
-
-```js
-const a = [1, 2, 3]
-const b = [1, 2, 3]
-const c = "1,2,3"
-
-console.log(a == c)
-console.log(a == b)
-```
+### What is the event loop in Node.js?
 
 <details>
 <summary>View answer</summary>
 
-The first `console.log` outputs `true` because JavaScript's compiler performs type conversion and therefore it compares to strings by their value. On the other hand, the second `console.log` outputs `false` because Arrays are Objects and Objects are compared by reference.
+The event loop handles all async callbacks. Callbacks are queued in a loop, while other code runs, and will run one by one when the response for each one has been received.
 
 
 #### Good to hear
 
 
-* JavaScript performs automatic type conversion
-* Objects are compared by reference
-* Primitives are compared by value
+* The event loop allows Node.js to perform non-blocking I/O operations, despite the fact that JavaScript is single-threaded
 
 
 ##### Additional Links
 
 
-* [JavaScript Value vs Reference](https://medium.com/dailyjs/back-to-roots-javascript-value-vs-reference-8fb69d587a18)
+* [Node.js docs on event loop, timers and process.nextTick()](https://nodejs.org/en/docs/guides/event-loop-timers-and-nexttick/)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What does the following function return?
-
-```js
-function greet() {
-  return
-  {
-    message: "hello"
-  }
-}
-```
+### What is the only value not equal to itself in JavaScript?
 
 <details>
 <summary>View answer</summary>
 
-Because of JavaScript's automatic semicolon insertion (ASI), the compiler places a semicolon after `return` keyword and therefore it returns `undefined` without an error being thrown.
+`NaN` (Not-a-Number) is the only value not equal to itself when comparing with any of the comparison operators. `NaN` is often the result of meaningless math computations, so two `NaN` values make no sense to be considered equal.
 
 
 #### Good to hear
 
 
-* Automatic semicolon placement can lead to time-consuming bugs
+* The difference between `isNaN()` and `Number.isNaN()`
+* `const isNaN = x => x !== x`
 
 
 ##### Additional Links
 
 
-* [Automatic semicolon insertion in JavaScript](http://2ality.com/2011/05/semicolon-insertion.html)
+* [MDN docs for `NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Are semicolons required in JavaScript?
+### Contrast mutable and immutable values, and mutating vs non-mutating methods.
 
 <details>
 <summary>View answer</summary>
 
-Sometimes. Due to JavaScript's automatic semicolon insertion, the interpreter places semicolons after most statements. This means semicolons can be omitted in most cases.
-
-However, there are some cases where they are required. They are not required at the beginning of a block, but are if they follow a line and:
+The two terms can be contrasted as:
 
-1.  The line starts with `[`
+* Mutable: subject to change
+* Immutable: cannot change
 
-```js
-const previousLine = 3
-;[1, 2, previousLine].map(n => n * 2)
-```
+In JavaScript, objects are mutable while primitive values are immutable. This means operations performed on objects can change the original reference in some way, while operations performed on a primitive value cannot change the original value.
 
-2.  The line starts with `(`
+All `String.prototype` methods do not have an effect on the original string and return a new string. On the other hand, while some methods of `Array.prototype` do not mutate the original array reference and produce a fresh array, some cause mutations.
 
 ```js
-const previousLine = 3
-;(function() {
-  // ...
-})()
-```
+const myString = "hello!"
+myString.replace("!", "") // returns a new string, cannot mutate the original value
 
-In the above cases, the interpreter does not insert a semicolon after `3`, and therefore it will see the `3` as attempting object property access or being invoked as a function, which will throw errors.
+const originalArray = [1, 2, 3]
+originalArray.push(4) // mutates originalArray, now [1, 2, 3, 4]
+originalArray.concat(4) // returns a new array, does not mutate the original
+```
 
 
 #### Good to hear
 
 
-* Semicolons are usually optional in JavaScript but have edge cases where they are required.
-* If you don't use semicolons, tools like Prettier will insert semicolons for you in the places where they are required on save in a text editor to prevent errors.
+* List of mutating and non-mutating array methods
 
 
 ##### Additional Links
 
 
+* [Mutating vs non-mutating array methods](https://lorenstewart.me/2017/01/22/javascript-array-methods-mutating-vs-non-mutating/)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is short-circuit evaluation in JavaScript?
+### What is Big O Notation?
 
 <details>
 <summary>View answer</summary>
 
-Short-circuit evaluation involves logical operations evaluating from left-to-right and stopping early.
+Big O notation is used in Computer Science to describe the time complexity of an algorithm. The best algorithms will execute the fastest and have the simplest complexity.
 
-```js
-true || false
-```
+Algorithms don't always perform the same and may vary based on the data they are supplied. While in some cases they will execute quickly, in other cases they will execute slowly, even with the same number of elements to deal with.
 
-In the above sample using logical OR, JavaScript won't look at the second operand `false`, because the expression evaluates to `true` regardless. This is known as short-circuit evaluation.
+In these examples, the base time is 1 element = `1ms`.
 
-This also works for logical AND.
+##### O(1)
 
 ```js
-false && true
+arr[arr.length - 1]
 ```
 
-This means you can have an expression that throws an error if evaluated, and it won't cause issues.
+* 1000 elements = `1ms`
 
-```js
-true || nonexistentFunction()
-false && nonexistentFunction()
-```
+Constant time complexity. No matter how many elements the array has, it will theoretically take (excluding real-world variation) the same amount of time to execute.
 
-This remains true for multiple operations because of left-to-right evaluation.
+##### O(N)
 
 ```js
-true || nonexistentFunction() || window.nothing.wouldThrowError
-true || window.nothing.wouldThrowError
-true
+arr.filter(fn)
 ```
 
-A common use case for this behavior is setting default values. If the first operand is falsy the second operand will be evaluated.
+* 1000 elements = `1000ms`
 
-```js
-const options = {}
-const setting = options.setting || "default"
-setting // "default"
-```
+Linear time complexity. The execution time will increase linearly with the number of elements the array has. If the array has 1000 elements and the function takes 1ms to execute, 7000 elements will take 7ms to execute. This is because the function must iterate through all elements of the array before returning a result.
 
-Another common use case is only evaluating an expression if the first operand is truthy.
+##### O([1, N])
 
 ```js
-// Instead of:
-addEventListener("click", e => {
-  if (e.target.closest("button")) {
-    handleButtonClick(e)
-  }
-})
-
-// You can take advantage of short-circuit evaluation:
-addEventListener(
-  "click",
-  e => e.target.closest("button") && handleButtonClick(e)
-)
+arr.some(fn)
 ```
 
-In the above case, if `e.target` is not or does not contain an element matching the `"button"` selector, the function will not be called. This is because the first operand will be falsy, causing the second operand to not be evaluated.
-
-
-#### Good to hear
-
-
-* Logical operations do not produce a boolean unless the operand(s) evaluate to a boolean.
-
-
-##### Additional Links
-
-
-* [JavaScript: What is short-circuit evaluation?](https://codeburst.io/javascript-what-is-short-circuit-evaluation-ff22b2f5608c)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is the difference between synchronous and asynchronous code in JavaScript?
-
-<details>
-<summary>View answer</summary>
-
-Synchronous means each operation must wait for the previous one to complete.
-
-Asynchronous means an operation can occur while another operation is still being processed.
-
-In JavaScript, all code is synchronous due to the single-threaded nature of it. However, asynchronous operations not part of the program (such as `XMLHttpRequest` or `setTimeout`) are processed outside of the main thread because they are controlled by native code (browser APIs), but callbacks part of the program will still be executed synchronously.
-
+* 1000 elements = `1ms <= x <= 1000ms`
 
-#### Good to hear
+The execution time varies depending on the data supplied to the function, it may return very early or very late. The best case here is O(1) and the worst case is O(N).
 
+##### O(NlogN)
 
-* JavaScript has a concurrency model based on an "event loop".
-* Functions like `alert` block the main thread so that no user input is registered until the user closes it.
+```js
+arr.sort(fn)
+```
 
+* 1000 elements ~= `10000ms`
 
-##### Additional Links
+Browsers usually implement the quicksort algorithm for the `sort()` method and the average time complexity of quicksort is O(NlgN). This is very efficient for large collections.
 
+##### O(N^2)
 
+```js
+for (let i = 0; i < arr.length; i++) {
+  for (let j = 0; j < arr.length; j++) {
+    // ...
+  }
+}
+```
 
-</details>
+* 1000 elements = `1000000ms`
 
-<br>[⬆ Back to top](#table-of-contents)
+The execution time rises quadratically with the number of elements. Usually the result of nesting loops.
 
-### What does the following code evaluate to?
+##### O(N!)
 
