JS If Conditions

The JavaScript if Statement

Use the JavaScript if statement to execute a block of code when a condition is true.

Syntax

if (condition) {

  //  block of code to be executed if the condition is true

}

Note: that if is in lowercase letters. Uppercase letters (If or IF) will generate a JavaScript error.

Example

if (hour < 18) {

    greeting = "Good day";

 }

Examples

let age = 18;

let text = "You can Not drive";

if (age >= 18) {

  text = "You can drive";

}

Nested if

You can use an if statement inside another if statement:

Example

let age = 16;

let country = "USA";

let text = "You can Not drive!";

if (country == "USA") {

  if (age >= 16) {

    text = "You can drive!";

  }

}

Nested if statements can make your code more complex.

A better solution is to use the logical AND operator:

Example

let age = 16;

let country = "USA";

let text = "You can Not drive!";

if (country == "USA" && age >= 16) {

  text = "You can drive!";

}