London-class-8-Helena-Rog-JS-Week1

README.md

@@ -14,7 +14,7 @@ The files for the mandatory/extra exercises are intended to be run as jest tests
 - To run the tests for all mandatory/extra exercises, run `npm test`
 - To run only the tests for the mandatory exercises, run `npm test -- --selectProjects mandatory`
 - To run only the tests for the extra exercises, run `npm test -- --selectProjects extra`
-- To run a single exercise/test (for example `mandatory/1-writer.js`), run `npm test -- --testPathPattern mandatory/1-writer.js` (Remember, you can use tab-completion to get files relative to the current directory, so m`Tab ↹`/1-`Tab ↹` will autocomplete get you the test file starting with 1-)
+- To run a single exercise/test (for example `mandatory/1-writer.js`), run ``npm test -- --testPathPattern mandatory/1-writer.js (Remember, you can use tab-completion to get files relative to the current directory, so m`Tab ↹`/1-`Tab ↹` will autocomplete get you the test file starting with 1-)
 
 For more information about tests, look here:
 

exercises/B-hello-world/exercise.js

@@ -1 +1,4 @@
 console.log("Hello world");
+console.log("I've just started to learn JavaScript");
+console.log(500);
+

exercises/C-variables/exercise.js

@@ -1,3 +1,7 @@
 // Start by creating a variable `greeting`
 
+let greeting = "Hello World!";
+
+console.log(greeting);
+console.log(greeting);
 console.log(greeting);

exercises/D-strings/exercise.js

@@ -1,3 +1,6 @@
 // Start by creating a variable `message`
+let message = "This is a string";
+let messageType = typeof message;
 
 console.log(message);
+console.log(messageType);

exercises/E-strings-concatenation/exercise.js

@@ -1,3 +1,7 @@
 // Start by creating a variable `message`
+let messageStart = "Hello, my name is ";
+let myName = "Helen";
+
+let message = messageStart + myName;
 
 console.log(message);

exercises/F-strings-methods/exercise.js

@@ -1,3 +1,13 @@
 // Start by creating a variable `message`
+const myName = "Helen";
+const myNameLength = myName.length;
+const message =
+  "Hello, my name is " +
+  myName +
+  " and my name is " +
+  myNameLength +
+  " characters long.";
 
+console.log(myName);
+console.log(myNameLength);
 console.log(message);

exercises/F-strings-methods/exercise2.js

@@ -1,3 +1,13 @@
-const name = " Daniel  ";
+let myName = " Helen  ";
+let myNameTrimmed = myName.trim();
+let myNameLength = myNameTrimmed.length;
+let message =
+  "Hello, my name is " +
+  myNameTrimmed +
+  " and my name is " +
+  myNameLength +
+  " characters long.";
 
+console.log(myNameLength);
+console.log(myNameTrimmed);
 console.log(message);

exercises/G-numbers/exercise.js

@@ -1 +1,8 @@
 // Start by creating a variables `numberOfStudents` and `numberOfMentors`
+
+let numberOfStudents = 50;
+let numberOfMentors = 25;
+let total = numberOfStudents + numberOfMentors;
+let message = "Total number of students and mentors: " + total;
+
+console.log(message);

exercises/I-floats/exercise.js

@@ -1,2 +1,11 @@
-var numberOfStudents = 15;
-var numberOfMentors = 8;
+let numberOfStudents = 15;
+let numberOfMentors = 8;
+let total = numberOfStudents + numberOfMentors;
+let percentOfStudents = (numberOfStudents * 100) / total;
+let roundPercentStudents = Math.round(percentOfStudents);
+let percentOfMentors = (numberOfMentors * 100) / total;
+let roundPercentMentors = Math.round(percentOfMentors);
+
+console.log(roundPercentStudents);
+
+console.log(roundPercentMentors);

exercises/J-functions/exercise.js

@@ -1,7 +1,8 @@
 function halve(number) {
   // complete the function here
+  return number / 2;
 }
 
-var result = halve(12);
+let result = halve(34);
 
 console.log(result);

exercises/J-functions/exercise2.js

@@ -1,7 +1,8 @@
 function triple(number) {
   // complete function here
+  return number * 3;
 }
 
-var result = triple(12);
+let result = triple(12);
 
 console.log(result);

exercises/K-functions-parameters/exercise.js

@@ -1,9 +1,10 @@
 // Complete the function so that it takes input parameters
-function multiply() {
+function multiply(num1, num2) {
   // Calculate the result of the function and return it
+  return num1 * num2;
 }
 
 // Assign the result of calling the function the variable `result`
-var result = multiply(3, 4);
+let result = multiply(3, 4);
 
 console.log(result);

exercises/K-functions-parameters/exercise2.js

@@ -1,5 +1,8 @@
 // Declare your function first
+function divide(num1, num2) {
+  return num1 / num2;
+}
 
