Md Obydullah Follow I'm Md Obydullah. I build open-source projects and write about Laravel, Linux server, modern JavaScript and web development.

How to Exit From JavaScript Function

Published on January 5, 2020 22 sec read

In this guide, I’ll show how to exit from a JavaScript function.

Structure

Let’s see the structure:

if ( condition ) {
    return;
}

The return exits the function by returning undefined.

We can also exit the function by returning false:

if ( condition ) {
    return false;
}

At this time, the return exits the function by returning false.

An Example

I’m creating a function to do the sum of two numbers. We want to exit the function if the number/s not given.

function sum(a,b){

	  // exit
    if(!a || !b ){
        return;
    }

   return a + b;
}

console.log(sum()); // undefined
console.log(sum(5)); // undefined
console.log(sum(5,5)); // 10

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Md Obydullah Follow I'm Md Obydullah. I build open-source projects and write about Laravel, Linux server, modern JavaScript and web development.

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