The Promise object is used for asynchronous computations. A Promise represents a value which may be available now, or in the future, or never.

ECMAScript6 JavaScript Promise

The Promise object is used for asynchronous computations. A Promise represents a value which may be available now, or in the future, or never.

ECMAScript6 JavaScript Promise

The Promise.all(iterable) method returns a promise that resolves when all of the promises in the iterable argument have resolved, or rejects with the reason of the first passed promise that rejects.

ECMAScript6 JavaScript Method Promise

The Promise.prototype property represents the prototype for the Promise constructor.

JavaScript Promise Property

The Promise.race(iterable) method returns a promise that resolves or rejects as soon as one of the promises in the iterable resolves or rejects, with the value or reason from that promise.

ECMAScript6 JavaScript Method Promise

The Promise.reject(reason) method returns a Promise object that is rejected with the given reason.

ECMAScript6 JavaScript Method Promise

The Promise.resolve(value) method returns a Promise object that is resolved with the given value. If the value is a thenable (i.e. has a "then" method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise the returned promise will be fulfilled with the value.

ECMAScript6 JavaScript Method Promise

When the reconnect(presentationId) method is called on a PresentationRequest presentationRequest, the user agent MUST run the following steps to reconnect to a presentation:

controlled presentations presentation identifier Promise

The catch() method returns a Promise and deals with rejected cases only. It behaves the same as calling Promise.prototype.then(undefined, onRejected).

ECMAScript6 JavaScript Method Promise Prototype

The then() method returns a Promise. It takes two arguments: callback functions for the success and failure cases of the Promise.

ECMAScript6 JavaScript Method Promise Prototype

API Experimental Interface Promise PromiseRejection Property Reference

API BODY Experimental Expérimental Fetch Guide HTTP Promise request Response

The promise-based startRendering() method of the OfflineAudioContext Interface starts rendering the audio graph, taking into account the current connections and the current scheduled changes.

API Audio Method OfflineAudioContext Promise Reference startRendering Web Audio API

The PromiseRejectionEvent.promise read-only property indicates the JavaScript Promise which has been rejected. You can examine the event's PromiseRejectionEvent.reason property to learn why the promise was rejected.

API events Events HTML DOM JavaScript Promise PromiseRejectionEvent Promises Property Reference