 ```js
-typeof typeof 0
+const permutations = arr => {
+  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr
+  return arr.reduce(
+    (acc, item, i) =>
+      acc.concat(
+        permutations([...arr.slice(0, i), ...arr.slice(i + 1)]).map(val => [
+          item,
+          ...val
+        ])
+      ),
+    []
+  )
+}
 ```
 
-<details>
-<summary>View answer</summary>
-
-It evaluates to `"string"`.
+* 1000 elements = `Infinity` (practically) ms
 
-`typeof 0` evaluates to the string `"number"` and therefore `typeof "number"` evaluates to `"string"`.
+The execution time rises extremely fast with even just 1 addition to the array.
 
 
 #### Good to hear
 
 
+* Be wary of nesting loops as execution time increases exponentially.
 
 
 ##### Additional Links
 
 
-* [MDN docs for typeof](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/typeof)
+* [Big O Notation in JavaScript](https://medium.com/cesars-tech-insights/big-o-notation-javascript-25c79f50b19b)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are JavaScript data types?
+### What is a pure function?
 
 <details>
 <summary>View answer</summary>
 
-The latest ECMAScript standard defines seven data types, six of them being primitive: `Boolean`, `Null`, `Undefined`, `Number`, `String`, `Symbol` and one non-primitive data type: `Object`.
-
-
-#### Good to hear
-
-
-* Mention of newly added `Symbol` data type
-* `Array`, `Date` and `function` are all of type `object`
-* Functions in JavaScript are objects with the capability of being callable
-
-
-##### Additional Links
+A pure function is a function that satisfies these two conditions:
 
+* Given the same input, the function returns the same output.
+* The function doesn't cause side effects outside of the function's scope (i.e. mutate data outside the function or data supplied to the function).
 
-* [MDN docs for data types and data structures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures)
-* [Understanding Data Types in JavaScript](https://www.digitalocean.com/community/tutorials/understanding-data-types-in-javascript)
+Pure functions can mutate local data within the function as long as it satisfies the two conditions above.
 
-</details>
+##### Pure
 
-<br>[⬆ Back to top](#table-of-contents)
+```js
+const a = (x, y) => x + y
+const b = (arr, value) => arr.concat(value)
+const c = arr => [...arr].sort((a, b) => a - b)
+```
 
-### What are the differences between `var`, `let`, `const` and no keyword statements?
+##### Impure
 
-<details>
-<summary>View answer</summary>
+```js
+const a = (x, y) => x + y + Math.random()
+const b = (arr, value) => (arr.push(value), arr)
+const c = arr => arr.sort((a, b) => a - b)
+```
 
-##### No keyword
 
-When no keyword exists before a variable assignment, it is either assigning a global variable if one does not exist, or reassigns an already declared variable. In non-strict mode, if the variable has not yet been declared, it will assign the variable as a property of the global object (`window` in browsers). In strict mode, it will throw an error to prevent unwanted global variables from being created.
+#### Good to hear
 
-##### var
 
-`var` was the default statement to declare a variable until ES2015. It creates a function-scoped variable that can be reassigned and redeclared. However, due to its lack of block scoping, it can cause issues if the variable is being reused in a loop that contains an asynchronous callback because the variable will continue to exist outside of the block scope.
+* Pure functions are easier to reason about due to their reliability.
+* All functions should be pure unless explicitly causing a side effect (i.e. `setInnerHTML`).
+* If a function does not return a value, it is an indication that it is causing side effects.
 
-Below, by the time the the `setTimeout` callback executes, the loop has already finished and the `i` variable is `10`, so all ten callbacks reference the same variable available in the function scope.
 
-```js
-for (var i = 0; i < 10; i++) {
-  setTimeout(() => {
-    // logs `10` ten times
-    console.log(i)
-  })
-}
+##### Additional Links
 
-/* Solutions with `var` */
-for (var i = 0; i < 10; i++) {
-  // Passed as an argument will use the value as-is in
-  // that point in time
-  setTimeout(console.log, 0, i)
-}
-
-for (var i = 0; i < 10; i++) {
-  // Create a new function scope that will use the value
-  // as-is in that point in time
-  ;(i => {
-    setTimeout(() => {
-      console.log(i)
-    })
-  })(i)
-}
-```
-
-##### let
-
-`let` was introduced in ES2015 and is the new preferred way to declare variables that will be reassigned later. Trying to redeclare a variable again will throw an error. It is block-scoped so that using it in a loop will keep it scoped to the iteration.
-
-```js
-for (let i = 0; i < 10; i++) {
-  setTimeout(() => {
-    // logs 0, 1, 2, 3, ...
-    console.log(i)
-  })
-}
-```
-
-##### const
-
-`const` was introduced in ES2015 and is the new preferred default way to declare all variables if they won't be reassigned later, even for objects that will be mutated (as long as the reference to the object does not change). It is block-scoped and cannot be reassigned.
-
-```js
-const myObject = {}
-myObject.prop = "hello!" // No error
-myObject = "hello" // Error
-```
-
-
-#### Good to hear
-
-
-* All declarations are hoisted to the top of their scope.
-* However, with `let` and `const` there is a concept called the temporal dead zone (TDZ). While the declarations are still hoisted, there is a period between entering scope and being declared where they cannot be accessed.
-* Show a common issue with using `var` and how `let` can solve it, as well as a solution that keeps `var`.
-* `var` should be avoided whenever possible and prefer `const` as the default declaration statement for all variables unless they will be reassigned later, then use `let` if so.
-
-
-##### Additional Links
-
-
-* [`let` vs `const`](https://wesbos.com/let-vs-const/)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is a cross-site scripting attack (XSS) and how do you prevent it?
-
-<details>
-<summary>View answer</summary>
-
-XSS refers to client-side code injection where the attacker injects malicious scripts into a legitimate website or web application. This is often achieved when the application does not validate user input and freely injects dynamic HTML content.
-
-For example, a comment system will be at risk if it does not validate or escape user input. If the comment contains unescaped HTML, the comment can inject a `<script>` tag into the website that other users will execute against their knowledge.
-
-* The malicious script has access to cookies which are often used to store session tokens. If an attacker can obtain a user’s session cookie, they can impersonate the user.
-* The script can arbitrarily manipulate the DOM of the page the script is executing in, allowing the attacker to insert pieces of content that appear to be a real part of the website.
-* The script can use AJAX to send HTTP requests with arbitrary content to arbitrary destinations.
-
-
-#### Good to hear
-
-
-* On the client, using `textContent` instead of `innerHTML` prevents the browser from running the string through the HTML parser which would execute scripts in it.
-* On the server, escaping HTML tags will prevent the browser from parsing the user input as actual HTML and therefore won't execute the script.
-
-
-##### Additional Links
-
-
-* [Cross-Site Scripting Attack (XSS)](https://www.acunetix.com/websitesecurity/cross-site-scripting/)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is Big O Notation?
-
-<details>
-<summary>View answer</summary>
-
-Big O notation is used in Computer Science to describe the time complexity of an algorithm. The best algorithms will execute the fastest and have the simplest complexity.
-
-Algorithms don't always perform the same and may vary based on the data they are supplied. While in some cases they will execute quickly, in other cases they will execute slowly, even with the same number of elements to deal with.
-
-In these examples, the base time is 1 element = `1ms`.
-
-##### O(1)
-
-```js
-arr[arr.length - 1]
-```
-
-* 1000 elements = `1ms`
-
-Constant time complexity. No matter how many elements the array has, it will theoretically take (excluding real-world variation) the same amount of time to execute.
-
-##### O(N)
-
-```js
-arr.filter(fn)
-```
-
-* 1000 elements = `1000ms`
-
-Linear time complexity. The execution time will increase linearly with the number of elements the array has. If the array has 1000 elements and the function takes 1ms to execute, 7000 elements will take 7ms to execute. This is because the function must iterate through all elements of the array before returning a result.
-
-##### O([1, N])
-
-```js
-arr.some(fn)
-```
-
-* 1000 elements = `1ms <= x <= 1000ms`
-
-The execution time varies depending on the data supplied to the function, it may return very early or very late. The best case here is O(1) and the worst case is O(N).
-
-##### O(NlogN)
-
-```js
-arr.sort(fn)
-```
-
-* 1000 elements ~= `10000ms`
-
-Browsers usually implement the quicksort algorithm for the `sort()` method and the average time complexity of quicksort is O(NlgN). This is very efficient for large collections.
-
-##### O(N^2)
-
-```js
-for (let i = 0; i < arr.length; i++) {
-  for (let j = 0; j < arr.length; j++) {
-    // ...
-  }
-}
-```
-
-* 1000 elements = `1000000ms`
-
-The execution time rises quadratically with the number of elements. Usually the result of nesting loops.
-
-##### O(N!)
-
-```js
-const permutations = arr => {
-  if (arr.length <= 2) return arr.length === 2 ? [arr, [arr[1], arr[0]]] : arr
-  return arr.reduce(
-    (acc, item, i) =>
-      acc.concat(
-        permutations([...arr.slice(0, i), ...arr.slice(i + 1)]).map(val => [
-          item,
-          ...val
-        ])
-      ),
-    []
-  )
-}
-```
-
-* 1000 elements = `Infinity` (practically) ms
-
-The execution time rises extremely fast with even just 1 addition to the array.
-
-
-#### Good to hear
-
-
-* Be wary of nesting loops as execution time increases exponentially.
-
-
-##### Additional Links
-
-
-* [Big O Notation in JavaScript](https://medium.com/cesars-tech-insights/big-o-notation-javascript-25c79f50b19b)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### How can you avoid callback hells?
-
-```js
-getData(function(a) {
-  getMoreData(a, function(b) {
-    getMoreData(b, function(c) {
-      getMoreData(c, function(d) {
-        getMoreData(d, function(e) {
-          // ...
-        })
-      })
-    })
-  })
-})
-```
-
-<details>
-<summary>View answer</summary>
-
-Refactoring the functions to return promises and using `async/await` is usually the best option. Instead of supplying the functions with callbacks that cause deep nesting, they return a promise that can be `await`ed and will be resolved once the data has arrived, allowing the next line of code to be evaluated in a sync-like fashion.
-
-The above code can be restructured like so:
-
-```js
-async function asyncAwaitVersion() {
-  const a = await getData()
-  const b = await getMoreData(a)
-  const c = await getMoreData(b)
-  const d = await getMoreData(c)
-  const e = await getMoreData(d)
-  // ...
-}
-```
-
-There are lots of ways to solve the issue of callback hells:
-
-* Modularization: break callbacks into independent functions
-* Use a control flow library, like async
-* Use generators with Promises
-* Use async/await (from v7 on)
-
-
-#### Good to hear
-
-
-* As an efficient JavaScript developer, you have to avoid the constantly growing indentation level, produce clean and readable code and be able to handle complex flows.
-
-
-##### Additional Links
-
-
-* [Avoiding Callback Hell in Node.js](http://stackabuse.com/avoiding-callback-hell-in-node-js/)
-* [Asynchronous JavaScript: From Callback Hell to Async and Await](https://blog.hellojs.org/asynchronous-javascript-from-callback-hell-to-async-and-await-9b9ceb63c8e8)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### Which is the preferred option between callback refs and findDOMNode()?
-
-<details>
-<summary>View answer</summary>
-
-Callback refs are preferred over the `findDOMNode()` API, due to the fact that `findDOMNode()` prevents certain improvements in React in the future.
-
-```js
-// Legacy approach using findDOMNode()
-class MyComponent extends Component {
-  componentDidMount() {
-    findDOMNode(this).scrollIntoView()
-  }
-
-  render() {
-    return <div />
-  }
-}
-
-// Recommended approach using callback refs
-class MyComponent extends Component {
-  componentDidMount() {
-    this.node.scrollIntoView()
-  }
-
-  render() {
-    return <div ref={node => (this.node = node)} />
-  }
-}
-```
-
-
-#### Good to hear
-
-
-* Callback refs are preferred over `findDOMNode()`.
-
-
-##### Additional Links
-
-
-* [React docs on Refs and the DOM](https://reactjs.org/docs/refs-and-the-dom.html#exposing-dom-refs-to-parent-components)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is the `children` prop?
-
-<details>
-<summary>View answer</summary>
-
-`children` is part of the props object passed to components that allows components to be passed as data to other components, providing the ability to compose components cleanly. There are a number of methods available in the React API to work with this prop, such as `React.Children.map`, `React.Children.forEach`, `React.Children.count`, `React.Children.only` and `React.Children.toArray`. A simple usage example of the children prop is as follows:
-
-```js
-function GenericBox({ children }) {
-  return <div className="container">{children}</div>
-}
-
-function App() {
-  return (
-    <GenericBox>
-      <span>Hello</span> <span>World</span>
-    </GenericBox>
-  )
-}
-```
-
-
-#### Good to hear
-
-
-* Children is a prop that allows components to be passed as data to other components.
-* The React API provides methods to work with this prop.
-
-
-##### Additional Links
-
-
-* [React docs on Children](https://reactjs.org/docs/jsx-in-depth.html#children-in-jsx)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is a closure? Can you give a useful example of one?
-
-<details>
-<summary>View answer</summary>
-
-A closure is a function defined inside another function and has access to its lexical scope even when it is executing outside its lexical scope. The closure has access to variables in three scopes:
-
-* Variables declared in its own scope
-* Variables declared in the scope of the parent function
-* Variables declared in the global scope
-
-In JavaScript, all functions are closures because they have access to the outer scope, but most functions don't utilise the usefulness of closures: the persistence of state. Closures are also sometimes called stateful functions because of this.
-
-In addition, closures are the only way to store private data that can't be accessed from the outside in JavaScript. They are the key to the UMD (Universal Module Definition) pattern, which is frequently used in libraries that only expose a public API but keep the implementation details private, preventing name collisions with other libraries or the user's own code.
-
-
-#### Good to hear
-
-
-* Closures are useful because they let you associate data with a function that operates on that data.
-* A closure can substitute an object with only a single method.
-* Closures can be used to emulate private properties and methods.
-
-
-##### Additional Links
-
-
-* [MDN docs for closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures)
-* [What is a closure](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-closure-b2f0d2152b36)
-* [I never understood JavaScript closures](https://medium.com/dailyjs/i-never-understood-javascript-closures-9663703368e8)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is context?
-
-<details>
-<summary>View answer</summary>
-
-Context provides a way to pass data through the component tree without having to pass props down manually at every level. For example, authenticated user, locale preference, UI theme need to be accessed in the application by many components.
-
-```js
-const { Provider, Consumer } = React.createContext(defaultValue)
-```
-
-
-#### Good to hear
-
-
-* Context provides a way to pass data through a tree of React components, without having to manually pass props.
-* Context is designed to share data that is considered _global_ for a tree of React components.
-
-
-##### Additional Links
-
-
-* [React docs on Context](https://reactjs.org/docs/context.html)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is event-driven programming?
-
-<details>
-<summary>View answer</summary>
-
-Event-driven programming is a paradigm that involves building applications that send and receive events. When the program emits events, the program responds by running any callback functions that are registered to that event and context, passing in associated data to the function. With this pattern, events can be emitted into the wild without throwing errors even if no functions are subscribed to it.
-
-A common example of this is the pattern of elements listening to DOM events such as `click` and `mouseenter`, where a callback function is run when the event occurs.
-
-```js
-document.addEventListener("click", function(event) {
-  // This callback function is run when the user
-  // clicks on the document.
-})
-```
-
-Without the context of the DOM, the pattern may look like this:
-
-```js
-const hub = createEventHub()
-hub.on("message", function(data) {
-  console.log(`${data.username} said ${data.text}`)
-})
-hub.emit("message", {
-  username: "John",
-  text: "Hello?"
-})
-```
-
-With this implementation, `on` is the way to _subscribe_ to an event, while `emit` is the way to _publish_ the event.
-
-
-#### Good to hear
-
-
-* Follows a publish-subscribe pattern.
-* Responds to events that occur by running any callback functions subscribed to the event.
-* Show how to create a simple pub-sub implementation with JavaScript.
-
-
-##### Additional Links
-
-
-* [MDN docs on Events and Handlers](https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Overview_of_Events_and_Handlers)
-* [Understanding Node.js event-driven architecture](https://medium.freecodecamp.org/understanding-node-js-event-driven-architecture-223292fcbc2d)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What are fragments?
-
-<details>
-<summary>View answer</summary>
-
-Fragments allow a React component to return multiple elements without a wrapper, by grouping the children without adding extra elements to the DOM. Fragments offer better performance, lower memory usage, a cleaner DOM and can help in dealing with certain CSS mechanisms (e.g. tables, Flexbox and Grid).
-
-```js
-render() {
-  return (
-    <React.Fragment>
-      <ChildA />
-      <ChildB />
-      <ChildC />
-    </React.Fragment>
-  );
-}
-
-// Short syntax supported by Babel 7
-render() {
-  return (
-    <>
-      <ChildA />
-      <ChildB />
-      <ChildC />
-    </>
-  );
-}
-```
-
-
-#### Good to hear
-
-
-* Fragments group multiple elements returned from a component, without adding a DOM element around them.
-
-
-##### Additional Links
-
-
-* [React docs on Fragments](https://reactjs.org/docs/fragments.html)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is functional programming?
-
-<details>
-<summary>View answer</summary>
-
-Functional programming is a paradigm in which programs are built in a declarative manner using pure functions that avoid shared state and mutable data. Functions that always return the same value for the same input and don't produce side effects are the pillar of functional programming. Many programmers consider this to be the best approach to software development as it reduces bugs and cognitive load.
-
-
-#### Good to hear
-
-
-* Cleaner, more concise development experience
-* Simple function composition
-* Features of JavaScript that enable functional programming (`.map`, `.reduce` etc.)
-* JavaScript is multi-paradigm programming language (Object-Oriented Programming and Functional Programming live in harmony)
-
-
-##### Additional Links
-
-
-* [Javascript and Functional Programming: An Introduction](https://hackernoon.com/javascript-and-functional-programming-an-introduction-286aa625e26d)
-* [Master the JavaScript Interview: What is Functional Programming?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-functional-programming-7f218c68b3a0)
+
+* [Pure functions in JavaScript](http://www.nicoespeon.com/en/2015/01/pure-functions-javascript/)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Explain the differences between imperative and declarative programming.
+### What is recursion and when is it useful?
 
 <details>
 <summary>View answer</summary>
 
-These two types of programming can roughly be summarized as:
-
-* Imperative: **how** to achieve something
-* Declarative: **what** should be achieved
-
-A common example of declarative programming is CSS. The developer specifies CSS properties that describe what something should look like rather than how to achieve it. The "how" is abstracted away by the browser.
-
-On the other hand, imperative programming involves the steps required to achieve something. In JavaScript, the differences can be contrasted like so:
+Recursion is the repeated application of a process. In JavaScript, recursion involves functions that call themselves repeatedly until they reach a base condition. The base condition breaks out of the recursion loop because otherwise the function would call itself indefinitely. Recursion is very useful when working with data structures that contain nesting where the number of levels deep is unknown.
 
-##### Imperative
+For example, you may have a thread of comments returned from a database that exist in a flat array but need to be nested for display in the UI. Each comment is either a top-level comment (no parent) or is a reply to a parent comment. Comments can be a reply of a reply of a reply... we have no knowledge beforehand the number of levels deep a comment may be. This is where recursion can help.
 
