Break execution from function

Question

Is possible to break execution program from function or I need to check boolean val returned?

Code

function check(something) {

    if (!something) return;
    // Else pass and program continuing
}

check(false); // I want to stop execution because function has returned
// Or I need to check value like if (!check(false)) return; ?
// I want easiest possible without re-check value of function..

alert("hello");

A way to stop execution from function, without re-check returned value of it... — Davide, Dec 24 '15 at 10:58
You can only `return` if you're in a function. There's no way to do that from top-level script code. — Barmar, Dec 24 '15 at 10:58
@Barmar [unless you are using Node.js](http://stackoverflow.com/q/28955047/1903116) :D — thefourtheye, Dec 24 '15 at 11:03

score 1 · Answer 1 · answered Dec 24 '15 at 10:58

One way would be to through an Error, but otherwise you would need to use a boolean check, yes. I would recommend to use the boolean

function check(something) {

    if (!something) throw "";
    // Else pass and program continuing
}

check(false); // I want to stop execution because function has returned
// Or I need to check value like if (!check(false)) return; ?
// I want easiest possible without re-check value of function..

alert("hello");

score 0 · Answer 2 · answered Dec 24 '15 at 10:59

Easiest...

(function(){
  function check(something) {

    if (!something) return false;
    // Else pass and program continuing
  }

  if(!check(false)) return; 

  alert("hello");
});

(function(){ ... }); is called IIFE Immediately-invoked function expression.

score 0 · Answer 3 · answered Dec 24 '15 at 11:00

Put your code in an IIFE, then you can use return

(function() {
    function check(something) {
        if (!something) {
            return false;
        } else {
            return true;
        }
    }

    if (!check(false)) {
        return;
    }

    alert("hello");
});

Break execution from function

3 Answers3