-var result = divide(3, 4);
+let result = divide(3, 4);
 
 console.log(result);

exercises/K-functions-parameters/exercise3.js

@@ -1,5 +1,8 @@
 // Write your function here
+function createGreeting(name) {
+  return "Hello, my name is " + name;
+}
 
-var greeting = createGreeting("Daniel");
+let greeting = createGreeting("Daniel");
 
 console.log(greeting);

exercises/K-functions-parameters/exercise4.js

@@ -1,5 +1,11 @@
 // Declare your function first
 
+function add(num1, num2) {
+  return num1 + num2;
+}
+
+let sum = add(13, 124);
+
 // Call the function and assign to a variable `sum`
 
 console.log(sum);

exercises/K-functions-parameters/exercise5.js

@@ -1,5 +1,10 @@
 // Declare your function here
 
+function createLongGreeting (name, age) {
+    return "Hello, my name is " + name + " and I'm " + age + " years old"
+}
+
 const greeting = createLongGreeting("Daniel", 30);
 
 console.log(greeting);
+

exercises/L-functions-nested/exercise.js

@@ -1,5 +1,29 @@
-var mentor1 = "Daniel";
-var mentor2 = "Irina";
-var mentor3 = "Mimi";
-var mentor4 = "Rob";
-var mentor5 = "Yohannes";
+    var mentor1 = "Daniel";
+    var mentor2 = "Irina";
+    var mentor3 = "Mimi";
+    var mentor4 = "Rob";
+    var mentor5 = "Yohannes";
+
+function helloGreeting(name) {
+    return name;     
+}       
+    function upperCaseGreeting(helloGreeting) {
+        return ("Hello " + helloGreeting).toUpperCase();   
+}
+
+var greeting = helloGreeting;
+var shoutyGreeting = upperCaseGreeting;
+
+
+// console.log(greeting(mentor1));
+// console.log(greeting(mentor2));
+// console.log(greeting(mentor3));
+// console.log(greeting(mentor4));
+// console.log(greeting(mentor5));
+
+console.log(shoutyGreeting(mentor1));
+console.log(shoutyGreeting(mentor2));
+console.log(shoutyGreeting(mentor3));
+console.log(shoutyGreeting(mentor4));
+console.log(shoutyGreeting(mentor5));
+

extra/1-currency-conversion.js

@@ -4,8 +4,18 @@
   The business is breaking out into a new market and need to convert prices to USD
   Write a function that converts a price to USD (exchange rate is 1.4 $ to £)
 */
+function convertToUSD(pound) {
+  let usd = pound * 1.4;
+  return usd;
+  //  return "$" + pound * 1.4.toFixed(2);
+}
 
-function convertToUSD() {}
+// function convertToUSD(amountInPounds) {
+//   const exchangeRate = 1.4;
+//   return amountInPounds * exchangeRate;
+// } // suggested in 'solutions'
+
+// console.log(convertToUSD(200));
 
 /*
   CURRENCY CONVERSION
@@ -15,8 +25,19 @@ function convertToUSD() {}
   They have also decided that they should add a 1% fee to all foreign transactions, which means you only convert 99% of the £ to BRL.
 */
 
-function convertToBRL() {}
+function convertToBRL(pound) {
+  let brl = parseFloat(((pound / 100) * 99 * 5.7).toFixed(2));
+  return brl;
+}
+
+// function convertToBRL(amountInPounds) {
+//   const transactionFee = 0.01;
+//   const exchangeRate = 5.7;
+//   const amountAfterFee = amountInPounds * (1 - transactionFee);
+//   return amountAfterFee * exchangeRate;
+// } //suggested in 'solutions'
 
+// console.log(convertToBRL(10));
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.
 

extra/2-piping.js

@@ -16,26 +16,52 @@
   the final result to the variable goodCode
 */
 
-function add() {
-
+function add(a, b) {
+  return a + b;
 }
 
-function multiply() {
+console.log(add(20, 9));
 
+function multiply(a, b) {
+  return a * b;
 }
 
-function format() {
+console.log(multiply(2, 10));
 
+function format(num) {
+  return "£" + eval(num);
 }
 
+console.log(format(45));
+
 const startingValue = 2;
+function badPractice() {
+  return badCode;
+}
+
+let badCode = "£" + (startingValue + 10) * 2;
+
+console.log(badPractice());
+
+let incrementedValue = startingValue + 10;
+let doubledValue = incrementedValue * 2;
+let formattedValue = "£" + doubledValue;
+
+function goodPractice() {
+  return goodCode;
+}
+
+let goodCode = formattedValue;
+
+// let goodCode = format(multiply(add(startingValue, 10), 2)); //suggested in 'solutions'
 
 // Why can this code be seen as bad practice? Comment your answer.
-let badCode =
+
+// Const should be used for the values we don't re-assign. The name startingValue suggests otherwise
 
 /* BETTER PRACTICE */
 
-let goodCode =
+// let goodCode =
 
 /* ======= TESTS - DO NOT MODIFY ===== 
 There are some Tests in this file that will help you work out if your code is working.