Early exit from function?

Question

I have a function:

function myfunction() {   if (a == 'stop')  // How can I stop the function here? } 

Is there something like exit() in JavaScript?

Answer 1

You can just use return.

function myfunction() {      if(a == 'stop')           return; } 

This will send a return value of undefined to whatever called the function.

var x = myfunction();  console.log( x );  // console shows undefined 

Of course, you can specify a different return value. Whatever value is returned will be logged to the console using the above example.

return false; return true; return "some string"; return 12345; 

Answer 2

Apparently you can do this:

function myFunction() {myFunction:{     console.log('i get executed');     break myFunction;     console.log('i do not get executed'); }} 

See block scopes through the use of a label: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/label

I can't see any downsides yet. But it doesn't seem like a common use.

Derived this answer: JavaScript equivalent of PHP’s die