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'use strict';

class AsyncArray extends Array {

[Symbol.asyncIterator]() {

let i = 0;

return {

next: () => new Promise(resolve => {

setTimeout(() => resolve({

value: this[i],

done: i++ === this.length

}), 0);

})

};

}

// Usage

let k = 0;

const timer = setInterval(() => k++, 10);

(async () => {

const numbers = new AsyncArray(10000).fill(1);

let i = 0;

for await (const number of numbers) {

if (number) i++;

}

clearInterval(timer);

console.dir({ i, k });

})();