CodeYourFuture · ChrisKoetzee · Jul 15, 2022 · Jul 15, 2022 · Sep 6, 2022
diff --git a/.gitignore b/.gitignore
@@ -1,2 +1,2 @@
-/node_modules/
-/package-lock.json
+/node_modules/
+/package-lock.json
diff --git a/.vscode/settings.json b/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "jira-plugin.workingProject": ""
+}
diff --git a/1-exercises/A-undefined/exercise.js b/1-exercises/A-undefined/exercise.js
@@ -1,36 +1,35 @@
-/*
-    By now, you would have already seen "undefined", either in an error message or being output from your program.
-    But what does it mean? undefined represents the absence of a value.
-
-    In some cases, undefined will be used by a programmer intentionally, and they will write code to handle it.
-    But usually, when you see undefined - it means something has gone wrong!
-
-    Below are 4 typical examples of when you would see undefined.
-    For each example, can you explain why we are seeing undefined?
-*/
-
-// Example 1
-let a;
-console.log(a);
-
-
-// Example 2
-function sayHello() {
-    let message = "Hello";
-}
-
-let hello = sayHello();
-console.log(hello);
-
-
-// Example 3
-function sayHelloToUser(user) {
-    console.log(`Hello ${user}`);
-}
-
-sayHelloToUser();
-
-
-// Example 4
-let arr = [1,2,3];
-console.log(arr[3]);
+/*
+    By now, you would have already seen "undefined", either in an error message or being output from your program.
+    But what does it mean? undefined represents the absence of a value.
+
+    In some cases, undefined will be used by a programmer intentionally, and they will write code to handle it.
+    But usually, when you see undefined - it means something has gone wrong!
+
+    Below are 4 typical examples of when you would see undefined.
+    For each example, can you explain why we are seeing undefined?
+*/
+
+// Example 1
+let a;
+console.log(a);    // the variable a has no assigned value
+
+
+// Example 2
+function sayHello() {
+    let message = "Hello";      // message has not been declared
+}
+
+let hello = sayHello();
+console.log(hello);            // say hello has no parameters
+
+
+// Example 3
+function sayHelloToUser(user) {
+    console.log(`Hello ${user}`);   
+}
+sayHelloToUser();    // sayHelloToUser has not been declared
+
+
+// Example 4
+let arr = [1,2,3];
+console.log(arr[3]);  // in the array there are in indexes 0,1,2 ,but no three
diff --git a/1-exercises/B-while-loop/exercise.js b/1-exercises/B-while-loop/exercise.js
@@ -1,14 +1,29 @@
-/*
-    while loops can be useful when you want to execute some code as long as some condition is true.    
-
-    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.
-*/
-
-function evenNumbers(n) {
-    // TODO
-}
-
-evenNumbers(3); // should output 0,2,4
-evenNumbers(0); // should output nothing
-evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
+/*
+    while loops can be useful when you want to execute some code as long as some condition is true.    
+
+    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.
+*/
+
+let n = 0;
+let number = 0;
+
+function evenNumbers(n) {
+    const list = [];
+    while (number < n && n> 0) {
+        list.push(number * 2);          
+            number++;
+        }
+        return list.join(",");
+    }
+    console.log(evenNumbers(3));
+    console.log(evenNumbers(0));
+    console.log(evenNumbers(10));
+
+
+evenNumbers(3); // should output 0,2,4
+evenNumbers(0); // should output nothing
+evenNumbers(10); // should output 0,2,4,6,8,10,12,14,16,18
+
+
+
diff --git a/1-exercises/C-while-loop-with-array/exercise.js b/1-exercises/C-while-loop-with-array/exercise.js
@@ -1,23 +1,35 @@
-/*
-    Loops can be useful when working with arrays.
-    In the below example, imagine we've defined an array holding the birthdays of your closest friends.
-    Use a while loop to search through the array until you find the first birthday in July, then return that birthday from the function.
-*/
-
-const BIRTHDAYS = [
-    "January 7th",
-    "February 12th",
-    "April 3rd",
-    "April 5th",
-    "May 3rd",
-    "July 11th",
-    "July 17th",
-    "September 28th",
-    "November 15th"
-];
-
-function findFirstJulyBDay(birthdays) {
-    // TODO
-}
-
-console.log(findFirstJulyBDay(BIRTHDAYS)); // should output "July 11th"
+/*
+    Loops can be useful when working with arrays.
+    In the below example, imagine we've defined an array holding the birthdays of your closest friends.
+    Use a while loop to search through the array until you find the first birthday in July, then return that birthday from the function.
+*/
+
+const BIRTHDAYS = [
+    "January 7th",
+    "February 12th",
+    "April 3rd",
+    "April 5th",
+    "May 3rd",
+    "July 11th",
+    "July 17th",
+    "September 28th",
+    "November 15th"
+];
+let i = 0;
+function findFirstJulyBDay(birthdays) {
+   while (birthdays !== BIRTHDAYS) {
+    i++;
+     return BIRTHDAYS[5];
+   } 
+} 
+
+// let i = 0;
+// let firstJuly = BIRTHDAYS.length;
+// function findFirstJulyBDay(birthdays) {
+//    while (i < firstJuly ) {
+//     let  = BIRTHDAYS[5];
+//     i++;
+//    }
+// }
+
+console.log(findFirstJulyBDay(i)); // should output "July 11th"
diff --git a/1-exercises/D-do-while/exercise.js b/1-exercises/D-do-while/exercise.js
@@ -1,15 +1,37 @@
-/*
-    Sometimes when using loops, we'll want to execute the body of the loop at least once. We can make sure this happens by using a do-while loop.
