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

    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. stackoverflow.com › questions › 50401390Promises/Fetch in JavaScript: how to extract text from text file

    May 18, 2018 · If you want the text of the response - you can .text() the Response objects to get a promise for that: Promise.all([. fetch('sample.txt').then(x => x.text()), fetch('sample2.txt').then(x => x.text()) ]).then(([sampleResp, sample2Resp]) => {. console.log(sampleResp); console.log(sample2Resp); });

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

    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.w3schools.com › Js › js_promiseJavaScript Promises - W3Schools

    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.

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

    Oct 7, 2024 · Promise.resolve() Returns a Promise object that is resolved with the given value. If the value is a thenable (i.e. has a then method), the returned promise will "follow" that thenable, adopting its eventual state; otherwise, the returned promise will be fulfilled with the value. Promise.try() Experimental.

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

    Jun 13, 2023 · Here are the topics we will cover: Why should you care about promises? What is a promise? How to create a promise in JavaScript. How to attach a callback to a promise. How to handle errors in a promise. How to handle many promises at once. What is the async/await syntax? How to create an async function in JavaScript. How to use the await keyword.

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  8. www.aleksandrhovhannisyan.com › blog › javascriptJavaScript Promises: Practical Use Cases and Examples

    Sep 12, 2020 · With ES2015, JavaScript finally introduced the Promise: an object that may or may not contain some value at some point in the future. Promises offer a powerful and legible syntax for writing asynchronous code in JavaScript. This post assumes a basic understanding of Promises and how they work.

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