CODEWITHSUNDEEP
javascriptfor-loopasynchronous
Rafi Henig
Rafi Henig

Reputation: 6432

Built-in Symbol.asyncIterator in Array

According to MDN Web Docs:

There are currently no built-in JavaScript objects that have the [Symbol.asyncIterator] key set by default.

My question is how come this is working:

function promises() {
    return [
        new Promise(x => setTimeout(() => x(1), 1000)),
        new Promise(x => setTimeout(() => x(2), 2000)),
        new Promise(x => setTimeout(() => x(3), 3000)),
    ]
}

for await (x of promises()) console.log(x)

Upvotes: 0

Views: 590

Answers (1)

Bravo
Bravo

Reputation: 6263

MDN also states that

The for await...of statement creates a loop iterating over async iterable objects as well as on sync iterables, including: built-in String, Array, Array-like objects (e.g., arguments or NodeList), TypedArray, Map, Set, and user-defined async/sync iterables - MDN (emphasis mine)

Upvotes: 1

Related Questions