Skip to content

JavaScript Void function

  • by

The JavaScript Void function does not return any value. Javascript void function is mostly used while putting an expression into a web application page that may produce an unwanted effect in the application.

<a href="JavaScript:Void(0);">Click here</a>

This is one the very common use of void function of JavaScript.

JavaScript Void function

Simple example code.

<!DOCTYPE html>
  <div id="app"></div>
   <a href="javascript:void(0)" >login</a>



JavaScript Void function

Void in single expression arrow functions

The void operator evaluates the given expression and then returns undefined. When you don’t explicitly return anything from a function, undefined is returned by default. Using void is just more characters and more obscure.

For example, if you have

void someFunction();
function doSomething(number) { return number + 1 }

const fn0 = () => doSomething(1)
const fn1 = () => { doSomething(1) }
const fn2 = () => void doSomething(1)

console.log(fn0()) // 2
console.log(fn1()) // undefined
console.log(fn2()) // undefined

Do comment if you have any doubts or suggestions on this JS void topic.

Note: The All JS Examples codes are tested on the Firefox browser and the Chrome browser.

OS: Windows 10

Code: HTML 5 Version

Leave a Reply

Discover more from Tutorial

Subscribe now to keep reading and get access to the full archive.

Continue reading