JavaScript getting array index from promise

May 9, 2022

The script below returns promise, there is an array inside it with two index, i want to get index=0 and index=1 separately and output them, how can i do it without using console.log?

async function a1(callback) {
  var a = 2 + 2;
  return await [a, callback()];
}

async function a2() {
  var b = 2 + 3;
  return await b;
}
console.log(a1(a2));

My question for Artash Grigoryan

>Solution :

In javascript, async functions always return promise.

I am not entirely sure about your intentions here, but looking at your drawing I would assume that you need to add an extra await on lines 3 and 9.
This code should work for you:

async function a1(callback) {
        var a = 2 + 2;
        return await [a, await callback()];
  }

async function a2() {
    var b = 2 + 3;
    return await b;
}
await a1(a2);

Reference:
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/async_function