How to Exit From JavaScript Function
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
Md Obydullah
Software Engineer | Ethical Hacker & Cybersecurity...
Md Obydullah is a software engineer and full stack developer specialist at Laravel, Django, Vue.js, Node.js, Android, Linux Server, and Ethichal Hacking.