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prom· ise ˈprä-məs. Synonyms of promise. 1. a. : a declaration that one will do or refrain from doing something specified. b. : a legally binding declaration that gives the person to whom it is made a right to expect or to claim the performance or forbearance of a specified act. 2. : reason to expect something.
Thesaurus: synonyms, antonyms, and examples. to promise someone something. promise I promise that I'll be home before dark. guarantee I can't guarantee that the operation will be successful. give (someone) your word He gave me his word that the job would be finished on time.
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.
Jun 9, 2024 · We will use the following terminology: initial promise is the promise on which then is called; new promise is the promise returned by then. The two callbacks passed to then are called fulfillment handler and rejection handler , respectively.
In the above program, a Promise object is created that takes two functions: resolve() and reject() . resolve() is used if the process is successful and reject() is used when an error occurs in the promise. The promise is resolved if the value of count is true. Working of JavaScript promise.
Promise definition: a declaration that something will or will not be done, given, etc., by one. See examples of PROMISE used in a sentence.
Jun 9, 2024 · There are four composition tools for running asynchronous operations concurrently: Promise.all(), Promise.allSettled(), Promise.any(), and Promise.race(). We can start operations at the same time and wait for them all to finish like this:
Jan 15, 2020 · A Promise is an object that represents the eventual completion (or failure) of an asynchronous operation, and its resulting value. var promise = new Promise(function(resolve, reject) { // do thing, then… if (/* everything worked */) { resolve("See, it worked!"); } else { reject(Error("It broke")); } });
Feb 20, 2022 · 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. For instance, the Promise.all below settles after 3 seconds, and then its result is an array [1, 2, 3]:
What is a promise? The core idea behind promises is that a promise represents the result of an asynchronous operation. A promise is in one of three different states: pending - The initial state of a promise. fulfilled - The state of a promise representing a successful operation. rejected - The state of a promise representing a failed operation.
