# What is 'void' Operator in JavaScript?

JavascriptWeb DevelopmentFront End Technology

The void is an important keyword in JavaScript, which can be used as a unary operator that appears before its single operand, which may be of any type. This operator specifies an expression to be evaluated without returning a value.

## Syntax

The syntax of void can be either of the following two −

<head>
<script>
<!--
void func()
javascript:void func()
or:
void(func())
javascript:void(func())
//-->
</script>
</head>

The most common use of this operator is in a client-side javascript: URL, where it allows you to evaluate an expression for its side-effects without the browser displaying the value of the evaluated expression.

Here the expression alert ('Warning!!!') is evaluated but it is not loaded back into the current document.

## Example

<html>
</html>