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

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   A Promise is an Object that links Producing code and Consuming code. JavaScript Promise Object. A Promise contains both the producing code and calls to the consuming code: Promise Syntax. let myPromise = new Promise (function(myResolve, myReject) { // "Producing Code" (May take some time) myResolve (); // when successful. myReject (); // when error

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

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   Oct 7, 2024 · 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. Description. A Promise is a proxy for a value not necessarily known when the promise is created.

3. www.geeksforgeeks.org › javascript-promiseJavaScript Promise - GeeksforGeeks

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   Oct 9, 2024 · What is a Promise? A promise in JavaScript is like a container for a future value. It is a way of saying, “I don’t have this value right now, but I will have it later.” Imagine you order a book online. You don’t get the book right away, but the store promises to send it to you.

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4. developer.mozilla.org › Guide › Using_promisesUsing 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.

5. www.freecodecamp.org › news › javascript-promiseHow JavaScript Promises Work – Tutorial for Beginners

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   Nov 29, 2023 · Basically, a Promise object represents a “pending state” in the most common sense: the promise will eventually be fulfilled at a later date. To give you an illustration, suppose you want to buy a new phone to replace your old phone, so you open a messaging app to contact a phone store.

6. 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.

7. People also ask

   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

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   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 are the properties of a promise object?

   • 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. You cannot access the Promise properties state and result.

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

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   What is a promise in MDN?

   • Learn how to contribute. This page was last modified on Jul 26, 2024 by MDN contributors. Mozilla ads Don't want to see ads? A Promise is an object representing the eventual completion or failure of an asynchronous operation.

   Using promises - JavaScript | MDN - MDN Web Docs

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

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   How does a promise work?

   • You don’t get the book right away, but the store promises to send it to you. While you wait, you can do other things, and when the book arrives, you can read it. In the same way, a promise lets you keep working with your code while waiting for something else to finish, like loading data from a server.

   JavaScript Promise - GeeksforGeeks

   www.geeksforgeeks.org/javascript-promise/

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   What is a new promise in JavaScript?

   • The 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”. Its arguments resolve and reject are callbacks provided by JavaScript itself.

   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.