Arin ramer

README.md

@@ -30,14 +30,30 @@ Edit this document to include your answers after each question. Make sure to lea
 
 1. Describe the biggest difference between `.forEach` & `.map`.
 
+.forEach executes a provided function once for each array element, while .map does the same thing but then pushes the results to a new array.
+
 2. What is the difference between a function and a method?
 
+A function is usable for general purposes, while a method is a special function specifically used for classes.
+
 3. What is closure?
 
+A closure is a function that references the surrounding state.
+
 4. Describe the four rules of the 'this' keyword.
 
+Window binding: the this keyword being used in the global scope binds to the window object.
+
+Implicit binding: this points to the object on which the function is called. (left of the dot)
+
+Explicit binding: using .call, .apply or .bind to tell Javascript to explicitly point to a certain value.
+
+New binding: this points to the new object created using the new keyword.
+
 5. Why do we need super() in an extended class?
 
+super(); replaces Object.call in ES6.
+
 ## Project Set up
 
 Follow these steps to set up and work on your project:

challenges/classes.js

@@ -1,7 +1,45 @@
 // 1. Copy and paste your prototype in here and refactor into class syntax.
+/* == Step 1: Base Constructor ==
+  Create a constructor function named CuboidMaker that accepts properties for length, width, and height
+*/
+class CuboidMakerClass{
+    constructor(item){
+        this.length = item.length;
+        this.width = item.width;
+        this.height = item.height;
+    }
+    volume() {
+        return this.length * this.width * this.height;
+    }
+    surfaceArea(){
+        return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+    }    
+}
+  /* == Step 2: Volume Method ==
+    Create a method using CuboidMaker's prototype that returns the volume of a given cuboid's length, width, and height
+
+    Formula for cuboid volume: length * width * height
+  */
 
+
+  /* == Step 3: Surface Area Method ==
+    Create another method using CuboidMaker's prototype that returns the surface area of a given cuboid's length, width, and height. 
+
+    Formula for cuboid surface area of a cube: 2 * (length * width + length * height + width * height)
+  */
+
+  /* == Step 4: Create a new object that uses CuboidMaker ==
+    Create a cuboid object that uses the new keyword to use our CuboidMaker constructor
+    Add properties and values of length: 4, width: 5, and height: 5 to cuboid.   
+  */
+
+  const cuboid2 = new CuboidMakerClass({
+    length: 4,
+    width: 5,
+    height: 5
+  })
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130
 
 // Stretch Task: Extend the base class CuboidMaker with a sub class called CubeMaker.  Find out the formulas for volume and surface area for cubes and create those methods using the dimension properties from CuboidMaker.  Test your work by logging out your volume and surface area.

challenges/functions.js

@@ -6,7 +6,21 @@
   * The last parameter accepts a callback
   * The consume function should return the invocation of cb, passing a and b into cb as arguments
 */
+const consume = function(a, b, cb) {
+  return cb(a, b);
+}
+
+function add(num1, num2){
+  return num1 + num2;
+}
 
+function multiply(num1, num2){
+  return num1 * num2;
+}
+
+function greeting(first, last){
+  return `Hello ${first} ${last}, nice to meet you!`
+}
 
 /* Step 2: Create several functions to callback with consume();
   * Create a function named add that returns the sum of two numbers
@@ -16,17 +30,17 @@
 
 
 /* Step 3: Check your work by un-commenting the following calls to consume(): */
-// console.log(consume(2, 2, add)); // 4
-// console.log(consume(10, 16, multiply)); // 160
-// console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
+console.log(consume(2, 2, add)); // 4
+console.log(consume(10, 16, multiply)); // 160
+console.log(consume("Mary", "Poppins", greeting)); // Hello Mary Poppins, nice to meet you!
 
 
 // ==== Closures ==== 
 
 // Explain in your own words why nestedfunction can access the variable internal.
 
 // Explanation: 
-
+// Because internal is being referenced via console.log
 
 const external = "I'm outside the function";
 

challenges/objects-arrays.js

@@ -8,27 +8,54 @@
 
 // tyrannosaurus, carnivorous, 7000kg, 12m, Late Cretaceous
 
+const tyrannosaurus = {
+  name: "tyrannosaurus",
+  diet: "carnivorous",
+  weight: "7000kg",
+  length: "12m",
+  period: "Late Cretaceous",
+  roar(){
+    return "RAWERSRARARWERSARARARRRR!";
+  }
+}
+
 // stegosaurus, herbivorous, 2000kg, 9m, Late Jurassic
 
+const stegosaurus = {
+  name: "stegosaurus",
+  diet: "herbivorous",
+  weight: "2000kg",
+  length: "9m",
+  period: "Late Jurassic"
+}
+
 // velociraptor, carnivorous, 15kg, 1.8m, Late Cretaceous
 
+const velociraptor = {
+  name: "velociraptor",
+  diet: "carnivorous",
+  weight: "15kg",
+  length: "1.8m",
+  period: "Late Cretaceous"
+}
+
 // Using your dinosaur objects, log answers to these questions:
 
