The Promise() constructor creates Promise objects. It is primarily used to wrap callback-based APIs that do not already support promises.
Description. A Promise is a proxy for a value not necessarily known when the promise is created. It allows you to associate handlers with an asynchronous action's eventual success value or failure reason.
https://developer.mozilla.org › fr › docs › Web › JavaScript › Reference › Global_Objects › Promise
Promise - JavaScript | MDN - MDN Web DocsL'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.
https://javascript.info › promise-basics
Promise - The Modern JavaScript TutorialThe function passed to new Promise is called the executor. When new Promise is created, the executor runs automatically. It contains the producing code which should eventually produce the result. In terms of the analogy above: the executor is the “singer”.
https://learnjavascript.online › topics › promises.html
Promises tutorial | Learn JavaScriptSo, what are promises in JavaScript? A promise is an object that represents the eventual completion or failure of an asynchronous operation. You create that object with the new Promise() constructor. A promise lets us handle the eventual success or failure of an asynchronous operation with the .then() and .catch() callback methods respectively.
https://runebook.dev › fr › docs › javascript › global_objects › promise › promise
JavaScript - Promise.promise [fr] - Runebook.devLe constructeur Promise () crée des objets Promise . Il est principalement utilisé pour encapsuler les API basées sur les rappels qui ne prennent pas déjà en charge les promesses. Try it. Syntax. js. newPromise (executor) Remarque : Promise () ne peut être construit qu'avec new . Tenter de l'appeler sans new génère un TypeError . Parameters.
https://masteringjs.io › tutorials › fundamentals › promise-create
JavaScript Create Promise - Mastering JSJavaScript Create Promise. Mar 27, 2020. In general, there are 4 ways to create a new promise in JavaScript: Using the Promise constructor. Using the static helpers Promise.resolve() and Promise.reject() Chaining with the then() function or catch() function. Call an async function. Using the Promise Constructor.
JavaScript Guide. Using promises. In This Article. A Promise is an object representing the eventual completion or failure of an asynchronous operation. A promise may be created using its constructor. However, most people are consumers of already-created promises returned from functions.
https://masteringjs.io › tutorials › fundamentals › promise-new
Understanding `new Promise` in JavaScript - Mastering JSThe Promise constructor takes a single parameter, an executor function. JavaScript then executes your executor function with 2 arguments: resolve() and reject(). function executor(resolve, reject) { typeof resolve; // 'function' typeof reject; // 'function' . } new Promise(executor);
https://www.freecodecamp.org › news › how-javascript-promises-actually-work-from-the...
How JavaScript promises actually work from the inside outLater doResolve(executor, this) is invoked with executor and promise object. Let’s move on to the definition of doResolve and see how it’s implemented. /** * Take a potentially misbehaving resolver function and make sure * onFulfilled and onRejected are only called once.
