CodeYourFuture · chandredewet · Jul 22, 2022 · Jul 22, 2022 · Jul 26, 2022 · Jul 26, 2022
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -12,25 +12,26 @@
 // Example 1
 let a;
 console.log(a);
-
+//this is because a has not been assigned a value.
 
 // Example 2
 function sayHello() {
-    let message = "Hello";
+  let message = "Hello";
 }
 
 let hello = sayHello();
 console.log(hello);
-
+//nothing is being returned from the function therefore the variable "hello" contains nothing and is undefined.
 
 // Example 3
 function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
+  console.log(`Hello ${user}`);
 }
 
 sayHelloToUser();
-
+//no user argument was passed on as a parameter therefore calling it in the function will be undefined.
 
 // Example 4
-let arr = [1,2,3];
+let arr = [1, 2, 3];
 console.log(arr[3]);
+//there is no value at arr[3] which is the fourth position.
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -3,10 +3,30 @@
 
     Using a while loop, complete the function below so it logs (using console.log) the first n even numbers as a comma-seperated string.
     The list of numbers should start with 0. n is being passed in as a parameter.
+
+    0,2,4,6,8,10,12,14,16,18,20 - even numbers
+    1,3,5,7,9,11,13,15 - odd numbers
+    evenNumbers(3); 
+
 */
 
+//PSEUDO CODE - display even numbers starting at a 0 and ending the n amount of Times passed in.
+// evenNumbers(3); // should output 0,2,4
+// evenNumbers(0); // should output nothing
+// evenNumbers(4); // should output 0,2,4,6
+
 function evenNumbers(n) {
-    // TODO
+  // TODO
+
+  let i = 0;
+  let evenArr = [];
+
+  while (i < n) {
+    //increment i
+    evenArr.push(i * 2);
+    i++;
+  }
+  console.log(evenArr.join(", "));
 }
 
 evenNumbers(3); // should output 0,2,4

diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -5,19 +5,32 @@
 */
 
 const BIRTHDAYS = [
-    "January 7th",
-    "February 12th",
-    "April 3rd",
-    "April 5th",
-    "May 3rd",
-    "July 11th",
-    "July 17th",
-    "September 28th",
-    "November 15th"
+  "January 7th",
+  "February 12th",
+  "April 3rd",
+  "April 5th",
+  "May 3rd",
+  "July 11th",
+  "July 17th",
+  "September 28th",
+  "November 15th",
 ];
 
 function findFirstJulyBDay(birthdays) {
-    // TODO
+  let i = 0;
+  let bdayCheck;
+
+  while (i < birthdays.length - 1) {
+    bdayCheck = birthdays[i];
+
+    if (bdayCheck.startsWith("July")) {
+      return bdayCheck;
+    }
+
+    i++;
+  }
+
+  // TODO
 }
 
 console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
@@ -4,12 +4,23 @@
         - But in a do-while loop, because the condition is checked after the body, we know that it will always execute at least once
 
     Using a do-while loop, write a function which returns the sum of the first n even numbers (starting from 0)
+    //0,2,4,6,8 - even numbers
 */
 
 function evenNumbersSum(n) {
-    // TODO
+  // TODO
+
+  let i = 0;
+  //initialise sum to 0 so that the variable is a number
+  let sum = 0;
+
+  do {
+    sum = sum + i * 2;
+    i++;
+  } while (i < n);
+  return sum;
 }
 
 console.log(evenNumbersSum(3)); // should output 6
 console.log(evenNumbersSum(0)); // should output 0
-console.log(evenNumbersSum(10)); // should output 90
+console.log(evenNumbersSum(10)); // should output 90
diff --git a/1-exercises/E-for-loop/exercise1.js b/1-exercises/E-for-loop/exercise1.js
@@ -4,11 +4,9 @@
     Change the while loop below into a for loop.
 */
 
-
 // Change the below code to use a for loop instead of a while loop.
-let i = 0;
-while(i < 26) {
-    console.log(String.fromCharCode(97 + i));
-    i++;
+
+for (let i = 0; i < 26; i++) {
+  console.log(String.fromCharCode(97 + i));
 }
 // The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -11,23 +11,23 @@
 */
 
 const WRITERS = [
-    "Virginia Woolf",
-    "Zadie Smith",
-    "Jane Austen",
-    "Bell Hooks",
-    "Yukiko Motoya"
-]
-
-const AGES = [
-    59,
-    40,
-    41,
-    63,
-    49
+  "Virginia Woolf",
+  "Zadie Smith",
+  "Jane Austen",
+  "Bell Hooks",
+  "Yukiko Motoya",
 ];
 