 // How much did tyrannosaurus weigh?
-console.log();
+console.log(tyrannosaurus.weight);
 
 // What was the diet of a velociraptor?
-console.log();
+console.log(velociraptor.diet);
 
 // How long was a stegosaurus?
-console.log();
+console.log(stegosaurus.length);
 
 // What time period did tyrannosaurus live in?
-console.log();
+console.log(tyrannosaurus.period);
 
 
 // Create a new roar method for the tyrannosaurus.  When called, return "RAWERSRARARWERSARARARRRR!" Log the result.
-console.log();
+console.log(tyrannosaurus.roar());
 
 
 // ==== Arrays ====
@@ -52,6 +79,11 @@ const graduates = [
 
 Once you have the new array created, sort the universities alphabetically and log the result. */
 const universities = [];
+const unisort = graduates.map(function(element) {
+  return element.university;
+});
+unisort.sort();
+universities.push(unisort);
 console.log(universities);
 
 /* Request 2: Create a new array called contactInfo that contains both first name and email of each student. This will be an array of strings.
@@ -61,10 +93,19 @@ The resulting contact information strings should have a space between the first
 
 Log the result of your new array. */
 const contactInfo = [];
+const contactsort = graduates.map(function(element) {
+  return `${element.first_name} ${element.email}`
+});
+contactInfo.push(contactsort);
 console.log(contactInfo);
 
 /* Request 3: Find out how many universities have the string "Uni" included in their name. Create a new array called unisWithUni that contains them all. This will be an array of objects. Log the result. */
 const unisWithUni = [];
+const stringsort = graduates.forEach(function(element) {
+  if(element.university.includes("Uni")){
+    return unisWithUni.push(element.university);
+  }
+});
 console.log(unisWithUni);
 
 
@@ -91,6 +132,9 @@ The zoos want to display both the scientific name and the animal name in front o
 
 */
 const displayNames = [];
+const animals = zooAnimals.forEach(function(element){
+  displayNames.push(`${element.animal_name} ${element.scientific_name}`)
+})
 console.log(displayNames);
 
 /* Request 2: .map()
@@ -100,6 +144,10 @@ The zoos need a list of all their animal's names (animal_name only) converted to
 */
 
 const lowCaseAnimalNames = [];
+const dinosort = zooAnimals.map(function(element) {
+  return element.animal_name.toLowerCase();
+});
+lowCaseAnimalNames.push(dinosort);
 console.log(lowCaseAnimalNames);
 
 /* Request 3: .filter() 
@@ -108,14 +156,23 @@ The zoos are concerned about animals with a lower population count. Using filter
 
 */
 const lowPopulationAnimals = [];
+const dinofilter = zooAnimals.filter(function(element) {
+  if (element.population < 5) {
+    return `${element.animal_name} ${element.scientific_name}`
+  }
+});
+lowPopulationAnimals.push(dinofilter);
 console.log(lowPopulationAnimals);
 
 /* Request 4: .reduce() 
 
 The zoos need to know their total animal population across the United States. Find the total population from all the zoos using the .reduce() method. Remember the reduce method takes two arguments: a callback (which itself takes two args), and an initial value for the count.
 
 */
-const populationTotal = 0;
+const populationTotal =
+zooAnimals.reduce(function(previous, current) {
+  return previous + current.population;
+}, 0);
 console.log(populationTotal);
 
 

challenges/prototypes.js

@@ -5,29 +5,43 @@
 /* == Step 1: Base Constructor ==
   Create a constructor function named CuboidMaker that accepts properties for length, width, and height
 */
-
+function CuboidMaker(item){
+  this.length = item.length;
+  this.width = item.width;
+  this.height = item.height;
+}
 
 /* == Step 2: Volume Method ==
   Create a method using CuboidMaker's prototype that returns the volume of a given cuboid's length, width, and height
 
   Formula for cuboid volume: length * width * height
 */
-
+CuboidMaker.prototype.volume = function(){
+  return this.length * this.width * this.height;
+}
 
 /* == Step 3: Surface Area Method ==
   Create another method using CuboidMaker's prototype that returns the surface area of a given cuboid's length, width, and height. 
 
   Formula for cuboid surface area of a cube: 2 * (length * width + length * height + width * height)
 */
-
+CuboidMaker.prototype.surfaceArea = function(){
+  return 2 * (this.length * this.width + this.length * this.height + this.width * this.height);
+}
 
 /* == Step 4: Create a new object that uses CuboidMaker ==
   Create a cuboid object that uses the new keyword to use our CuboidMaker constructor
   Add properties and values of length: 4, width: 5, and height: 5 to cuboid.   
 */
 
+const cuboid = new CuboidMaker({
+  length: 4,
+  width: 5,
+  height: 5
+})
+
 // Test your volume and surfaceArea methods by uncommenting the logs below:
-// console.log(cuboid.volume()); // 100
-// console.log(cuboid.surfaceArea()); // 130
+console.log(cuboid.volume()); // 100
+console.log(cuboid.surfaceArea()); // 130