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

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   Oct 7, 2024 · 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.

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

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   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. When a Promise object is "rejected", the result is an error object.

3. developer.mozilla.org › docs › LearnHow to use promises - Learn web development | MDN - MDN Web Docs

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   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.

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

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   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?

5. www.freecodecamp.org › news › the-javascriptHow JavaScript Promises Work – Handbook for Beginners

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   Feb 13, 2024 · How JavaScript Promises Work – Handbook for Beginners. Many operations, such as network requests, are asynchronous in nature. One of the most useful and powerful tools for working with asynchronous code is the Promise. In this handbook, you'll learn all about JavaScript Promises and how to use them.

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

   developer.mozilla.org › en-US › docs

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   Oct 7, 2024 · A promise is said to be settled if it is either fulfilled or rejected, but not pending. You will also hear the term resolved used with promises — this means that the promise is settled or "locked-in" to match the eventual state of another promise, and further resolving or rejecting it has no effect.

7. People also ask

   What is a promise in JavaScript?

   • A Promise contains both the producing code and calls to the consuming code: 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.

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

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   What is a promise object?

   • The Promise object represents the eventual completion (or failure) of an asynchronous operation and its resulting value. To learn about the way promises work and how you can use them, we advise you to read Using promises first. A Promise is a proxy for a value not necessarily known when the promise is created.

   Promise - JavaScript | MDN - MDN Web Docs

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

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   How to resolve a promise in JavaScript?

   • Promise.any() accepts an array of Promises as an argument but returns a single Promise as the output. 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.

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

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

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   What is a sequence of promises in JavaScript?

   • Promise.allSettled () is another composition tool that ensures all operations are complete before resolving. These methods all run promises concurrently — a sequence of promises are started simultaneously and do not wait for each other. Sequential composition is possible using some clever JavaScript:

   Using promises - JavaScript | MDN - MDN Web Docs

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

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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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   What is the difference between a fan and a promise in JavaScript?

   • That’s a “singer”. A “consuming code” that wants the result of the “producing code” once it’s ready. Many functions may need that result. These are the “fans”. A promise is a special JavaScript object that links the “producing code” and the “consuming code” together. In terms of our analogy: this is the “subscription list”.

   Promise - The Modern JavaScript Tutorial

   javascript.info/promise-basics

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8. javascript.info › promise-basicsPromise - The Modern JavaScript Tutorial

   javascript.info › promise-basics

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   Jun 23, 2024 · A promise is a special JavaScript object that links the “producing code” and the “consuming code” together. In terms of our analogy: this is the “subscription list”. The “producing code” takes whatever time it needs to produce the promised result, and the “promise” makes that result available to all of the subscribed code when it’s ready.