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2. People also ask

   What is a promise in Java?

   • A promise is an object returned by an asynchronous function, which represents the current state of the operation. At the time the promise is returned to the caller, the operation often isn't finished, but the promise object provides methods to handle the eventual success or failure of the operation.

   How to use promises - Learn web development | MDN - MDN Web Docs

   developer.mozilla.org/en-US/docs/Learn/JavaScript/Asynchronous/Promises

   See all results for this question

   How to use a promise method in JavaScript?

   • You must use a Promise method to handle promises. Here is how to use a Promise: 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. To demonstrate the use of promises, we will use the callback examples from the previous chapter:

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

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   What is a single Promise in JavaScript?

   • The single promise it returns is the first resolved promise in the input array. This method waits for any promise in the array to be resolved and would immediately return it as the output. From the above example, promise1 will resolve after 3 seconds, promise2 will resolve after 2 seconds, and promise3 immediately rejects.

   How Promises Work in JavaScript – A Comprehensive Beginner's Guide

   www.freecodecamp.org/news/guide-to-javascript-promises/

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   Are promises always part of JavaScript?

   • Promises were not always part of JavaScript. Callbacks worked together with asynchronous functions to produce desired results in the past. A callback is any function that is a parameter of an async function, which the async function invokes to complete its operation. To call an async function, you had to pass a callback as an argument like this:

   How Promises Work in JavaScript – A Comprehensive Beginner's Guide

   www.freecodecamp.org/news/guide-to-javascript-promises/

   See all results for this question

   What is a JavaScript promise object?

   • When the producing code obtains the result, it should call one of the two callbacks: A JavaScript Promise object can be: The Promise object supports two properties: state and result. While a Promise object is "pending" (working), the result is undefined. When a Promise object is "fulfilled", the result is a value.

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

   See all results for this question

   What is a promise at the end in JavaScript?

   • A promise at the end must have one of these results. In JavaScript, a Promise is an object that will produce a single value some time in the future. If the promise is successful, it will produce a resolved value, but if something goes wrong then it will produce a reason why the promise failed.

   How Promises Work in JavaScript – A Comprehensive Beginner's Guide

   www.freecodecamp.org/news/guide-to-javascript-promises/

   See all results for this question

3. developer.mozilla.org › en-US › docsPromise - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

   • Cached

   Oct 7, 2024 · 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.

4. developer.mozilla.org › en-US › docsUsing promises - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › en-US › docs

   • Cached

   Oct 7, 2024 · This second promise (promise2) represents the completion not just of doSomething(), but also of the successCallback or failureCallback you passed in — which can be other asynchronous functions returning a promise.

5. www.w3schools.com › Js › js_promiseJavaScript Promises - W3Schools

   www.w3schools.com › Js › js_promise

   • Cached

   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.

6. Videos

   • 

     11:31

     youtube.com

     JavaScript Promises In 10 Minutes

     17 Jan 2019

     1.8M views

   • 

     37:05

     youtube.com

     JavaScript Promises -- Tutorial for Beginners

     4 Oct 2022

     127.6K views

   • 

     12:37

     youtube.com

     What are JavaScript PROMISES? 🤞

     21 Dec 2023

     72K views

   View all

7. www.freecodecamp.org › news › guide-to-javascriptHow Promises Work in JavaScript – A Comprehensive Beginner's ...

   www.freecodecamp.org › news › guide-to-javascript

   • Cached

   Jun 13, 2023 · This article is an in-depth guide to promises in JavaScript. You are going to learn why JavaScript has promises, what a promise is, and how to work with it. You are also going to learn how to use async/await—a feature derived from promises—and what a job queue is. Here are the topics we will cover: Why should you care about promises?

8. developer.mozilla.org › Asynchronous › PromisesHow to use promises - Learn web development | MDN - MDN Web Docs

   developer.mozilla.org › Asynchronous › Promises

   • Cached

   Jul 25, 2024 · A promise is an object returned by an asynchronous function, which represents the current state of the operation. At the time the promise is returned to the caller, the operation often isn't finished, but the promise object provides methods to handle the eventual success or failure of the operation.

9. javascript.info › promise-apiPromise API - The Modern JavaScript Tutorial

   javascript.info › promise-api

   • Cached

   Feb 20, 2022 · 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]:

10. learnjavascript.online › topics › promisesPromises tutorial - Learn JavaScript

    learnjavascript.online › topics › promises

    • Cached

    Apr 9, 2024 · Promises were added to JavaScript back in 2015 and are now supported on more than 98% of browsers worldwide. A promise allows us to schedule work in the future and lets us handle its eventual success or failure. The code snippets below are taken from LearnJavaScript.online. Before learning about promises...