JavaScript · Async JavaScript

Promise

Represents a future value. Resolve with a value or reject with an Error.

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Syntax

new Promise((resolve, reject) => { … })

Example

Try it

const wait = ms => new Promise(resolve => setTimeout(resolve, ms));
wait(10).then(() => console.log("done"));

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.