 ```js
-const numbers = [1, 2, 3, 4, 5]
-const numbersDoubled = []
-for (let i = 0; i < numbers.length; i++) {
-  numbersDoubled[i] = numbers[i] * 2
-}
-```
-
-We manually loop over the numbers of the array and assign the new index as the number doubled.
+const nest = (items, id = null, link = "parent_id") =>
+  items
+    .filter(item => item[link] === id)
+    .map(item => ({ ...item, children: nest(items, item.id) }))
 
-##### Declarative
+const comments = [
+  { id: 1, parent_id: null, text: "First reply to post." },
+  { id: 2, parent_id: 1, text: "First reply to comment #1." },
+  { id: 3, parent_id: 1, text: "Second reply to comment #1." },
+  { id: 4, parent_id: 3, text: "First reply to comment #3." },
+  { id: 5, parent_id: 4, text: "First reply to comment #4." },
+  { id: 6, parent_id: null, text: "Second reply to post." }
+]
 
-```js
-const numbers = [1, 2, 3, 4, 5]
-const numbersDoubled = numbers.map(n => n * 2)
+nest(comments)
+/*
+[
+  { id: 1, parent_id: null, text: "First reply to post.", children: [...] },
+  { id: 6, parent_id: null, text: "Second reply to post.", children: [] }
+]
+*/
 ```
 
-We declare that the new array is mapped to a new one where each value is doubled.
+In the above example, the base condition is met if `filter()` returns an empty array. The chained `map()` won't invoke the callback function which contains the recursive call, thereby breaking the loop.
 
 
 #### Good to hear
 
 
-* Declarative programming often works with functions and expressions. Imperative programming frequently uses statements and relies on low-level features that cause mutations, while declarative programming has a strong focus on abstraction and purity.
-* Declarative programming is more terse and easier to process at a glance.
+* Recursion is useful when working with data structures containing an unknown number of nested structures.
+* Recursion must have a base condition to be met that breaks out of the loop or it will call itself indefinitely.
 
 
 ##### Additional Links
 
 
-* [Declarative vs Imperative Programming](https://codeburst.io/declarative-vs-imperative-programming-a8a7c93d9ad2)
+* [In plain English, what is recursion?](https://softwareengineering.stackexchange.com/questions/25052/in-plain-english-what-is-recursion)
 
 </details>
 
@@ -2606,181 +2484,126 @@ const memoize = fn => {
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### How do you ensure methods have the correct `this` context in React component classes?
+### What are refs in React? When should they be used?
 
 <details>
 <summary>View answer</summary>
 
-In JavaScript classes, the methods are not bound by default. This means that their `this` context can be changed (in the case of an event handler, to the element that is listening to the event) and will not refer to the component instance. To solve this, `Function.prototype.bind()` can be used to enforce the `this` context as the component instance.
-
-```js
-constructor(props) {
-  super(props);
-  this.handleClick = this.handleClick.bind(this);
-}
+Refs provide a way to access DOM nodes or React elements created in the render method. Refs should be used sparringly, but there are some good use cases for refs, such as:
 
-handleClick() {
-  // Perform some logic
-}
-```
+* Managing focus, text selection, or media playback.
+* Triggering imperative animations.
+* Integrating with third-party DOM libraries.
 
-* The `bind` approach can be verbose and requires defining a `constructor`, so the new public class fields syntax is generally preferred:
+Refs are created using `React.createRef()` method and attached to React elements via the `ref` attribute. In order to use refs throughout the component, assign the `ref` to the instance property within the constructor:
 
 ```js
-handleClick = () => {
-  console.log('this is:', this);
-}
+class MyComponent extends React.Component {
+  constructor(props) {
+    super(props)
+    this.myRef = React.createRef()
+  }
 
-render() {
-  return (
-    <button onClick={this.handleClick}>
-      Click me
-    </button>
-  );
+  render() {
+    return <div ref={this.myRef} />
+  }
 }
 ```
 
-* You can also use an inline arrow function, because lexical `this` (referring to the component instance) is preserved:
-
-```js
-<button onClick={e => this.handleClick(e)}>Click me</button>
-```
-
-Note that extra re-rendering can occur using this technique because a new function reference is created on render, which gets passed down to child components and breaks `shouldComponentUpdate` / `PureComponent` shallow equality checks to prevent unnecessary re-renders. In cases where performance is important, it is preferred to go with `bind` in the constructor, or the public class fields syntax approach, because the function reference remains constant.
+Refs can also be used in functional components with the help of closures.
 
 
 #### Good to hear
 
 
-* You can either bind methods to the component instance context in the constructor, use public class fields syntax, or use inline arrow functions.
+* Refs are used to return a reference to an element.
+* Refs shouldn't be overused.
+* You can create a ref using `React.createRef()` and attach to elements via the `ref` attribute.
 
 
 ##### Additional Links
 
 
-* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
-* [React docs on Passing Functions to Components](https://reactjs.org/docs/faq-functions.html#how-do-i-bind-a-function-to-a-component-instance)
+* [React docs on Refs and the DOM](https://reactjs.org/docs/refs-and-the-dom.html)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Contrast mutable and immutable values, and mutating vs non-mutating methods.
+### Explain the differences between imperative and declarative programming.
 
 <details>
 <summary>View answer</summary>
 
-The two terms can be contrasted as:
+These two types of programming can roughly be summarized as:
 
-* Mutable: subject to change
-* Immutable: cannot change
+* Imperative: **how** to achieve something
+* Declarative: **what** should be achieved
 
-In JavaScript, objects are mutable while primitive values are immutable. This means operations performed on objects can change the original reference in some way, while operations performed on a primitive value cannot change the original value.
+A common example of declarative programming is CSS. The developer specifies CSS properties that describe what something should look like rather than how to achieve it. The "how" is abstracted away by the browser.
 
-All `String.prototype` methods do not have an effect on the original string and return a new string. On the other hand, while some methods of `Array.prototype` do not mutate the original array reference and produce a fresh array, some cause mutations.
+On the other hand, imperative programming involves the steps required to achieve something. In JavaScript, the differences can be contrasted like so:
 
-```js
-const myString = "hello!"
-myString.replace("!", "") // returns a new string, cannot mutate the original value
+##### Imperative
 
-const originalArray = [1, 2, 3]
-originalArray.push(4) // mutates originalArray, now [1, 2, 3, 4]
-originalArray.concat(4) // returns a new array, does not mutate the original
+```js
+const numbers = [1, 2, 3, 4, 5]
+const numbersDoubled = []
+for (let i = 0; i < numbers.length; i++) {
+  numbersDoubled[i] = numbers[i] * 2
+}
 ```
 
+We manually loop over the numbers of the array and assign the new index as the number doubled.
 
-#### Good to hear
-
-
-* List of mutating and non-mutating array methods
-
-
-##### Additional Links
-
-
-* [Mutating vs non-mutating array methods](https://lorenstewart.me/2017/01/22/javascript-array-methods-mutating-vs-non-mutating/)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is the only value not equal to itself in JavaScript?
-
-<details>
-<summary>View answer</summary>
-
-`NaN` (Not-a-Number) is the only value not equal to itself when comparing with any of the comparison operators. `NaN` is often the result of meaningless math computations, so two `NaN` values make no sense to be considered equal.
-
-
-#### Good to hear
-
-
-* The difference between `isNaN()` and `Number.isNaN()`
-* `const isNaN = x => x !== x`
-
-
-##### Additional Links
-
-
-* [MDN docs for `NaN`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is the event loop in Node.js?
+##### Declarative
 
-<details>
-<summary>View answer</summary>
+```js
+const numbers = [1, 2, 3, 4, 5]
+const numbersDoubled = numbers.map(n => n * 2)
+```
 
-The event loop handles all async callbacks. Callbacks are queued in a loop, while other code runs, and will run one by one when the response for each one has been received.
+We declare that the new array is mapped to a new one where each value is doubled.
 
 
 #### Good to hear
 
 
-* The event loop allows Node.js to perform non-blocking I/O operations, despite the fact that JavaScript is single-threaded
+* Declarative programming often works with functions and expressions. Imperative programming frequently uses statements and relies on low-level features that cause mutations, while declarative programming has a strong focus on abstraction and purity.
+* Declarative programming is more terse and easier to process at a glance.
 
 
 ##### Additional Links
 
 
-* [Node.js docs on event loop, timers and process.nextTick()](https://nodejs.org/en/docs/guides/event-loop-timers-and-nexttick/)
+* [Declarative vs Imperative Programming](https://codeburst.io/declarative-vs-imperative-programming-a8a7c93d9ad2)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Create a function `pipe` that performs left-to-right function composition by returning a function that accepts one argument.
-
-```js
-const square = v => v * v
-const double = v => v * 2
-const addOne = v => v + 1
-const res = pipe(square, double, addOne)
-res(3) // 19; addOne(double(square(3)))
-```
+### What is functional programming?
 
 <details>
 <summary>View answer</summary>
 
-Gather all supplied arguments using the rest operator `...` and return a unary function that uses `Array.prototype.reduce()` to run the value through the series of functions before returning the final value.
-
-```js
-const pipe = (...fns) => x => fns.reduce((v, fn) => fn(v), x)
-```
+Functional programming is a paradigm in which programs are built in a declarative manner using pure functions that avoid shared state and mutable data. Functions that always return the same value for the same input and don't produce side effects are the pillar of functional programming. Many programmers consider this to be the best approach to software development as it reduces bugs and cognitive load.
 
 
 #### Good to hear
 
 
-* Function composition is the process of combining two or more functions to produce a new function.
+* Cleaner, more concise development experience
+* Simple function composition
+* Features of JavaScript that enable functional programming (`.map`, `.reduce` etc.)
+* JavaScript is multi-paradigm programming language (Object-Oriented Programming and Functional Programming live in harmony)
 
 
 ##### Additional Links
 
 
-* [What is function composition?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-function-composition-20dfb109a1a0)
+* [Javascript and Functional Programming: An Introduction](https://hackernoon.com/javascript-and-functional-programming-an-introduction-286aa625e26d)
+* [Master the JavaScript Interview: What is Functional Programming?](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-functional-programming-7f218c68b3a0)
 
 </details>
 
@@ -2814,145 +2637,79 @@ The first argument (`child`) is any renderable React child, such as an element,
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is a pure function?
-
-<details>
-<summary>View answer</summary>
-
-A pure function is a function that satisfies these two conditions:
-
-* Given the same input, the function returns the same output.
-* The function doesn't cause side effects outside of the function's scope (i.e. mutate data outside the function or data supplied to the function).
-
-Pure functions can mutate local data within the function as long as it satisfies the two conditions above.
-
-##### Pure
-
-```js
-const a = (x, y) => x + y
-const b = (arr, value) => arr.concat(value)
-const c = arr => [...arr].sort((a, b) => a - b)
-```
-
-##### Impure
-
-```js
-const a = (x, y) => x + y + Math.random()
-const b = (arr, value) => (arr.push(value), arr)
-const c = arr => arr.sort((a, b) => a - b)
-```
-
-
-#### Good to hear
-
-
-* Pure functions are easier to reason about due to their reliability.
-* All functions should be pure unless explicitly causing a side effect (i.e. `setInnerHTML`).
-* If a function does not return a value, it is an indication that it is causing side effects.
-
-
-##### Additional Links
-
-
-* [Pure functions in JavaScript](http://www.nicoespeon.com/en/2015/01/pure-functions-javascript/)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is recursion and when is it useful?
+### What is event-driven programming?
 
 <details>
 <summary>View answer</summary>
 
-Recursion is the repeated application of a process. In JavaScript, recursion involves functions that call themselves repeatedly until they reach a base condition. The base condition breaks out of the recursion loop because otherwise the function would call itself indefinitely. Recursion is very useful when working with data structures that contain nesting where the number of levels deep is unknown.
+Event-driven programming is a paradigm that involves building applications that send and receive events. When the program emits events, the program responds by running any callback functions that are registered to that event and context, passing in associated data to the function. With this pattern, events can be emitted into the wild without throwing errors even if no functions are subscribed to it.
 
-For example, you may have a thread of comments returned from a database that exist in a flat array but need to be nested for display in the UI. Each comment is either a top-level comment (no parent) or is a reply to a parent comment. Comments can be a reply of a reply of a reply... we have no knowledge beforehand the number of levels deep a comment may be. This is where recursion can help.
+A common example of this is the pattern of elements listening to DOM events such as `click` and `mouseenter`, where a callback function is run when the event occurs.
 
 ```js
-const nest = (items, id = null, link = "parent_id") =>
-  items
-    .filter(item => item[link] === id)
-    .map(item => ({ ...item, children: nest(items, item.id) }))
+document.addEventListener("click", function(event) {
+  // This callback function is run when the user
+  // clicks on the document.
+})
+```
 
-const comments = [
-  { id: 1, parent_id: null, text: "First reply to post." },
-  { id: 2, parent_id: 1, text: "First reply to comment #1." },
-  { id: 3, parent_id: 1, text: "Second reply to comment #1." },
-  { id: 4, parent_id: 3, text: "First reply to comment #3." },
-  { id: 5, parent_id: 4, text: "First reply to comment #4." },
-  { id: 6, parent_id: null, text: "Second reply to post." }
-]
+Without the context of the DOM, the pattern may look like this:
 
-nest(comments)
-/*
-[
-  { id: 1, parent_id: null, text: "First reply to post.", children: [...] },
-  { id: 6, parent_id: null, text: "Second reply to post.", children: [] }
-]
-*/
+```js
+const hub = createEventHub()
+hub.on("message", function(data) {
+  console.log(`${data.username} said ${data.text}`)
+})
+hub.emit("message", {
+  username: "John",
+  text: "Hello?"
+})
 ```
 
-In the above example, the base condition is met if `filter()` returns an empty array. The chained `map()` won't invoke the callback function which contains the recursive call, thereby breaking the loop.
+With this implementation, `on` is the way to _subscribe_ to an event, while `emit` is the way to _publish_ the event.
 
