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Code Academy Homepage

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Code Academy makes learning Javascript and other programming languages easy and fun! You don't have to join the site in order to learn but it is a good idea to try out each exercise on your own before checking out the answers. By the time you complete all the exercises, you'll have a basic understanding of how javascript works and will be able to create your own with ease! I found the site extremely helpful and decided to create this answer key to help anyone interested in learning javascript. Enjoy! :)

Introduction Exercise 0 - Name

Code

"unknown"

Introduction Exercise 1 - Character Length

Code

"unknown".length

Introduction Exercise 2 - Simple Math

Code

3 + 4

Introduction Exercise 3 - More Simple Math

Code

100 / 20

Introduction Exercise 4 - Reference Error

Code

eggplant

Section 1 Exercise 0 - Character Length Plus Simple Math

Code

"cake".length * 9

Section 1 Exercise 1 - Executing Javascript

Code

// click Run

Section 1 Exercise 2 - Interactive Javascript

Code

confirm("I feel awesome!");
confirm("I am ready to go.");

Section 1 Exercise 3 - Inputs & Javascript

Code

prompt("Where are you from?");

Section 1 Exercise 4 - Data Types 1 & 2: Numbers & Strings

Code

"This is easy".length

Section 1 Exercise 5 - Data Type 3: Booleans

Code

"I'm coding like a champ!".length > 10

Section 2 Exercise 0 - Using Console Log

Code

console.log(2 * 5)
console.log("Hello")

Section 2 Exercise 1 - Comparisons

Code

console.log(15 > 4);
console.log("Xiao Hui".length < 122);
console.log("Goody Donaldson".length > 8);
console.log(8 * 2 === 16)

Section 2 Exercise 2 - Conditional Statements

Code

if (100 > 2); {
    console.log("You are good at math!");
}

console.log("Just letting you know: your program got to line 6");

Section 2 Exercise 3 - Else Statements

Code

if (10 > 5 * 2) {
    alert("Let's go down the first road!");
} else {
    console.log(1);
    console.log("Oops, please try again");
}

Section 2 Exercise 4 - More Conditional Statements

Code

if ("computer".length * 2 === 16) {
    console.log(1);
    console.log("I am right");
} else {
    console.log(0);
    console.log("I am wrong");
}

Section 2 Exercise 5 - Java Syntax

Code

if (10 === 10) {
    console.log(1);
    console.log("You got a true!");
} else {
    console.log(0);
    console.log("You got a false!");
}

Section 3 Exercise 0 - Mid-Lesson Review

Code

if (12 / 4 === "Ari".length) {
    confirm("Will this run the first block?");
} else {
    confirm("Or the second block?");
}

Section 3 Exercise 1 - Math

Code

if ("Jon".length * 2 / (2 + 1) === 2) {
    console.log("The answer makes sense!");
} else {
    console.log(0);
    console.log("Error Error Error");
}

Section 3 Exercise 2 - Math & The Modulo

Code

console.log(14 % 3);
console.log(99 % 8);
console.log(11 % 3);

Section 3 Exercise 3 - Modulo & "if / else"

Code

if (99 % 3 === 0) {
    console.log("The first number is even!");
} else {
    console.log("The first number is odd!");
}

Section 3 Exercise 4 - Substrings

Code

"wonderful day".substring(3, 7)

Section 3 Exercise 5 - More Substrings

Code

console.log("January".substring(0, 3));
console.log("Melbourne is great".substring(0, 12));
console.log("Hamburgers".substring(3, 10));

Section 4 Exercise 0 - Variables

Code

var myAge = 678;
console.log(myAge);

Section 4 Exercise 1 - More Variables

Code

var myCountry = "America";

console.log(myCountry.length);

console.log(myCountry.substring(0, 3));

Section 4 Exercise 2 - Change Variable Values

Code

var myName = "unknown";

console.log(myName);

console.log(myName.substring(0, 2));

console.log(myName);

Section 4 Exercise 3 - Conclusion Part 1 Review

Code

// lol win
var myJob = "take a guess";
console.log(myJob.length);

Section 4 Exercise 4 - Conclusion Part 2 Final

Code

if ("Code Academy Rocks!!".length * 5 === 100) {
    console.log("I finished my first course!");
    console.log("Success!!!");
} else {
    console.log("Error Error Error");
    console.log("Please Try Again");
}