-        - If the condition in a while loop is initially false, the body of the loop will never execute
-        - 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)
-*/
-
-function evenNumbersSum(n) {
-    // TODO
-}
-
-console.log(evenNumbersSum(3)); // should output 6
-console.log(evenNumbersSum(0)); // should output 0
+/*
+    Sometimes when using loops, we'll want to execute the body of the loop at least once. We can make sure this happens by using a do-while loop.
+        - If the condition in a while loop is initially false, the body of the loop will never execute
+        - 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)
+*/
+
+let n = 0;
+let number = 0;
+let i = 0;
+let x = i;
+let y = i;
+
+function evenNumbersSum(n) {
+    const list = []; 
+    do {
+        n += 2;
+        list.push(n + n);
+        n++;
+    } while (n % 2);
+return list.reduce((x, y) => x + y, 0);
+}
+
+
+// function evenNumbers(n) {
+//   const list = [];
+//   while (number < n && n > 0) {
+//     list.push(number * 2);
+//     number++;
+//   }
+//   return list.join(",");
+// }
+
+console.log(evenNumbersSum(3)); // should output 6
+console.log(evenNumbersSum(0)); // should output 0
 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
@@ -1,14 +1,17 @@
-/*
-    for loops can be useful when we already know exactly how many times we want to loop.
-
-    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++;
-}
-// The output shouldn't change.
+/*
+    for loops can be useful when we already know exactly how many times we want to loop.
+
+    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;
+for (let i = 65; i <= 90; i++) {
+    console.log(String.fromCharCode(i));
+}
+// while(i < 26) {
+//     console.log(String.fromCharCode(97 + i));
+//     i++;
+// }
+// The output shouldn't change.
diff --git a/1-exercises/E-for-loop/exercise2.js b/1-exercises/E-for-loop/exercise2.js
@@ -1,39 +1,42 @@
-/*
-    for loops can be useful when we already know exactly how many times we want to loop.
-
-    Below we have 2 arrays which have exactly the same number of values.
-        - The first array is a list of writers
-        - The second array is a list of ages
-    The writers in the first array correspond with the ages in the second array.
-    For example, Virginia Woolf is 59 years old.
-
-    Using a for loop, output to the console a line about the age of each writer.
-*/
-
-const WRITERS = [
-    "Virginia Woolf",
-    "Zadie Smith",
-    "Jane Austen",
-    "Bell Hooks",
-    "Yukiko Motoya"
-]
-
-const AGES = [
-    59,
-    40,
-    41,
-    63,
-    49
-];
-
-// TODO - Write for loop code here
-
-/*
-The output should look something like this:
-
-Virginia Woolf is 59 years old
-Zadie Smith is 40 years old
-Jane Austen is 41 years old
-Bell Hooks is 63 years old
-Yukiko Motoya is 49 years old
-*/
+/*
+    for loops can be useful when we already know exactly how many times we want to loop.
+
+    Below we have 2 arrays which have exactly the same number of values.
+        - The first array is a list of writers
+        - The second array is a list of ages
+    The writers in the first array correspond with the ages in the second array.
+    For example, Virginia Woolf is 59 years old.
+
+    Using a for loop, output to the console a line about the age of each writer.
+*/
+
+const WRITERS = [
+    "Virginia Woolf",
+    "Zadie Smith",
+    "Jane Austen",
+    "Bell Hooks",
+    "Yukiko Motoya"
+]
+
+const AGES = [
+    59,
+    40,
+    41,
+    63,
+    49
+];
+
+let combined = [];
+for (let index = 0; index < WRITERS.length; index++) {
+       console.log(`${WRITERS[index]} is ${AGES[index]} years old.`);
+}
+
+/*
+The output should look something like this:
+
+Virginia Woolf is 59 years old
+Zadie Smith is 40 years old
+Jane Austen is 41 years old
+Bell Hooks is 63 years old
+Yukiko Motoya is 49 years old
+*/
diff --git a/1-exercises/F-for-of-loop/exercise.js b/1-exercises/F-for-of-loop/exercise.js
@@ -1,16 +1,30 @@
-/*
-    A for-of loop is a easy and way of looping through the elements of an array, string or any other "iterable object" (think sequence of elements).    
-*/
-
-// 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"
-];
-
-
-// TODO Use a for-of loop to capitalise and output each letter in the string seperately.
-let str = "codeyourfuture";
+/*
+    A for-of loop is a easy and way of looping through the elements of an array, string or any other "iterable object" (think sequence of elements).    
+*/
+
+// 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"
+];
+
+let station = "";
+for (const index of tubeStations) {
+    station += index;
+    console.log(index);
+}
+
+// TODO Use a for-of loop to capitalise and output each letter in the string seperately.
+let str = "codeyourfuture";
+let letters = "";
+
+for (const CYF of str) {
+    letters += CYF;
+    CYF + "";
+    console.log(CYF.toUpperCase());
+}
+
+