 
 #### Good to hear
 
 
-* Recursion is useful when working with data structures containing an unknown number of nested structures.
-* Recursion must have a base condition to be met that breaks out of the loop or it will call itself indefinitely.
+* Follows a publish-subscribe pattern.
+* Responds to events that occur by running any callback functions subscribed to the event.
+* Show how to create a simple pub-sub implementation with JavaScript.
 
 
 ##### Additional Links
 
 
-* [In plain English, what is recursion?](https://softwareengineering.stackexchange.com/questions/25052/in-plain-english-what-is-recursion)
+* [MDN docs on Events and Handlers](https://developer.mozilla.org/en-US/docs/Web/Guide/Events/Overview_of_Events_and_Handlers)
+* [Understanding Node.js event-driven architecture](https://medium.freecodecamp.org/understanding-node-js-event-driven-architecture-223292fcbc2d)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are refs in React? When should they be used?
+### What is context?
 
 <details>
 <summary>View answer</summary>
 
-Refs provide a way to access DOM nodes or React elements created in the render method. Refs should be used sparringly, but there are some good use cases for refs, such as:
-
-* Managing focus, text selection, or media playback.
-* Triggering imperative animations.
-* Integrating with third-party DOM libraries.
-
-Refs are created using `React.createRef()` method and attached to React elements via the `ref` attribute. In order to use refs throughout the component, assign the `ref` to the instance property within the constructor:
+Context provides a way to pass data through the component tree without having to pass props down manually at every level. For example, authenticated user, locale preference, UI theme need to be accessed in the application by many components.
 
 ```js
-class MyComponent extends React.Component {
-  constructor(props) {
-    super(props)
-    this.myRef = React.createRef()
-  }
-
-  render() {
-    return <div ref={this.myRef} />
-  }
-}
+const { Provider, Consumer } = React.createContext(defaultValue)
 ```
 
-Refs can also be used in functional components with the help of closures.
-
 
 #### Good to hear
 
 
-* Refs are used to return a reference to an element.
-* Refs shouldn't be overused.
-* You can create a ref using `React.createRef()` and attach to elements via the `ref` attribute.
+* Context provides a way to pass data through a tree of React components, without having to manually pass props.
+* Context is designed to share data that is considered _global_ for a tree of React components.
 
 
 ##### Additional Links
 
 
-* [React docs on Refs and the DOM](https://reactjs.org/docs/refs-and-the-dom.html)
+* [React docs on Context](https://reactjs.org/docs/context.html)
 
 </details>
 
@@ -2996,6 +2753,41 @@ Array.push(arr, 4)
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What is a closure? Can you give a useful example of one?
+
+<details>
+<summary>View answer</summary>
+
+A closure is a function defined inside another function and has access to its lexical scope even when it is executing outside its lexical scope. The closure has access to variables in three scopes:
+
+* Variables declared in its own scope
+* Variables declared in the scope of the parent function
+* Variables declared in the global scope
+
+In JavaScript, all functions are closures because they have access to the outer scope, but most functions don't utilise the usefulness of closures: the persistence of state. Closures are also sometimes called stateful functions because of this.
+
+In addition, closures are the only way to store private data that can't be accessed from the outside in JavaScript. They are the key to the UMD (Universal Module Definition) pattern, which is frequently used in libraries that only expose a public API but keep the implementation details private, preventing name collisions with other libraries or the user's own code.
+
+
+#### Good to hear
+
+
+* Closures are useful because they let you associate data with a function that operates on that data.
+* A closure can substitute an object with only a single method.
+* Closures can be used to emulate private properties and methods.
+
+
+##### Additional Links
+
+
+* [MDN docs for closures](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Closures)
+* [What is a closure](https://medium.com/javascript-scene/master-the-javascript-interview-what-is-a-closure-b2f0d2152b36)
+* [I never understood JavaScript closures](https://medium.com/dailyjs/i-never-understood-javascript-closures-9663703368e8)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is the `this` keyword and how does it work?
 
 <details>
@@ -3107,6 +2899,91 @@ obj.doubleArr() // Uncaught TypeError: this.double is not a function
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What is the `children` prop?
+
+<details>
+<summary>View answer</summary>
+
+`children` is part of the props object passed to components that allows components to be passed as data to other components, providing the ability to compose components cleanly. There are a number of methods available in the React API to work with this prop, such as `React.Children.map`, `React.Children.forEach`, `React.Children.count`, `React.Children.only` and `React.Children.toArray`. A simple usage example of the children prop is as follows:
+
+```js
+function GenericBox({ children }) {
+  return <div className="container">{children}</div>
+}
+
+function App() {
+  return (
+    <GenericBox>
+      <span>Hello</span> <span>World</span>
+    </GenericBox>
+  )
+}
+```
+
+
+#### Good to hear
+
+
+* Children is a prop that allows components to be passed as data to other components.
+* The React API provides methods to work with this prop.
+
+
+##### Additional Links
+
+
+* [React docs on Children](https://reactjs.org/docs/jsx-in-depth.html#children-in-jsx)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Which is the preferred option between callback refs and findDOMNode()?
+
+<details>
+<summary>View answer</summary>
+
+Callback refs are preferred over the `findDOMNode()` API, due to the fact that `findDOMNode()` prevents certain improvements in React in the future.
+
+```js
+// Legacy approach using findDOMNode()
+class MyComponent extends Component {
+  componentDidMount() {
+    findDOMNode(this).scrollIntoView()
+  }
+
+  render() {
+    return <div />
+  }
+}
+
+// Recommended approach using callback refs
+class MyComponent extends Component {
+  componentDidMount() {
+    this.node.scrollIntoView()
+  }
+
+  render() {
+    return <div ref={node => (this.node = node)} />
+  }
+}
+```
+
+
+#### Good to hear
+
+
+* Callback refs are preferred over `findDOMNode()`.
+
+
+##### Additional Links
+
+
+* [React docs on Refs and the DOM](https://reactjs.org/docs/refs-and-the-dom.html#exposing-dom-refs-to-parent-components)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 ### What is the purpose of JavaScript UI libraries/frameworks like React, Vue, Angular, Hyperapp, etc?
 
 <details>
@@ -3139,28 +3016,86 @@ When working with DOM manipulation libraries like jQuery, the data of an applica
 <details>
 <summary>View answer</summary>
 
-Including `'use strict'` at the beginning of your JavaScript source file enables strict mode, which enforces more strict parsing and error handling of JavaScript code. It is considered a good practice and offers a lot of benefits, such as:
+Including `'use strict'` at the beginning of your JavaScript source file enables strict mode, which enforces more strict parsing and error handling of JavaScript code. It is considered a good practice and offers a lot of benefits, such as:
+
+* Easier debugging due to eliminating silent errors.
+* Disallows variable redefinition.
+* Prevents accidental global variables.
+* Oftentimes provides increased performance over identical code that is not running in strict mode.
+* Simplifies `eval()` and `arguments`.
+* Helps make JavaScript more secure.
+
+
+#### Good to hear
+
+
+* Eliminates `this` coercion, throwing an error when `this` references a value of `null` or `undefined`.
+* Throws an error on invalid usage of `delete`.
+* Prohibits some syntax likely to be defined in future versions of ECMAScript
+
+
+##### Additional Links
+
+
+* [MDN docs for strict mode](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### How can you avoid callback hells?
+
+```js
+getData(function(a) {
+  getMoreData(a, function(b) {
+    getMoreData(b, function(c) {
+      getMoreData(c, function(d) {
+        getMoreData(d, function(e) {
+          // ...
+        })
+      })
+    })
+  })
+})
+```
+
+<details>
+<summary>View answer</summary>
+
+Refactoring the functions to return promises and using `async/await` is usually the best option. Instead of supplying the functions with callbacks that cause deep nesting, they return a promise that can be `await`ed and will be resolved once the data has arrived, allowing the next line of code to be evaluated in a sync-like fashion.
+
+The above code can be restructured like so:
+
+```js
+async function asyncAwaitVersion() {
+  const a = await getData()
+  const b = await getMoreData(a)
+  const c = await getMoreData(b)
+  const d = await getMoreData(c)
+  const e = await getMoreData(d)
+  // ...
+}
+```
+
+There are lots of ways to solve the issue of callback hells:
 
-* Easier debugging due to eliminating silent errors.
-* Disallows variable redefinition.
-* Prevents accidental global variables.
-* Oftentimes provides increased performance over identical code that is not running in strict mode.
-* Simplifies `eval()` and `arguments`.
-* Helps make JavaScript more secure.
+* Modularization: break callbacks into independent functions
+* Use a control flow library, like async
+* Use generators with Promises
+* Use async/await (from v7 on)
 
 
 #### Good to hear
 
 
-* Eliminates `this` coercion, throwing an error when `this` references a value of `null` or `undefined`.
-* Throws an error on invalid usage of `delete`.
-* Prohibits some syntax likely to be defined in future versions of ECMAScript
+* As an efficient JavaScript developer, you have to avoid the constantly growing indentation level, produce clean and readable code and be able to handle complex flows.
 
 
 ##### Additional Links
 
 
-* [MDN docs for strict mode](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Strict_mode)
+* [Avoiding Callback Hell in Node.js](http://stackabuse.com/avoiding-callback-hell-in-node-js/)
+* [Asynchronous JavaScript: From Callback Hell to Async and Await](https://blog.hellojs.org/asynchronous-javascript-from-callback-hell-to-async-and-await-9b9ceb63c8e8)
 
 </details>
 
@@ -3227,91 +3162,87 @@ Once the changes between the old VDOM and new VDOM have been calculated by the d
 
 <br>[⬆ Back to top](#table-of-contents)
 
-
-## React
-### What is the difference between an element and a component in React?
+### How do you ensure methods have the correct `this` context in React component classes?
 
 <details>
 <summary>View answer</summary>
 
-An element is a plain JavaScript object that represents a DOM node or component. Elements are pure and never mutated, and are cheap to create.
-
-A component is a function or class. Components can have state and take props as input and return an element tree as output (although they can represent generic containers or wrappers and don't necessarily have to emit DOM). Components can initiate side effects in lifecycle methods (e.g. AJAX requests, DOM mutations, interfacing with 3rd party libraries) and may be expensive to create.
+In JavaScript classes, the methods are not bound by default. This means that their `this` context can be changed (in the case of an event handler, to the element that is listening to the event) and will not refer to the component instance. To solve this, `Function.prototype.bind()` can be used to enforce the `this` context as the component instance.
 
 ```js
-const Component = () => "Hello"
-const componentElement = <Component />
-const domNodeElement = <div />
-```
-
-
-#### Good to hear
-
-
-* Elements are immutable, plain objects that describe the DOM nodes or components you want to render.
-* Components can be either classes or functions, that take props as an input and return an element tree as the output.
-
-
-##### Additional Links
+constructor(props) {
+  super(props);
+  this.handleClick = this.handleClick.bind(this);
+}
 
+handleClick() {
+  // Perform some logic
+}
+```
 
-* [React docs on Rendering Elements](https://reactjs.org/docs/rendering-elements.html)
-* [React docs on Components and Props](https://reactjs.org/docs/components-and-props.html)
+* The `bind` approach can be verbose and requires defining a `constructor`, so the new public class fields syntax is generally preferred:
 
-</details>
+```js
+handleClick = () => {
+  console.log('this is:', this);
+}
 
-<br>[⬆ Back to top](#table-of-contents)
+render() {
+  return (
+    <button onClick={this.handleClick}>
+      Click me
+    </button>
+  );
+}
+```
 
-### What does lifting state up in React mean?
+* You can also use an inline arrow function, because lexical `this` (referring to the component instance) is preserved:
 
-<details>
-<summary>View answer</summary>
+```js
+<button onClick={e => this.handleClick(e)}>Click me</button>
+```
 
-When several components need to share the same data, then it is recommended to lift the shared state up to their closest common ancestor. For example, if two child components share the same data, it is recommended to move the shared state to parent instead of maintaining the local state in both child components.
+Note that extra re-rendering can occur using this technique because a new function reference is created on render, which gets passed down to child components and breaks `shouldComponentUpdate` / `PureComponent` shallow equality checks to prevent unnecessary re-renders. In cases where performance is important, it is preferred to go with `bind` in the constructor, or the public class fields syntax approach, because the function reference remains constant.
 
 
 #### Good to hear
 
 
+* You can either bind methods to the component instance context in the constructor, use public class fields syntax, or use inline arrow functions.
 
 
 ##### Additional Links
 
 
+* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
+* [React docs on Passing Functions to Components](https://reactjs.org/docs/faq-functions.html#how-do-i-bind-a-function-to-a-component-instance)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### How do you write comments inside a JSX tree in React?
+
+## React
+### What is a stateless component?
 
 <details>
 <summary>View answer</summary>
 
-Comments must be wrapped inside curly braces `{}` and use the `/* */` syntax.
-
-```jsx
-const tree = (
-  <div>
-    {/* Comment */}
-    <p>Text</p>
-  </div>
-)
-```
-
-<!-- tags: (react) -->
-
-<!-- expertise: (0) -->
+A stateless component is a component whose behavior does not depend on its state. Stateless components can be either functional or class components. Stateless functional components are easier to maintain and test since they are guaranteed to produce the same output given the same props. Stateless functional components should be preferred when lifecycle hooks don't need to be used.
 
 
 #### Good to hear
 
 
+* Stateless components are independent of their state.
+* Stateless components can be either class or functional components.
+* Stateless functional components avoid the `this` keyword altogether.
 
 
 ##### Additional Links
 
 
+* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
 
 </details>
 
@@ -3361,56 +3292,89 @@ function App() {
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is a stateless component?
+### How do you write comments inside a JSX tree in React?
 
 <details>
 <summary>View answer</summary>
 
-A stateless component is a component whose behavior does not depend on its state. Stateless components can be either functional or class components. Stateless functional components are easier to maintain and test since they are guaranteed to produce the same output given the same props. Stateless functional components should be preferred when lifecycle hooks don't need to be used.
+Comments must be wrapped inside curly braces `{}` and use the `/* */` syntax.
+
+```jsx
+const tree = (
+  <div>
+    {/* Comment */}
+    <p>Text</p>
+  </div>
+)
+```
+
+<!-- tags: (react) -->
+
+<!-- expertise: (0) -->
 
 
 #### Good to hear
 
 
-* Stateless components are independent of their state.
-* Stateless components can be either class or functional components.
-* Stateless functional components avoid the `this` keyword altogether.
 
 
 ##### Additional Links
 
 
-* [React docs on State and Lifecycle](https://reactjs.org/docs/state-and-lifecycle.html)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the purpose of callback function as an argument of `setState`?
+### What is the difference between an element and a component in React?
 
 <details>
 <summary>View answer</summary>
 
-The callback function is invoked when `setState` has finished and the component gets rendered. Since `setState` is asynchronous, the callback function is used for any post action.
+An element is a plain JavaScript object that represents a DOM node or component. Elements are pure and never mutated, and are cheap to create.
+
+A component is a function or class. Components can have state and take props as input and return an element tree as output (although they can represent generic containers or wrappers and don't necessarily have to emit DOM). Components can initiate side effects in lifecycle methods (e.g. AJAX requests, DOM mutations, interfacing with 3rd party libraries) and may be expensive to create.
 
