Question

158

Nested setTimeout alternative?

rated 0 times [ 165] [ 7] / answers: 1 / hits: 22038 / 11 Years ago, wed, july 10, 2013, 12:00:00

I need to execute 3 functions in a 1 sec delay.

for simplicity those functions are :

console.log('1');

console.log('2');

console.log('3');

I could do this: ( very ugly)

 console.log('1')

 setTimeout(function () {

     setTimeout(function () {

         console.log('2')

         setTimeout(function () {

             console.log('3')



         }, 1000)

     }, 1000)



 }, 1000)

Or I could create an array of functions and use setInterval with global counter.

Is there any elegant way of doing this ?

(p.s. function no.2 is not dependent on function number 1... hence - every sec execute the next function.).

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wilson

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answered 11 Years ago masonm · Accepted Answer

You can use something like this with setTimeout:

var funcs = [func1, func2, func3],

    i = 0;



function callFuncs() {

    funcs[i++]();

    if (i < funcs.length) setTimeout(callFuncs, 1000);

}

setTimeout(callFuncs, 1000); //delay start 1 sec.

or start by just calling callFuncs() directly.

Update

An setInterval approach (be aware of the risk of call stacking):

var funcs = [func1, func2, func3],

    i = 0,

    timer = setInterval(callFuncs, 1000);



function callFuncs() {

    funcs[i++]();

    if (i === funcs.length) clearInterval(timer);

}