How can I Interleave / merge async iterables?

Question

Suppose I have some asnyc iterable objects like this:

// Promisified sleep function
const sleep = ms => new Promise((resolve, reject) => {
  setTimeou         


        

Answer 1

I hope I understood your question correctly, here's how I'd approach it:

let results = [];

Promise.all([ a, b, c ].map(async function(source) {
    for await (let item of source) {
        results.push(item);
    }
}))
.then(() => console.log(results));

I tried it with three normal arrays:

var a = [ 1, 2, 3 ];
var b = [ 4, 5, 6 ];
var c = [ 7, 8, 9 ];

And it resulted in [1, 4, 7, 2, 5, 8, 3, 6, 9].