 ```js
-setState({ name: "sudheer" }, () => {
-  console.log("The name has updated and component re-rendered")
-})
+const Component = () => "Hello"
+const componentElement = <Component />
+const domNodeElement = <div />
 ```
 
 
 #### Good to hear
 
 
-* The callback function is invoked after `setState` finishes and is used for any post action.
-* It is recommended to use lifecycle method rather this callback function.
+* Elements are immutable, plain objects that describe the DOM nodes or components you want to render.
+* Components can be either classes or functions, that take props as an input and return an element tree as the output.
+
+
+##### Additional Links
+
+
+* [React docs on Rendering Elements](https://reactjs.org/docs/rendering-elements.html)
+* [React docs on Components and Props](https://reactjs.org/docs/components-and-props.html)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What does lifting state up in React mean?
+
+<details>
+<summary>View answer</summary>
+
+When several components need to share the same data, then it is recommended to lift the shared state up to their closest common ancestor. For example, if two child components share the same data, it is recommended to move the shared state to parent instead of maintaining the local state in both child components.
+
+
+#### Good to hear
+
+
 
 
 ##### Additional Links
 
 
-* [React docs on `setState`](https://reactjs.org/docs/react-component.html#setstate)
 
 </details>
 
@@ -3456,6 +3420,96 @@ However, `class` _can_ be used as a prop without problems, as seen in other libr
 
 
 
+##### Additional Links
+
+
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### How do you pass an argument to an event handler or callback?
+
+<details>
+<summary>View answer</summary>
+
+You can use an arrow function to wrap around an event handler and pass arguments, which is equivalent to calling `bind`:
+
+```js
+<button onClick={() => this.handleClick(id)} />
+<button onClick={this.handleClick.bind(this, id)} />
+```
+
+
+#### Good to hear
+
+
+
+
+##### Additional Links
+
+
+* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What is the purpose of callback function as an argument of `setState`?
+
+<details>
+<summary>View answer</summary>
+
+The callback function is invoked when `setState` has finished and the component gets rendered. Since `setState` is asynchronous, the callback function is used for any post action.
+
+```js
+setState({ name: "sudheer" }, () => {
+  console.log("The name has updated and component re-rendered")
+})
+```
+
+
+#### Good to hear
+
+
+* The callback function is invoked after `setState` finishes and is used for any post action.
+* It is recommended to use lifecycle method rather this callback function.
+
+
+##### Additional Links
+
+
+* [React docs on `setState`](https://reactjs.org/docs/react-component.html#setstate)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are the different phases of the component lifecycle in React?
+
+<details>
+<summary>View answer</summary>
+
+There are four different phases of component’s lifecycle:
+
+**Initialization**: In this phase, the component prepares setting up the initial state and default props.
+
+**Mounting**: The react component is ready to mount to the DOM. This phase covers the `getDerivedStateFromProps` and `componentDidMount` lifecycle methods.
+
+**Updating**: In this phase, the component gets updated in two ways, sending the new props and updating the state. This phase covers the `getDerivedStateFromProps`, `shouldComponentUpdate`, `getSnapshotBeforeUpdate` and `componentDidUpdate` lifecycle methods.
+
+**Unmounting**: In this last phase, the component is not needed and gets unmounted from the browser DOM. This phase includes the `componentWillUnmount` lifecycle method.
+
+**Error Handling**: In this phase, the component is called whenever there's an error during rendering, in a lifecycle method, or in the constructor for any child component. This phase includes the `componentDidCatch` lifecycle method.
+
+<img alt="lifecycle phases" src="https://pbs.twimg.com/media/DZ-97vzW4AAbcZj.jpg:large" style="width: 100%"/>
+
+
+#### Good to hear
+
+
+
+
 ##### Additional Links
 
 
@@ -3569,38 +3623,6 @@ function App({ messages, isVisible }) {
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is a key? What are the benefits of using it in lists?
-
-<details>
-<summary>View answer</summary>
-
-Keys are a special string attribute that helps React identify which items have been changed, added or removed. They are used when rendering array elements to give them a stable identity. Each element's key must be unique (e.g. IDs from the data or indexes as a last resort).
-
-```js
-const todoItems = todos.map(todo => <li key={todo.id}>{todo.text}</li>)
-```
-
-* Using indexes as keys is not recommended if the order of items may change, as it might negatively impact performance and may cause issues with component state.
-* If you extract list items as a separate component then apply keys on the list component instead of the `<li>` tag.
-
-
-#### Good to hear
-
-
-* Keys give elements in a collection a stable identity and help React identify changes.
-* You should avoid using indexes as keys if the order of items may change.
-* You should lift the key up to the component, instead of the `<li>` element, if you extract list items as components.
-
-
-##### Additional Links
-
-
-* [React docs on Lists and Keys](https://reactjs.org/docs/lists-and-keys.html)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
 ### What are the lifecycle methods in React?
 
 <details>
@@ -3634,61 +3656,33 @@ const todoItems = todos.map(todo => <li key={todo.id}>{todo.text}</li>)
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are the different phases of the component lifecycle in React?
-
-<details>
-<summary>View answer</summary>
-
-There are four different phases of component’s lifecycle:
-
-**Initialization**: In this phase, the component prepares setting up the initial state and default props.
-
-**Mounting**: The react component is ready to mount to the DOM. This phase covers the `getDerivedStateFromProps` and `componentDidMount` lifecycle methods.
-
-**Updating**: In this phase, the component gets updated in two ways, sending the new props and updating the state. This phase covers the `getDerivedStateFromProps`, `shouldComponentUpdate`, `getSnapshotBeforeUpdate` and `componentDidUpdate` lifecycle methods.
-
-**Unmounting**: In this last phase, the component is not needed and gets unmounted from the browser DOM. This phase includes the `componentWillUnmount` lifecycle method.
-
-**Error Handling**: In this phase, the component is called whenever there's an error during rendering, in a lifecycle method, or in the constructor for any child component. This phase includes the `componentDidCatch` lifecycle method.
-
-<img alt="lifecycle phases" src="https://pbs.twimg.com/media/DZ-97vzW4AAbcZj.jpg:large" style="width: 100%"/>
-
-
-#### Good to hear
-
-
-
-
-##### Additional Links
-
-
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### How do you pass an argument to an event handler or callback?
+### What is a key? What are the benefits of using it in lists?
 
 <details>
 <summary>View answer</summary>
 
-You can use an arrow function to wrap around an event handler and pass arguments, which is equivalent to calling `bind`:
+Keys are a special string attribute that helps React identify which items have been changed, added or removed. They are used when rendering array elements to give them a stable identity. Each element's key must be unique (e.g. IDs from the data or indexes as a last resort).
 
 ```js
-<button onClick={() => this.handleClick(id)} />
-<button onClick={this.handleClick.bind(this, id)} />
+const todoItems = todos.map(todo => <li key={todo.id}>{todo.text}</li>)
 ```
 
+* Using indexes as keys is not recommended if the order of items may change, as it might negatively impact performance and may cause issues with component state.
+* If you extract list items as a separate component then apply keys on the list component instead of the `<li>` tag.
+
 
 #### Good to hear
 
 
+* Keys give elements in a collection a stable identity and help React identify changes.
+* You should avoid using indexes as keys if the order of items may change.
+* You should lift the key up to the component, instead of the `<li>` element, if you extract list items as components.
 
 
 ##### Additional Links
 
 
-* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
+* [React docs on Lists and Keys](https://reactjs.org/docs/lists-and-keys.html)
 
 </details>
 
@@ -3737,119 +3731,6 @@ class MyComponent extends Component {
 
 * [React docs on Refs and the DOM](https://reactjs.org/docs/refs-and-the-dom.html#exposing-dom-refs-to-parent-components)
 
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is the `children` prop?
-
-<details>
-<summary>View answer</summary>
-
-`children` is part of the props object passed to components that allows components to be passed as data to other components, providing the ability to compose components cleanly. There are a number of methods available in the React API to work with this prop, such as `React.Children.map`, `React.Children.forEach`, `React.Children.count`, `React.Children.only` and `React.Children.toArray`. A simple usage example of the children prop is as follows:
-
-```js
-function GenericBox({ children }) {
-  return <div className="container">{children}</div>
-}
-
-function App() {
-  return (
-    <GenericBox>
-      <span>Hello</span> <span>World</span>
-    </GenericBox>
-  )
-}
-```
-
-
-#### Good to hear
-
-
-* Children is a prop that allows components to be passed as data to other components.
-* The React API provides methods to work with this prop.
-
-
-##### Additional Links
-
-
-* [React docs on Children](https://reactjs.org/docs/jsx-in-depth.html#children-in-jsx)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What is context?
-
-<details>
-<summary>View answer</summary>
-
-Context provides a way to pass data through the component tree without having to pass props down manually at every level. For example, authenticated user, locale preference, UI theme need to be accessed in the application by many components.
-
-```js
-const { Provider, Consumer } = React.createContext(defaultValue)
-```
-
-
-#### Good to hear
-
-
-* Context provides a way to pass data through a tree of React components, without having to manually pass props.
-* Context is designed to share data that is considered _global_ for a tree of React components.
-
-
-##### Additional Links
-
-
-* [React docs on Context](https://reactjs.org/docs/context.html)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What are error boundaries in React?
-
-<details>
-<summary>View answer</summary>
-
-Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of the component tree that crashed.
-
-A class component becomes an error boundary if it defines a new lifecycle method called `componentDidCatch`.
-
-```js
-class ErrorBoundary extends React.Component {
-  constructor(props) {
-    super(props)
-    this.state = { hasError: false }
-  }
-
-  componentDidCatch(error, info) {
-    // Display fallback UI
-    this.setState({ hasError: true })
-    // You can also log the error to an error reporting service
-    logErrorToMyService(error, info)
-  }
-
-  render() {
-    if (this.state.hasError) {
-      // You can render any custom fallback UI
-      return <h1>Something went wrong.</h1>
-    }
-    return this.props.children
-  }
-}
-```
-
-
-#### Good to hear
-
-
-
-
-##### Additional Links
-
-
-
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
@@ -3896,32 +3777,6 @@ render() {
 
 * [React docs on Fragments](https://reactjs.org/docs/fragments.html)
 
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
-
-### What are higher-order components?
-
-<details>
-<summary>View answer</summary>
-
-A higher-order component (HOC) is a function that takes a component as an argument and returns a new component. It is a pattern that is derived from React’s compositional nature. Higher-order components are like **pure components** because they accept any dynamically provided child component, but they won’t modify or copy any behavior from their input components.
-
-```js
-const EnhancedComponent = higherOrderComponent(WrappedComponent)
-```
-
-
-#### Good to hear
-
-
-* They can be used for state abstraction and manipulation, props manipulation, render high jacking, etc.
-
-
-##### Additional Links
-
-
-
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
@@ -3951,63 +3806,108 @@ handleClick = () => {
   console.log('this is:', this);
 }
 
-render() {
-  return (
-    <button onClick={this.handleClick}>
-      Click me
-    </button>
-  );
-}
-```
+render() {
+  return (
+    <button onClick={this.handleClick}>
+      Click me
+    </button>
+  );
+}
+```
+
+* You can also use an inline arrow function, because lexical `this` (referring to the component instance) is preserved:
+
+```js
+<button onClick={e => this.handleClick(e)}>Click me</button>
+```
+
+Note that extra re-rendering can occur using this technique because a new function reference is created on render, which gets passed down to child components and breaks `shouldComponentUpdate` / `PureComponent` shallow equality checks to prevent unnecessary re-renders. In cases where performance is important, it is preferred to go with `bind` in the constructor, or the public class fields syntax approach, because the function reference remains constant.
+
+
+#### Good to hear
+
+
+* You can either bind methods to the component instance context in the constructor, use public class fields syntax, or use inline arrow functions.
+
+
+##### Additional Links
+
+
+* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
+* [React docs on Passing Functions to Components](https://reactjs.org/docs/faq-functions.html#how-do-i-bind-a-function-to-a-component-instance)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are error boundaries in React?
+
+<details>
+<summary>View answer</summary>
+
+Error boundaries are React components that catch JavaScript errors anywhere in their child component tree, log those errors, and display a fallback UI instead of the component tree that crashed.
 
-* You can also use an inline arrow function, because lexical `this` (referring to the component instance) is preserved:
+A class component becomes an error boundary if it defines a new lifecycle method called `componentDidCatch`.
 
