How to return a value from a function which is passed to another function as a parameter in javascript?

Question

This is my code:-

    function playAudio(sound,audioName)
    {
        sound = new Howl({
            src: ['/audio/'+audioName]
        });
        sound.play();
        return sound;
    }

    var sound;
    setTimeout(playAudio,5000,sound,'smooth_criminal.mp3');

I am passing function playAudio to function setTimeout. playAudio() function returns a value which I want to catch. Is there a way I can get the return value of playAudio.

I am looking for a solution something similar to,

setTimeout(sound = playAudio,5000,sound,'smooth_criminal.mp3');

@gcampbell : Can you show how it is done as I am very new to javascript. — Parag Kadam, Jul 09 '16 at 13:52

score 1 · Accepted Answer · answered Jul 09 '16 at 13:59

You can do this:

setTimeout(function () {
    var sound = playAudio(sound,'smooth_criminal.mp3');
    // do something with sound....
}, 5000);

This creates an anonymous function on-the-fly as you pass it to setTimeout. In it you can write all the code you want...

Just make sure to use the value of sound only when you have called playAudio, so within that anonymous function.

For example, this will not work as one might expect:

var sound;
setTimeout(function () {
    sound = playAudio(sound,'smooth_criminal.mp3');
}, 5000);
// not the right place to do something with sound....
// as it is not available yet.
console.log(sound);

Thanks a lot..this is exactly what I wanted. – Parag Kadam Jul 09 '16 at 14:04 — Parag Kadam, Jul 09 '16 at 14:04

How to return a value from a function which is passed to another function as a parameter in javascript?

1 Answers1