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1. developer.mozilla.org › Global_Objects › PromisePromise - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › Global_Objects › Promise

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   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.

2. developer.mozilla.org › Guide › Using_promisesUsing promises - JavaScript | MDN - MDN Web Docs

   developer.mozilla.org › Guide › Using_promises

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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.

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

   developer.mozilla.org › Asynchronous › Promises

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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. devdoc.net › docs › WebUsing promises - JavaScript | MDN

   devdoc.net › docs › Web

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   Jul 21, 2017 · 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.

5. 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.

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

   javascript.info › promise-api

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   Promise API. There are 6 static methods in the Promise class. We’ll quickly cover their use cases here. Promise.all. Let’s say we want many promises to execute in parallel and wait until all of them are ready. For instance, download several URLs in parallel and process the content once they are all done. That’s what Promise.all is for.

7. 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

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   What is a JavaScript promise?

   • 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. The analogy isn’t terribly accurate, because JavaScript promises are more complex than a simple subscription list: they have additional features and limitations.

   Promise - The Modern JavaScript Tutorial

   javascript.info/promise-basics

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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 create a promise-based alternative?

   • Create a promise-based alternative. The function delay(ms) should return a promise. That promise should resolve after ms milliseconds, so that we can add .then to it, like this: Rewrite the showCircle function in the solution of the task Animated circle with callback so that it returns a promise instead of accepting a callback. The new usage:

   Promise - The Modern JavaScript Tutorial

   javascript.info/promise-basics

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   What is a promise based API?

   • The function returns immediately and calls your callback when the operation is finished. With a promise-based API, the asynchronous function starts the operation and returns a Promise object. You can then attach handlers to this promise object, and these handlers will be executed when the operation has succeeded or failed.

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

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

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   Does JavaScript have a promise API?

   • This is happening already with Quota Management, Font Load Events, ServiceWorker, Web MIDI, Streams, and more. The JavaScript promises API will treat anything with a then() method as promise-like (or thenable in promise-speak sigh), so if you use a library that returns a Q promise, that's fine, it'll play nice with the new JavaScript promises.

   JavaScript Promises: an introduction | Articles | web.dev

   web.dev/articles/promises

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8. web.dev › articles › promisesJavaScript Promises: an introduction | Articles | web.dev

   web.dev › articles › promises

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   Dec 16, 2013 · You can find the details in MDN's Promise and async function reference. Many thanks to Anne van Kesteren, Domenic Denicola, Tom Ashworth, Remy Sharp, Addy Osmani, Arthur Evans, and Yutaka Hirano who proofread this and made corrections/recommendations.