 ```js
-<button onClick={e => this.handleClick(e)}>Click me</button>
-```
+class ErrorBoundary extends React.Component {
+  constructor(props) {
+    super(props)
+    this.state = { hasError: false }
+  }
 
-Note that extra re-rendering can occur using this technique because a new function reference is created on render, which gets passed down to child components and breaks `shouldComponentUpdate` / `PureComponent` shallow equality checks to prevent unnecessary re-renders. In cases where performance is important, it is preferred to go with `bind` in the constructor, or the public class fields syntax approach, because the function reference remains constant.
+  componentDidCatch(error, info) {
+    // Display fallback UI
+    this.setState({ hasError: true })
+    // You can also log the error to an error reporting service
+    logErrorToMyService(error, info)
+  }
+
+  render() {
+    if (this.state.hasError) {
+      // You can render any custom fallback UI
+      return <h1>Something went wrong.</h1>
+    }
+    return this.props.children
+  }
+}
+```
 
 
 #### Good to hear
 
 
-* You can either bind methods to the component instance context in the constructor, use public class fields syntax, or use inline arrow functions.
 
 
 ##### Additional Links
 
 
-* [React docs on Handling Events](https://reactjs.org/docs/handling-events.html)
-* [React docs on Passing Functions to Components](https://reactjs.org/docs/faq-functions.html#how-do-i-bind-a-function-to-a-component-instance)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are portals in React?
+### What are higher-order components?
 
 <details>
 <summary>View answer</summary>
 
-Portal are the recommended way to render children into a DOM node that exists outside the DOM hierarchy of the parent component.
+A higher-order component (HOC) is a function that takes a component as an argument and returns a new component. It is a pattern that is derived from React’s compositional nature. Higher-order components are like **pure components** because they accept any dynamically provided child component, but they won’t modify or copy any behavior from their input components.
 
 ```js
-ReactDOM.createPortal(child, container)
+const EnhancedComponent = higherOrderComponent(WrappedComponent)
 ```
 
-The first argument (`child`) is any renderable React child, such as an element, string, or fragment. The second argument (`container`) is a DOM element.
-
 
 #### Good to hear
 
 
+* They can be used for state abstraction and manipulation, props manipulation, render high jacking, etc.
 
 
 ##### Additional Links
 
 
-* [React docs on Portals](https://reactjs.org/docs/portals.html)
 
 </details>
 
@@ -4052,6 +3952,34 @@ class User extends React.Component {
 
 
 
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What is context?
+
+<details>
+<summary>View answer</summary>
+
+Context provides a way to pass data through the component tree without having to pass props down manually at every level. For example, authenticated user, locale preference, UI theme need to be accessed in the application by many components.
+
+```js
+const { Provider, Consumer } = React.createContext(defaultValue)
+```
+
+
+#### Good to hear
+
+
+* Context provides a way to pass data through a tree of React components, without having to manually pass props.
+* Context is designed to share data that is considered _global_ for a tree of React components.
+
+
+##### Additional Links
+
+
+* [React docs on Context](https://reactjs.org/docs/context.html)
+
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
@@ -4102,6 +4030,72 @@ Refs can also be used in functional components with the help of closures.
 
 <br>[⬆ Back to top](#table-of-contents)
 
+### What is the `children` prop?
+
+<details>
+<summary>View answer</summary>
+
+`children` is part of the props object passed to components that allows components to be passed as data to other components, providing the ability to compose components cleanly. There are a number of methods available in the React API to work with this prop, such as `React.Children.map`, `React.Children.forEach`, `React.Children.count`, `React.Children.only` and `React.Children.toArray`. A simple usage example of the children prop is as follows:
+
+```js
+function GenericBox({ children }) {
+  return <div className="container">{children}</div>
+}
+
+function App() {
+  return (
+    <GenericBox>
+      <span>Hello</span> <span>World</span>
+    </GenericBox>
+  )
+}
+```
+
+
+#### Good to hear
+
+
+* Children is a prop that allows components to be passed as data to other components.
+* The React API provides methods to work with this prop.
+
+
+##### Additional Links
+
+
+* [React docs on Children](https://reactjs.org/docs/jsx-in-depth.html#children-in-jsx)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### What are portals in React?
+
+<details>
+<summary>View answer</summary>
+
+Portal are the recommended way to render children into a DOM node that exists outside the DOM hierarchy of the parent component.
+
+```js
+ReactDOM.createPortal(child, container)
+```
+
+The first argument (`child`) is any renderable React child, such as an element, string, or fragment. The second argument (`container`) is a DOM element.
+
+
+#### Good to hear
+
+
+
+
+##### Additional Links
+
+
+* [React docs on Portals](https://reactjs.org/docs/portals.html)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
 
 ## HTML
 ### What is the purpose of the `alt` attribute on images?
@@ -4213,93 +4207,65 @@ Yes to both. The W3 documents state that the tags represent the header(`<header>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What are `defer` and `async` attributes on a `<script>` tag?
+### Where and why is the `rel="noopener"` attribute used?
 
 <details>
 <summary>View answer</summary>
 
-If neither attribute is present, the script is downloaded and executed synchronously, and will halt parsing of the document until it has finished executing (default behavior). Scripts are downloaded and executed in the order
-they are encountered.
-
-The `defer` attribute downloads the script while the document is still parsing but waits until the document has finished parsing before executing it, equivalent to executing inside a `DOMContentLoaded` event listener. `defer` scripts will execute in order.
-
-The `async` attribute downloads the script during parsing the document but will pause the parser to execute the script before it has fully finished parsing. `async` scripts will not necessarily execute in order.
-
-Note: both attributes must only be used if the script has a `src` attribute (i.e. not an inline script).
-
-```html
-<script src="myscript.js"></script>
-<script src="myscript.js" defer></script>
-<script src="myscript.js" async></script>
-```
+The `rel="noopener"` is an attribute used in `<a>` elements (hyperlinks). It prevents pages from having a `window.opener` property, which would otherwise point to the page from where the link was opened and would allow the page opened from the hyperlink to manipulate the page where the hyperlink is.
 
 
 #### Good to hear
 
 
-* Placing a `defer` script in the `<head>` allows the browser to download the script while the page is still parsing, and is therefore a better option than placing the script before the end of the body.
-* If the scripts rely on each other, use `defer`.
-* If the script is independent, use `async`.
-* Use `defer` if the DOM must be ready and the contents are not placed within a `DOMContentLoaded` listener.
+* `rel="noopener"` is applied to hyperlinks.
+* `rel="noopener"` prevents opened links from manipulating the source page.
 
 
 ##### Additional Links
 
 
-* [async vs defer attributes](http://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html)
+* [Open external anchors using rel="noopener"](https://developers.google.com/web/tools/lighthouse/audits/noopener)
+* [About rel="noopener"](https://mathiasbynens.github.io/rel-noopener/)
 
 </details>
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### What is the DOM?
+### What are `defer` and `async` attributes on a `<script>` tag?
 
 <details>
 <summary>View answer</summary>
 
-The DOM (Document Object Model) is a cross-platform API that treats HTML and XML documents as a tree structure consisting of nodes. These nodes (such as elements and text nodes) are objects that can be programmatically manipulated and any visible changes made to them are reflected live in the document. In a browser, this API is available to JavaScript where DOM nodes can be manipulated to change their styles, contents, placement in the document, or interacted with through event listeners.
-
-
-#### Good to hear
-
-
-* The DOM was designed to be independent of any particular programming language, making the structural representation of the document available from a single, consistent API.
-* The DOM is constructed progressively in the browser as a page loads, which is why scripts are often placed at the bottom of a page, in the `<head>` with a `defer` attribute, or inside a `DOMContentLoaded` event listener. Scripts that manipulate DOM nodes should be run after the DOM has been constructed to avoid errors.
-* `document.getElementById()` and `document.querySelector()` are common functions for selecting DOM nodes.
-* Setting the `innerHTML` property to a new value runs the string through the HTML parser, offering an easy way to append dynamic HTML content to a node.
-
-
-##### Additional Links
-
-
-* [MDN docs for DOM](https://developer.mozilla.org/en-US/docs/DOM)
-
-</details>
-
-<br>[⬆ Back to top](#table-of-contents)
+If neither attribute is present, the script is downloaded and executed synchronously, and will halt parsing of the document until it has finished executing (default behavior). Scripts are downloaded and executed in the order
+they are encountered.
 
-### Discuss the differences between an HTML specification and a browser’s implementation thereof.
+The `defer` attribute downloads the script while the document is still parsing but waits until the document has finished parsing before executing it, equivalent to executing inside a `DOMContentLoaded` event listener. `defer` scripts will execute in order.
 
-<details>
-<summary>View answer</summary>
+The `async` attribute downloads the script during parsing the document but will pause the parser to execute the script before it has fully finished parsing. `async` scripts will not necessarily execute in order.
 
-HTML specifications such as `HTML5` define a set of rules that a document must adhere to in order to be “valid” according to that specification. In addition, a specification provides instructions on how a browser must interpret and render such a document.
+Note: both attributes must only be used if the script has a `src` attribute (i.e. not an inline script).
 
-A browser is said to “support” a specification if it handles valid documents according to the rules of the specification. As of yet, no browser supports all aspects of the `HTML5` specification (although all of the major browser support most of it), and as a result, it is necessary for the developer to confirm whether the aspect they are making use of will be supported by all of the browsers on which they hope to display their content. This is why cross-browser support continues to be a headache for developers, despite the improved specificiations.
+```html
+<script src="myscript.js"></script>
+<script src="myscript.js" defer></script>
+<script src="myscript.js" async></script>
+```
 
 
 #### Good to hear
 
 
-* `HTML5` defines some rules to follow for an invalid `HTML5` document (i.e., one that contains syntactical errors)
-* However, invalid documents may contain anything, so it's impossible for the specification to handle all possibilities comprehensively.
-* Thus, many decisions about how to handle malformed documents are left up to the browser.
+* Placing a `defer` script in the `<head>` allows the browser to download the script while the page is still parsing, and is therefore a better option than placing the script before the end of the body.
+* If the scripts rely on each other, use `defer`.
+* If the script is independent, use `async`.
+* Use `defer` if the DOM must be ready and the contents are not placed within a `DOMContentLoaded` listener.
 
 
 ##### Additional Links
 
 
-* [HTML 5.2 WWW Specifications](https://www.w3.org/TR/html52/)
+* [async vs defer attributes](http://www.growingwiththeweb.com/2014/02/async-vs-defer-attributes.html)
 
 </details>
 
@@ -4382,26 +4348,54 @@ Some of the key differences are:
 
 <br>[⬆ Back to top](#table-of-contents)
 
-### Where and why is the `rel="noopener"` attribute used?
+### What is the DOM?
 
 <details>
 <summary>View answer</summary>
 
-The `rel="noopener"` is an attribute used in `<a>` elements (hyperlinks). It prevents pages from having a `window.opener` property, which would otherwise point to the page from where the link was opened and would allow the page opened from the hyperlink to manipulate the page where the hyperlink is.
+The DOM (Document Object Model) is a cross-platform API that treats HTML and XML documents as a tree structure consisting of nodes. These nodes (such as elements and text nodes) are objects that can be programmatically manipulated and any visible changes made to them are reflected live in the document. In a browser, this API is available to JavaScript where DOM nodes can be manipulated to change their styles, contents, placement in the document, or interacted with through event listeners.
 
 
 #### Good to hear
 
 
-* `rel="noopener"` is applied to hyperlinks.
-* `rel="noopener"` prevents opened links from manipulating the source page.
+* The DOM was designed to be independent of any particular programming language, making the structural representation of the document available from a single, consistent API.
+* The DOM is constructed progressively in the browser as a page loads, which is why scripts are often placed at the bottom of a page, in the `<head>` with a `defer` attribute, or inside a `DOMContentLoaded` event listener. Scripts that manipulate DOM nodes should be run after the DOM has been constructed to avoid errors.
+* `document.getElementById()` and `document.querySelector()` are common functions for selecting DOM nodes.
+* Setting the `innerHTML` property to a new value runs the string through the HTML parser, offering an easy way to append dynamic HTML content to a node.
 