+const AGES = [59, 40, 41, 63, 49];
+
 // TODO - Write for loop code here
 
+//Virginia Woolf is 59 years old
+
+for (let i = 0; i < WRITERS.length; i++) {
+  console.log(`${WRITERS[i]} is ${AGES[i]} years old`);
+}
+
 /*
 The output should look something like this:
 

diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
@@ -4,13 +4,20 @@
 
 // TODO Use a for-of loop to output each of the tube stations below.
 let tubeStations = [
-    "Aldgate",
-    "Baker Street",
-    "Picadilly Circus",
-    "Oxford Street",
-    "Tottenham Court Road"
+  "Aldgate",
+  "Baker Street",
+  "Picadilly Circus",
+  "Oxford Street",
+  "Tottenham Court Road",
 ];
 
+for (let station of tubeStations) {
+  console.log(station);
+}
 
 // TODO Use a for-of loop to capitalise and output each letter in the string seperately.
 let str = "codeyourfuture";
+
+for (let letter of str) {
+  console.log(letter.toUpperCase());
+}
diff --git a/2-mandatory/1-weather-report.js b/2-mandatory/1-weather-report.js
@@ -6,58 +6,60 @@
 
     Implement the function below:
         - take the array of cities as a parameter
-        - return an array of strings, which is a statement about the temperature of each city.
+        - return an array of strings, which is a statement about the temperature of each city.  return
             For example, "The temperature in London is 10 degrees"
         - Hint: you can call the temperatureService function from your function
 */
 
 function getTemperatureReport(cities) {
-    // TODO
-}
+  // TODO
+
+  let tempArray = [];
+
+  for (let city of cities) {
+    tempArray.push(
+      `The temperature in ${city} is ${temperatureService(city)} degrees`
+    );
+  }
 
+  return tempArray;
+}
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 function temperatureService(city) {
-    let temparatureMap  = new Map();
-
-    temparatureMap.set('London', 10);
-    temparatureMap.set('Paris', 12);
-    temparatureMap.set('Barcelona', 17);
-    temparatureMap.set('Dubai', 27);
-    temparatureMap.set('Mumbai', 29);
-    temparatureMap.set('São Paulo', 23);
-    temparatureMap.set('Lagos', 33);
-    
-    return temparatureMap.get(city);
+  let temparatureMap = new Map();
+
+  temparatureMap.set("London", 10);
+  temparatureMap.set("Paris", 12);
+  temparatureMap.set("Barcelona", 17);
+  temparatureMap.set("Dubai", 27);
+  temparatureMap.set("Mumbai", 29);
+  temparatureMap.set("São Paulo", 23);
+  temparatureMap.set("Lagos", 33);
+
+  return temparatureMap.get(city);
 }
 
 test("should return a temperature report for the user's cities", () => {
-    let usersCities = [
-        "London",
-        "Paris",
-        "São Paulo"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in London is 10 degrees",
-        "The temperature in Paris is 12 degrees",
-        "The temperature in São Paulo is 23 degrees"
-    ]);
+  let usersCities = ["London", "Paris", "São Paulo"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in London is 10 degrees",
+    "The temperature in Paris is 12 degrees",
+    "The temperature in São Paulo is 23 degrees",
+  ]);
 });
 
 test("should return a temperature report for the user's cities (alternate input)", () => {
-    let usersCities = [
-        "Barcelona",
-        "Dubai"
-    ]
-
-    expect(getTemperatureReport(usersCities)).toEqual([
-        "The temperature in Barcelona is 17 degrees",
-        "The temperature in Dubai is 27 degrees"
-    ]);
+  let usersCities = ["Barcelona", "Dubai"];
+
+  expect(getTemperatureReport(usersCities)).toEqual([
+    "The temperature in Barcelona is 17 degrees",
+    "The temperature in Dubai is 27 degrees",
+  ]);
 });
 
 test("should return an empty array if the user hasn't selected any cities", () => {
-    expect(getTemperatureReport([])).toEqual([]);
-});
+  expect(getTemperatureReport([])).toEqual([]);
+});
diff --git a/2-mandatory/2-retrying-random-numbers.js b/2-mandatory/2-retrying-random-numbers.js
@@ -5,20 +5,25 @@
 
 // This function shouldn't be changed
 function generateRandomNumber() {
-    console.log("Generating number...");
-    return Math.round(Math.random() * 100);
+  console.log("Generating number...");
+  return Math.round(Math.random() * 100);
 }
 
 function getRandomNumberGreaterThan50() {
-    // TODO - implement using a do-while loop
+  // TODO - implement using a do-while loop
+  let num = 0;
+  do {
+    num = generateRandomNumber();
+  } while (num <= 50);
+  return num;
 }
 
 /* ======= TESTS - DO NOT MODIFY ===== */
 
 test("Returned value should always be greater than 50", () => {
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
-    expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
+  expect(getRandomNumberGreaterThan50()).toBeGreaterThan(50);
 });