JavaScript - if...else statement

In this article, we would like to show you how to use if...else statement in JavaScript.

Description

The if statement executes a statement if a specified condition is truthy. If the condition is falsy, another statement can be executed using else if or else keyword.

Syntax

if (condition) {
  // statement 1
} else {
  // statement 2
}

Practical examples

Example 1 - simple if...else

// ONLINE-RUNNER:browser;

let x = 1;

if (x == 1) {
  console.log('x is equal to 1');
} else {
  console.log('x is not equal to 1');
}

Output:

x is equal to 1

Example 2 - multiple if...else

// ONLINE-RUNNER:browser;

let x = 1;

if (x > 0) {
  console.log('x is a positive number');
} else if (x < 0) {
  console.log('x is a negative number');
} else {
  console.log('x is equal to 0');
}

Output:

x is a positive number

References

1. if...else - JavaScript | MDN