 
 ##### Additional Links
 
 
-* [Open external anchors using rel="noopener"](https://developers.google.com/web/tools/lighthouse/audits/noopener)
-* [About rel="noopener"](https://mathiasbynens.github.io/rel-noopener/)
+* [MDN docs for DOM](https://developer.mozilla.org/en-US/docs/DOM)
+
+</details>
+
+<br>[⬆ Back to top](#table-of-contents)
+
+### Discuss the differences between an HTML specification and a browser’s implementation thereof.
+
+<details>
+<summary>View answer</summary>
+
+HTML specifications such as `HTML5` define a set of rules that a document must adhere to in order to be “valid” according to that specification. In addition, a specification provides instructions on how a browser must interpret and render such a document.
+
+A browser is said to “support” a specification if it handles valid documents according to the rules of the specification. As of yet, no browser supports all aspects of the `HTML5` specification (although all of the major browser support most of it), and as a result, it is necessary for the developer to confirm whether the aspect they are making use of will be supported by all of the browsers on which they hope to display their content. This is why cross-browser support continues to be a headache for developers, despite the improved specificiations.
+
+
+#### Good to hear
+
+
+* `HTML5` defines some rules to follow for an invalid `HTML5` document (i.e., one that contains syntactical errors)
+* However, invalid documents may contain anything, so it's impossible for the specification to handle all possibilities comprehensively.
+* Thus, many decisions about how to handle malformed documents are left up to the browser.
+
+
+##### Additional Links
+
+
+* [HTML 5.2 WWW Specifications](https://www.w3.org/TR/html52/)
 
