Javascript Pause Loop Until function is finished

Question

I am trying to loop a function but I need the loop to pause, execute the function, then continue the loop. The function takes around 1 to 5 minutes to finish. Then I want to unpause the loop and redo the function 20 times.

What I've tried so far:

for(i = 0; i < 20; i++) {
    //Some function here
}

do {
var i = 0
// Some function here
i++
} while (i < 20)

it will be always like this unless your function is asynchronous — Beingnin
– Beingnin, Commented Oct 9, 2020 at 7:17
If you use asynchronous functions, you have to use Promises and chain them together — Peter Lehnhardt
– Peter Lehnhardt, Commented Oct 9, 2020 at 7:18
It depends on the type of function you use inside the loop. If it is synchronous, the loop wont iterate till it completes. If its asynchronous you need to await for it to wait — Beingnin
– Beingnin, Commented Oct 9, 2020 at 7:18

Beingnin · Accepted Answer · 2020-10-09 07:21:49Z

1

If your function is asynchronous you could define the loop something like this to wait for the process to complete. For synchronous functions you dont have to do anything. The loop will automatically waits till it completes

async function doAll()
{
  for(i = 0; i < 20; i++) {
    await heavyDutyFn()//this function should return a promise always
  }

}

answered Oct 9, 2020 at 7:21

Beingnin

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3 Comments

Random Dude Over a year ago

Didn't work for some reason. Also my heavydutyfn() is async too. Should I remove it?

Beingnin Over a year ago

this is just an example depicting your situation. You should learn to create promises first which essentially uses for i/o operations

Random Dude Over a year ago

Did something like: doFunc();async function rFunc(){//Function here} async function doFunc() {for(i=0; i<20; i++){ await rFunc() } }

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