How to make array.forEach(asyncfn) synchronized?

Question

Say I have an array and I want to perform an async-function on each element of the array.

let a = [x1, x2, x3]

// I want to
await a.forEach(async (x) => {...         


        

Answer 1

I have used a library called async. There a function called eachSeries. It takes an array, an async function, and a callback. The function is called on each item for the array.

This question can open a rabbit hole of complexity. You will need to be careful that your async function doesn't make an asynchronous call. The library provides a callback that can be useful in this case.

function asyncFunction(val, callback) {

   return (function() {
     //do stuff

     callback();
   })();
}

The callback will initiate the a call on the next item in the array.