 </details>
 
diff --git a/package-lock.json b/package-lock.json
index 249d182c..8511b70c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -14,18 +14,18 @@
       }
     },
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-      "version": "7.5.4",
-      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.5.4.tgz",
-      "integrity": "sha512-+DaeBEpYq6b2+ZmHx3tHspC+ZRflrvLqwfv8E3hNr5LVQoyBnL8RPKSBCg+rK2W2My9PWlujBiqd0ZPsR9Q6zQ==",
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.3.4.tgz",
+      "integrity": "sha512-jRsuseXBo9pN197KnDwhhaaBzyZr2oIcLHHTt2oDdQrej5Qp57dCCJafWx5ivU8/alEYDpssYqv1MUqcxwQlrA==",
       "dev": true,
       "requires": {
         "@babel/code-frame": "^7.0.0",
-        "@babel/generator": "^7.5.0",
-        "@babel/helpers": "^7.5.4",
-        "@babel/parser": "^7.5.0",
-        "@babel/template": "^7.4.4",
-        "@babel/traverse": "^7.5.0",
-        "@babel/types": "^7.5.0",
+        "@babel/generator": "^7.3.4",
+        "@babel/helpers": "^7.2.0",
+        "@babel/parser": "^7.3.4",
+        "@babel/template": "^7.2.2",
+        "@babel/traverse": "^7.3.4",
+        "@babel/types": "^7.3.4",
         "convert-source-map": "^1.1.0",
         "debug": "^4.1.0",
         "json5": "^2.1.0",
@@ -53,12 +53,6 @@
             "minimist": "^1.2.0"
           }
         },
-        "lodash": {
-          "version": "4.17.14",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
-          "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
-          "dev": true
-        },
         "minimist": {
           "version": "1.2.0",
           "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.0.tgz",
@@ -80,24 +74,18 @@
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     },
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-      "version": "7.5.0",
-      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.5.0.tgz",
-      "integrity": "sha512-1TTVrt7J9rcG5PMjvO7VEG3FrEoEJNHxumRq66GemPmzboLWtIjjcJgk8rokuAS7IiRSpgVSu5Vb9lc99iJkOA==",
+      "version": "7.3.4",
+      "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.3.4.tgz",
+      "integrity": "sha512-8EXhHRFqlVVWXPezBW5keTiQi/rJMQTg/Y9uVCEZ0CAF3PKtCCaVRnp64Ii1ujhkoDhhF1fVsImoN4yJ2uz4Wg==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.5.0",
+        "@babel/types": "^7.3.4",
         "jsesc": "^2.5.1",
         "lodash": "^4.17.11",
         "source-map": "^0.5.0",
         "trim-right": "^1.0.1"
       },
       "dependencies": {
-        "lodash": {
-          "version": "4.17.14",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
-          "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
-          "dev": true
-        },
         "source-map": {
           "version": "0.5.7",
           "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.7.tgz",
@@ -144,23 +132,125 @@
         "@babel/helper-hoist-variables": "^7.4.4",
         "@babel/traverse": "^7.4.4",
         "@babel/types": "^7.4.4"
+      },
+      "dependencies": {
+        "@babel/code-frame": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/code-frame/-/code-frame-7.5.5.tgz",
+          "integrity": "sha512-27d4lZoomVyo51VegxI20xZPuSHusqbQag/ztrBC7wegWoQ1nLREPVSKSW8byhTlzTKyNE4ifaTA6lCp7JjpFw==",
+          "dev": true,
+          "requires": {
+            "@babel/highlight": "^7.0.0"
+          }
+        },
+        "@babel/generator": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/generator/-/generator-7.5.5.tgz",
+          "integrity": "sha512-ETI/4vyTSxTzGnU2c49XHv2zhExkv9JHLTwDAFz85kmcwuShvYG2H08FwgIguQf4JC75CBnXAUM5PqeF4fj0nQ==",
+          "dev": true,
+          "requires": {
+            "@babel/types": "^7.5.5",
+            "jsesc": "^2.5.1",
+            "lodash": "^4.17.13",
+            "source-map": "^0.5.0",
+            "trim-right": "^1.0.1"
+          }
+        },
+        "@babel/parser": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/parser/-/parser-7.5.5.tgz",
+          "integrity": "sha512-E5BN68cqR7dhKan1SfqgPGhQ178bkVKpXTPEXnFJBrEt8/DKRZlybmy+IgYLTeN7tp1R5Ccmbm2rBk17sHYU3g==",
+          "dev": true
+        },
+        "@babel/traverse": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/traverse/-/traverse-7.5.5.tgz",
+          "integrity": "sha512-MqB0782whsfffYfSjH4TM+LMjrJnhCNEDMDIjeTpl+ASaUvxcjoiVCo/sM1GhS1pHOXYfWVCYneLjMckuUxDaQ==",
+          "dev": true,
+          "requires": {
+            "@babel/code-frame": "^7.5.5",
+            "@babel/generator": "^7.5.5",
+            "@babel/helper-function-name": "^7.1.0",
+            "@babel/helper-split-export-declaration": "^7.4.4",
+            "@babel/parser": "^7.5.5",
+            "@babel/types": "^7.5.5",
+            "debug": "^4.1.0",
+            "globals": "^11.1.0",
+            "lodash": "^4.17.13"
+          }
+        },
+        "@babel/types": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
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+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
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+          "dev": true,
+          "requires": {
+            "ms": "^2.1.1"
+          }
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+          "version": "11.12.0",
+          "resolved": "https://registry.npmjs.org/globals/-/globals-11.12.0.tgz",
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+          "dev": true
+        },
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+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w==",
+          "dev": true
+        },
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+          "integrity": "sha1-igOdLRAh0i0eoUyA2OpGi6LvP8w=",
+          "dev": true
+        },
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
       }
     },
     "@babel/helper-define-map": {
-      "version": "7.4.4",
-      "resolved": "https://registry.npmjs.org/@babel/helper-define-map/-/helper-define-map-7.4.4.tgz",
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+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-define-map/-/helper-define-map-7.5.5.tgz",
+      "integrity": "sha512-fTfxx7i0B5NJqvUOBBGREnrqbTxRh7zinBANpZXAVDlsZxYdclDp467G1sQ8VZYMnAURY3RpBUAgOYT9GfzHBg==",
       "dev": true,
       "requires": {
         "@babel/helper-function-name": "^7.1.0",
-        "@babel/types": "^7.4.4",
-        "lodash": "^4.17.11"
+        "@babel/types": "^7.5.5",
+        "lodash": "^4.17.13"
       },
       "dependencies": {
-        "lodash": {
-          "version": "4.17.14",
-          "resolved": "https://registry.npmjs.org/lodash/-/lodash-4.17.14.tgz",
-          "integrity": "sha512-mmKYbW3GLuJeX+iGP+Y7Gp1AiGHGbXHCOh/jZmrawMmsE7MS4znI3RL2FsjbqOyMayHInjOeykW7PEajUk1/xw==",
+        "@babel/types": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
+          "integrity": "sha512-s63F9nJioLqOlW3UkyMd+BYhXt44YuaFm/VV0VwuteqjYwRrObkU7ra9pY4wAJR3oXi8hJrMcrcJdO/HH33vtw==",
+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
           "dev": true
         }
       }
@@ -202,15 +292,53 @@
       "dev": true,
       "requires": {
         "@babel/types": "^7.4.4"
+      },
+      "dependencies": {
+        "@babel/types": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
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+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
       }
     },
     "@babel/helper-member-expression-to-functions": {
-      "version": "7.0.0",
-      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.0.0.tgz",
-      "integrity": "sha512-avo+lm/QmZlv27Zsi0xEor2fKcqWG56D5ae9dzklpIaY7cQMK5N8VSpaNVPPagiqmy7LrEjK1IWdGMOqPu5csg==",
+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-member-expression-to-functions/-/helper-member-expression-to-functions-7.5.5.tgz",
+      "integrity": "sha512-5qZ3D1uMclSNqYcXqiHoA0meVdv+xUEex9em2fqMnrk/scphGlGgg66zjMrPJESPwrFJ6sbfFQYUSa0Mz7FabA==",
       "dev": true,
       "requires": {
-        "@babel/types": "^7.0.0"
+        "@babel/types": "^7.5.5"
+      },
+      "dependencies": {
+        "@babel/types": {
+          "version": "7.5.5",
+          "resolved": "https://registry.npmjs.org/@babel/types/-/types-7.5.5.tgz",
+          "integrity": "sha512-s63F9nJioLqOlW3UkyMd+BYhXt44YuaFm/VV0VwuteqjYwRrObkU7ra9pY4wAJR3oXi8hJrMcrcJdO/HH33vtw==",
+          "dev": true,
+          "requires": {
+            "esutils": "^2.0.2",
+            "lodash": "^4.17.13",
+            "to-fast-properties": "^2.0.0"
+          }
+        },
+        "to-fast-properties": {
+          "version": "2.0.0",
+          "resolved": "https://registry.npmjs.org/to-fast-properties/-/to-fast-properties-2.0.0.tgz",
+          "integrity": "sha1-3F5pjL0HkmW8c+A3doGk5Og/YW4=",
+          "dev": true
+        }
       }
     },
     "@babel/helper-module-imports": {
@@ -223,23 +351,51 @@
       }
     },
     "@babel/helper-module-transforms": {
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-      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.4.4.tgz",
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+      "version": "7.5.5",
+      "resolved": "https://registry.npmjs.org/@babel/helper-module-transforms/-/helper-module-transforms-7.5.5.tgz",
+      "integrity": "sha512-jBeCvETKuJqeiaCdyaheF40aXnnU1+wkSiUs/IQg3tB85up1LyL8x77ClY8qJpuRJUcXQo+ZtdNESmZl4j56Pw==",
       "dev": true,
       "requires": {
         "@babel/helper-module-imports": "^7.0.0",
         "@babel/helper-simple-access": "^7.1.0",
         "@babel/helper-split-export-declaration": "^7.4.4",
         "@babel/template": "^7.4.4",
-        "@babel/types": "^7.4.4",
-        "lodash": "^4.17.11"
+        "@babel/types": "^7.5.5",
+        "lodash": "^4.17.13"
       },
       "dependencies": {
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@@ -7217,13 +7080,82 @@
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+          "requires": {
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+            "escape-string-regexp": "^1.0.5",
+            "supports-color": "^5.3.0"
+          }
+        },
         "chownr": {
-          "version": "1.0.1",
+          "version": "1.1.2",
+          "bundled": true
+        },
+        "ci-info": {
+          "version": "2.0.0",
+          "bundled": true
+        },
+        "cidr-regex": {
+          "version": "2.0.10",
+          "bundled": true,
+          "requires": {
+            "ip-regex": "^2.1.0"
+          }
+        },
+        "cli-boxes": {
+          "version": "1.0.0",
           "bundled": true
         },
         "cli-columns": {
@@ -7283,105 +7279,43 @@
           "requires": {
             "string-width": "^2.0.0",
             "strip-ansi": "^3.0.1"
-          },
-          "dependencies": {
-            "string-width": {
-              "version": "2.1.1",
-              "bundled": true,
-              "requires": {
-                "is-fullwidth-code-point": "^2.0.0",
-                "strip-ansi": "^4.0.0"
-              },
-              "dependencies": {
-                "is-fullwidth-code-point": {
-                  "version": "2.0.0",
-                  "bundled": true
-                },
-                "strip-ansi": {
-                  "version": "4.0.0",
-                  "bundled": true,
-                  "requires": {
-                    "ansi-regex": "^3.0.0"
-                  }
-                }
-              }
-            },
-            "strip-ansi": {
-              "version": "3.0.1",
-              "bundled": true,
-              "requires": {
-                "ansi-regex": "^2.0.0"
-              },
-              "dependencies": {
-                "ansi-regex": {
-                  "version": "2.1.1",
-                  "bundled": true
-                }
-              }
-            }
           }
         },
-        "cli-table2": {
-          "version": "0.2.0",
+        "cli-table3": {
+          "version": "0.5.1",
           "bundled": true,
           "requires": {
             "colors": "^1.1.2",
-            "lodash": "^3.10.1",
-            "string-width": "^1.0.1"
+            "object-assign": "^4.1.0",
+            "string-width": "^2.1.1"
+          }
+        },
+        "cliui": {
+          "version": "4.1.0",
+          "bundled": true,
+          "requires": {
+            "string-width": "^2.1.1",
+            "strip-ansi": "^4.0.0",
+            "wrap-ansi": "^2.0.0"
           },
           "dependencies": {
-            "colors": {
-              "version": "1.1.2",
-              "bundled": true,
-              "optional": true
-            },
-            "lodash": {
-              "version": "3.10.1",
+            "ansi-regex": {
+              "version": "3.0.0",
               "bundled": true
             },
-            "string-width": {
-              "version": "1.0.2",
+            "strip-ansi": {
+              "version": "4.0.0",
               "bundled": true,
               "requires": {
-                "code-point-at": "^1.0.0",
-                "is-fullwidth-code-point": "^1.0.0",
-                "strip-ansi": "^3.0.0"
-              },
-              "dependencies": {
-                "code-point-at": {
-                  "version": "1.1.0",
-                  "bundled": true
-                },
-                "is-fullwidth-code-point": {
-                  "version": "1.0.0",
-                  "bundled": true,
-                  "requires": {
-                    "number-is-nan": "^1.0.0"
-                  },
-                  "dependencies": {
-                    "number-is-nan": {
-                      "version": "1.0.1",
-                      "bundled": true
-                    }
-                  }
-                },
-                "strip-ansi": {
-                  "version": "3.0.1",
-                  "bundled": true,
-                  "requires": {
-                    "ansi-regex": "^2.0.0"
-                  },
-                  "dependencies": {
-                    "ansi-regex": {
-                      "version": "2.1.1",
-                      "bundled": true
-                    }
-                  }
-                }
+                "ansi-regex": "^3.0.0"
               }
             }
           }
         },
+        "clone": {
+          "version": "1.0.4",
+          "bundled": true
+        },
         "cmd-shim": {
           "version": "2.0.2",
           "bundled": true,
@@ -7390,7007 +7324,3218 @@
             "mkdirp": "~0.5.0"
           }
         },
+        "co": {
+          "version": "4.6.0",
+          "bundled": true
+        },
+        "code-point-at": {
+          "version": "1.1.0",
+          "bundled": true
+        },
+        "color-convert": {
+          "version": "1.9.1",
+          "bundled": true,
+          "requires": {
+            "color-name": "^1.1.1"
+          }
+        },
+        "color-name": {
+          "version": "1.1.3",
+          "bundled": true
+        },
+        "colors": {
+          "version": "1.3.3",
+          "bundled": true,
+          "optional": true
+        },
         "columnify": {
           "version": "1.5.4",
           "bundled": true,
           "requires": {
             "strip-ansi": "^3.0.0",
             "wcwidth": "^1.0.0"
+          }
+        },
+        "combined-stream": {
+          "version": "1.0.6",
+          "bundled": true,
+          "requires": {
+            "delayed-stream": "~1.0.0"
+          }
+        },
+        "concat-map": {
+          "version": "0.0.1",
+          "bundled": true
+        },
+        "concat-stream": {
+          "version": "1.6.2",
+          "bundled": true,
+          "requires": {
+            "buffer-from": "^1.0.0",
+            "inherits": "^2.0.3",
+            "readable-stream": "^2.2.2",
+            "typedarray": "^0.0.6"
           },
           "dependencies": {
-            "strip-ansi": {
-              "version": "3.0.1",
+            "readable-stream": {
+              "version": "2.3.6",
               "bundled": true,
               "requires": {
-                "ansi-regex": "^2.0.0"
-              },
-              "dependencies": {
-                "ansi-regex": {
-                  "version": "2.1.1",
-                  "bundled": true
-                }
+                "core-util-is": "~1.0.0",
+                "inherits": "~2.0.3",
+                "isarray": "~1.0.0",
+                "process-nextick-args": "~2.0.0",
+                "safe-buffer": "~5.1.1",
+                "string_decoder": "~1.1.1",
+                "util-deprecate": "~1.0.1"
               }
             },
-            "wcwidth": {
-              "version": "1.0.1",
+            "string_decoder": {
+              "version": "1.1.1",
               "bundled": true,
               "requires": {
-                "defaults": "^1.0.3"
-              },
-              "dependencies": {
-                "defaults": {
-                  "version": "1.0.3",
-                  "bundled": true,
-                  "requires": {
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-                  },
-                  "dependencies": {
-                    "clone": {
-                      "version": "1.0.2",
-                      "bundled": true
-                    }
-                  }
-                }
+                "safe-buffer": "~5.1.0"
               }
             }
           }
         },
         "config-chain": {
-          "version": "1.1.11",
+          "version": "1.1.12",
           "bundled": true,
           "requires": {
             "ini": "^1.3.4",
             "proto-list": "~1.2.1"
-          },
-          "dependencies": {
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-              "bundled": true
-            }
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-          "version": "1.0.1",
-          "bundled": true
-        },
-        "detect-indent": {
-          "version": "5.0.0",
-          "bundled": true
+        "configstore": {
+          "version": "3.1.2",
+          "bundled": true,
+          "requires": {
+            "dot-prop": "^4.1.0",
+            "graceful-fs": "^4.1.2",
+            "make-dir": "^1.0.0",
+            "unique-string": "^1.0.0",
+            "write-file-atomic": "^2.0.0",
+            "xdg-basedir": "^3.0.0"
+          }
         },
-        "detect-newline": {
-          "version": "2.1.0",
+        "console-control-strings": {
+          "version": "1.1.0",
           "bundled": true
         },
-        "dezalgo": {
-          "version": "1.0.3",
+        "copy-concurrently": {
+          "version": "1.0.5",
           "bundled": true,
           "requires": {
-            "asap": "^2.0.0",
-            "wrappy": "1"
+            "aproba": "^1.1.1",
+            "fs-write-stream-atomic": "^1.0.8",
+            "iferr": "^0.1.5",
+            "mkdirp": "^0.5.1",
+            "rimraf": "^2.5.4",
+            "run-queue": "^1.0.0"
           },
           "dependencies": {
-            "asap": {
-              "version": "2.0.5",
+            "aproba": {
+              "version": "1.2.0",
+              "bundled": true
+            },
+            "iferr": {
+              "version": "0.1.5",
               "bundled": true
             }
           }
         },
-        "editor": {
-          "version": "1.0.0",
-          "bundled": true
-        },
-        "figgy-pudding": {
-          "version": "3.1.0",
-          "bundled": true
-        },
-        "find-npm-prefix": {
+        "core-util-is": {
           "version": "1.0.2",
           "bundled": true
         },
-        "fs-vacuum": {
-          "version": "1.2.10",
+        "create-error-class": {
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           "bundled": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "path-is-inside": "^1.0.1",
-            "rimraf": "^2.5.2"
+            "capture-stack-trace": "^1.0.0"
           }
         },
-        "fs-write-stream-atomic": {
-          "version": "1.0.10",
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           "bundled": true,
           "requires": {
-            "graceful-fs": "^4.1.2",
-            "iferr": "^0.1.5",
-            "imurmurhash": "^0.1.4",
-            "readable-stream": "1 || 2"
+            "lru-cache": "^4.0.1",
+            "shebang-command": "^1.2.0",
+            "which": "^1.2.9"
           },
           "dependencies": {
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-              "version": "0.1.5",
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+              "bundled": true,
+              "requires": {
+                "pseudomap": "^1.0.2",
+                "yallist": "^2.1.2"
+              }
+            },
+            "yallist": {
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               "bundled": true
             }
           }
         },
-        "gentle-fs": {
-          "version": "2.0.1",
+        "crypto-random-string": {
+          "version": "1.0.0",
+          "bundled": true
+        },
+        "cyclist": {
+          "version": "0.2.2",
+          "bundled": true
+        },
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           "bundled": true,
           "requires": {
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-            "fs-vacuum": "^1.2.10",
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-          },
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-            "iferr": {
-              "version": "0.1.5",
-              "bundled": true
-            }
+            "assert-plus": "^1.0.0"
           }
         },
-        "glob": {
-          "version": "7.1.2",
+        "debug": {
+          "version": "3.1.0",
           "bundled": true,
           "requires": {
-            "fs.realpath": "^1.0.0",
-            "inflight": "^1.0.4",
-            "inherits": "2",
-            "minimatch": "^3.0.4",
-            "once": "^1.3.0",
-            "path-is-absolute": "^1.0.0"
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           },
           "dependencies": {
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-              "version": "1.0.0",
-              "bundled": true
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-              "bundled": true,
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-                      "bundled": true
-                    }
-                  }
-                }
-              }
-            },
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-              "version": "1.0.1",
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               "bundled": true
             }
           }
         },
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-          "version": "4.1.11",
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           "bundled": true
         },
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-          "version": "2.0.1",
+        "decamelize": {
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           "bundled": true
         },
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-          "version": "2.6.0",
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           "bundled": true
         },
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-          "version": "1.0.0",
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           "bundled": true
         },
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-          "version": "0.1.4",
-          "bundled": true
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+          "bundled": true,
+          "requires": {
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+          }
         },
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           "bundled": true,
           "requires": {
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-            "wrappy": "1"
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           }
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           "bundled": true
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+        "delegates": {
+          "version": "1.0.0",
           "bundled": true
         },
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-          "version": "1.10.3",
+        "detect-indent": {
+          "version": "5.0.0",
+          "bundled": true
+        },
+        "detect-newline": {
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+          "bundled": true
+        },
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           "bundled": true,
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-            "npm-package-arg": "^4.0.0 || ^5.0.0 || ^6.0.0",
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-              "bundled": true,
-              "requires": {
-                "read": "1"
-              }
-            }
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+            "wrappy": "1"
           }
         },
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-          "version": "2.0.5",
+        "dot-prop": {
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           "bundled": true,
           "requires": {
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-                  "version": "2.1.0",
-                  "bundled": true
-                }
-              }
-            }
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           }
         },
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-          "version": "1.0.2",
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           "bundled": true
         },
-        "lazy-property": {
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+          "version": "0.1.4",
           "bundled": true
         },
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           "bundled": true,
           "requires": {
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+            "inflight": "^1.0.4",
+            "inherits": "2",
+            "minimatch": "^3.0.4",
+            "once": "^1.3.0",
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+          "resolved": "https://registry.npmjs.org/is-absolute-url/-/is-absolute-url-3.0.1.tgz",
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+        "postcss-selector-parser": {
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+          "resolved": "https://registry.npmjs.org/postcss-selector-parser/-/postcss-selector-parser-6.0.2.tgz",
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+          "dev": true,
+          "requires": {
+            "cssesc": "^3.0.0",
+            "indexes-of": "^1.0.1",
+            "uniq": "^1.0.1"
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+    "w3c-hr-time": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/w3c-hr-time/-/w3c-hr-time-1.0.1.tgz",
+      "integrity": "sha1-gqwr/2PZUOqeMYmlimViX+3xkEU=",
+      "dev": true,
+      "requires": {
+        "browser-process-hrtime": "^0.1.2"
+      }
+    },
+    "w3c-xmlserializer": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-1.1.2.tgz",
+      "integrity": "sha512-p10l/ayESzrBMYWRID6xbuCKh2Fp77+sA0doRuGn4tTIMrrZVeqfpKjXHY+oDh3K4nLdPgNwMTVP6Vp4pvqbNg==",
+      "dev": true,
+      "requires": {
+        "domexception": "^1.0.1",
+        "webidl-conversions": "^4.0.2",
+        "xml-name-validator": "^3.0.0"
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@@ -16897,18 +13209,55 @@
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       }
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+    "webidl-conversions": {
+      "version": "4.0.2",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-4.0.2.tgz",
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+      "dev": true
+    },
+    "whatwg-encoding": {
+      "version": "1.0.5",
+      "resolved": "https://registry.npmjs.org/whatwg-encoding/-/whatwg-encoding-1.0.5.tgz",
+      "integrity": "sha512-b5lim54JOPN9HtzvK9HFXvBma/rnfFeqsic0hSpjtDbVxR3dJKLc+KB4V6GgiGOvl7CY/KNh8rxSo9DKQrnUEw==",
+      "dev": true,
+      "requires": {
+        "iconv-lite": "0.4.24"
+      },
+      "dependencies": {
+        "iconv-lite": {
+          "version": "0.4.24",
+          "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.4.24.tgz",
+          "integrity": "sha512-v3MXnZAcvnywkTUEZomIActle7RXXeedOR31wwl7VlyoXO4Qi9arvSenNQWne1TcRwhCL1HwLI21bEqdpj8/rA==",
+          "dev": true,
+          "requires": {
+            "safer-buffer": ">= 2.1.2 < 3"
+          }
+        }
+      }
+    },
     "whatwg-fetch": {
       "version": "2.0.4",
       "resolved": "https://registry.npmjs.org/whatwg-fetch/-/whatwg-fetch-2.0.4.tgz",
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-      "resolved": "https://registry.npmjs.org/whet.extend/-/whet.extend-0.9.9.tgz",
-      "integrity": "sha1-+HfVv2SMl+WqVC+twW1qJZucEaE=",
+    "whatwg-mimetype": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-2.3.0.tgz",
+      "integrity": "sha512-M4yMwr6mAnQz76TbJm914+gPpB/nCwvZbJU28cUD6dR004SAxDLOOSUaB1JDRqLtaOV/vi0IC5lEAGFgrjGv/g==",
       "dev": true
     },
+    "whatwg-url": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-7.0.0.tgz",
+      "integrity": "sha512-37GeVSIJ3kn1JgKyjiYNmSLP1yzbpb29jdmwBSgkD9h40/hyrR/OifpVUndji3tmwGgD8qpw7iQu3RSbCrBpsQ==",
+      "dev": true,
+      "requires": {
+        "lodash.sortby": "^4.7.0",
+        "tr46": "^1.0.1",
+        "webidl-conversions": "^4.0.2"
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@@ -16986,6 +13335,18 @@
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       "dev": true
     },
+    "xml-name-validator": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-3.0.0.tgz",
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+      "dev": true
+    },
+    "xmlchars": {
+      "version": "2.1.1",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.1.1.tgz",
+      "integrity": "sha512-7hew1RPJ1iIuje/Y01bGD/mXokXxegAgVS+e+E0wSi2ILHQkYAH1+JXARwTjZSM4Z4Z+c73aKspEcqj+zPPL/w==",
+      "dev": true
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diff --git a/package.json b/package.json
index eff8c292..45a08d77 100644
--- a/package.json
+++ b/package.json
@@ -30,9 +30,9 @@
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     "hyperapp": "^1.2.6",
     "markdown-builder": "^0.8.9",
-    "marked": "^0.3.19",
+    "marked": "^0.7.0",
     "modern-normalize": "^0.4.0",
-    "npm": "^6.0.0",
+    "npm": "^6.10.3",
     "prettier-eslint": "^8.8.1",
     "prismjs": "^1.14.0"
   },
@@ -44,7 +44,7 @@
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     "eslint-plugin-react": "^7.8.2",
     "node-sass": "^4.11.0",
-    "parcel-bundler": "^1.10.0",
+    "parcel-bundler": "^1.12.3",
     "prettier-eslint-cli": "^4.7.1"
   }
 }