If Statement

Part of the Fundamentals section of Coddy's JavaScript journey — lesson 23 of 77.

If statements allow us to execute code with conditions.

For example, let's look at the following code:

let age = 20;
let status = "Child";
if (age > 18) {
	status = "Adult";
}
age += 1;

The above code checks whether the age variable is bigger than 18. If it is, it will set status to hold "Adult" string.

In the end, the code will increment age by 1 whether the age is bigger than 18 or not.

To use an if statement we need to add parenthesis () that will determine the condition, and everything that is inside the if is in curly braces {}:

if (condition) {
    code;
    code;
    code;
}

If the condition is true, we will enter the code block inside the if (the code inside the curly braces)

Challenge

Beginner

You are given a code.

The variables a and b have missing values, fill them so that the code inside the if statement will be executed!

Bonus: try to find more than one solution!

Cheat sheet

If statements execute code when a condition is true:

if (condition) {
    // code to execute
}

Example:

let age = 20;
let status = "Child";
if (age > 18) {
    status = "Adult";
}

The condition goes inside parentheses () and the code to execute goes inside curly braces {}.

Try it yourself

let a = ?
let b = ?

// Don't change below this line
let c = 0;
if (a >= b && !(b < 10)) {
    c = 2;
}

c += 1;
console.log(`c = ${c}`);

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The Language Hello World!Comments Code Structure

4Operators Part 2

Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3 Type Coercion

7Bill Split Calculator

Welcome Message Calculating The Tip And Total

Splitting The Bill

Formatted Output

10FizzBuzz with a Twist

Game Overview The FizzBuzz Function

Looping The Numbers

Adding The Twist

13Grocery List Tracker

Project Overview Add Item

Remove Item

View List

2Variables

Numbers String Boolean Naming Conventions Empty Variables Recap - Initialize Variables Constants

5Decision Making

If StatementIf - Else Recap - Simple Calculator Nested If - Else Switch Statement

8Loops

For Loop While Loop Break Continue Recap - Factorial Do While Loop Nested Loop

11Arrays Part 1

Declaring an Array Accessing Array Elements Modifying Arrays Array Methods Part 1 Array Methods Part 2 Recap - Array Processor

14Final Challenges

Number Pyramid Double The Odds What To Buy