Java Code Academy Answer Key - Introduction To Programming With Javascript

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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");

}