JavaScript if

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

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

Example Code

javascript

Try it Yourself

if (hour  = 18) {

  text = "You can drive";

}

Nested if

You can use an if statement inside another if statement:

Example

Example Code

javascript

Try it Yourself

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

Example Code

javascript

Try it Yourself

let age = 16;

let country = "USA";

let text = "You can Not drive!";

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

  text = "You can drive!";

}

Interactive Code Examples

JS Example 1

javascript

Try it Yourself

JavaScript syntax and algorithm demonstration.

if (hour < 18) {

    greeting = "Good day";

 }

Examples

javascript

Try it Yourself

JavaScript syntax and algorithm demonstration.

let age = 18;

let text = "You can Not drive";



if (age >= 18) {

  text = "You can drive";

}

JS Example 3

javascript

Try it Yourself

JavaScript syntax and algorithm demonstration.

let age = 16;

let country = "USA";

let text = "You can Not drive!";



if (country == "USA") {

  if (age >= 16) {

    text = "You can drive!";

  }

}

JS Example 4

javascript

Try it Yourself

JavaScript syntax and algorithm demonstration.

let age = 16;

let country = "USA";

let text = "You can Not drive!";



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

  text = "You can drive!";

}

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