https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Global_Objects › Promise

L'objet Promise (pour « promesse ») est utilisé pour réaliser des traitements de façon asynchrone. Une promesse représente une valeur qui peut être disponible maintenant, dans le futur voire jamais. Note: Cette fonctionnalité est disponible via les Web Workers.

https://www.w3schools.com › Js › js_promise.asp

Here is how to use a Promise: myPromise.then ( function (value) { /* code if successful */ }, function (error) { /* code if some error */ } ); Promise.then () takes two arguments, a callback for success and another for failure. Both are optional, so you can add a callback for success or failure only.

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › Promise

Promises in JavaScript represent processes that are already happening, which can be chained with callback functions. If you are looking to lazily evaluate an expression, consider using a function with no arguments e.g. f = () => expression to create the lazily-evaluated expression, and f() to evaluate the expression immediately.

https://developer.mozilla.org › en-US › docs › Web › JavaScript › Guide › Using_promises

A Promise is an object representing the eventual completion or failure of an asynchronous operation. Since most people are consumers of already-created promises, this guide will explain consumption of returned promises before explaining how to create them.

https://javascript.info › promise-basics

The most important, fundamental one is .then. The syntax is: promise.then ( function (result) { /* handle a successful result */ }, function (error) { /* handle an error */ } ); The first argument of .then is a function that runs when the promise is resolved and receives the result.

https://fr.javascript.info › promise-basics

Une promesse (promise) est un objet spécial en JavaScript qui lie le “producteur de code” et le “consommateur de code” ensemble. En comparant à notre analogie c’est la “liste d’abonnement”.

https://javascript.info › promise-api

The syntax is: let promise = Promise.all(iterable); Promise.all takes an iterable (usually, an array of promises) and returns a new promise. The new promise resolves when all listed promises are resolved, and the array of their results becomes its result.

https://fr.javascript.info › promise-chaining

Lorsqu’un gestionnaire renvoie une valeur, cela devient le résultat de cette promesse. Le prochain .then est appelé avec. Une erreur classique pour les débutants: techniquement, nous pouvons également ajouter plusieurs .then à une seule promesse. Ceci n’est pas le chaînage des promesses. Par example :

https://web.dev › articles › promises

JavaScript Promises: an introduction. Stay organized with collections Save and categorize content based on your preferences. Promises simplify deferred and asynchronous computations. A promise represents an operation that hasn't completed yet. Jake Archibald. Developers, prepare yourself for a pivotal moment in the history of web development.

https://www.javascripttutorial.net › es6 › javascript-promises

JavaScript Promises. Summary: in this tutorial, you will learn about JavaScript promises and how to use them effectively. Why JavaScript promises. The following example defines a function getUsers() that returns a list of user objects: function getUsers() { return [ { username: 'john', email: 'john@test.com' },