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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 · 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.

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

   www.w3schools.com › Js › js_promise

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   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.

3. 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.

4. www.w3schools.com › jsref › jsref_obj_promiseJavaScript Promise Object - W3Schools

   www.w3schools.com › jsref › jsref_obj_promise

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   The Promise Object represents the completion or failure of an asynchronous operation and its results. A Promise can have 3 states:

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

   javascript.info › promise-basics

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   Jun 23, 2024 · The promise object returned by the new Promise constructor has these internal properties: state — initially "pending" , then changes to either "fulfilled" when resolve is called or "rejected" when reject is called.

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

   www.freecodecamp.org › news › javascript-promise

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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.

7. People also ask

   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 the state of a promise object?

   • A promise object has a state that can be one of the following: In the beginning, the state of a promise is pending, indicating that the asynchronous operation is in progress. Depending on the result of the asynchronous operation, the state changes to either fulfilled or rejected.

   JavaScript Promises - JavaScript Tutorial

   www.javascripttutorial.net/es6/javascript-promises/

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   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 happens when a promise object is created?

   • Once a new Promise object is created, its state is pending. If a promise reaches fulfilled or rejected state, it is resolved. Note that you will rarely create promise objects in practice. Instead, you will consume promises provided by libraries. To get the value of a promise when it’s fulfilled, you call the then() method of the promise object.

   JavaScript Promises - JavaScript Tutorial

   www.javascripttutorial.net/es6/javascript-promises/

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   What happens if a promise object is pending?

   • 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. You must use a Promise method to handle promises.

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

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   How to demonstrate the use of promises in JavaScript?

   • To demonstrate the use of promises, we will use the callback examples from the previous chapter: ECMAScript 2015, also known as ES6, introduced the JavaScript Promise object. The following table defines the first browser version with full support for Promise objects:

   JavaScript Promises - W3Schools

   www.w3schools.com/Js/js_promise.asp

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8. www.javascripttutorial.net › es6 › javascript-promisesJavaScript Promises - JavaScript Tutorial

   www.javascripttutorial.net › es6 › javascript-promises

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   By definition, a promise is an object that encapsulates the result of an asynchronous operation. A promise object has a state that can be one of the following: Pending; Fulfilled with a value; Rejected for a reason; In the beginning, the state of a promise is pending, indicating that the asynchronous operation is in progress.