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  1. stackoverflow.com › questions › 41203409javascript - reading file with ES6 promises - Stack Overflow

    Dec 17, 2016 · You'll want to wrap the entire fs.readFile invocation inside a new Promise, and then reject or resolve the promise depending on the callback result: return new Promise(function(resolve, reject){. fs.readFile(fileName, type, (err, data) => {. err ? reject(err) : resolve(data);

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  3. stackoverflow.com › questions › 34495796Javascript Promises with FileReader () - Stack Overflow

    Dec 28, 2015 · Using promises, you'd start with a promise wrapper for readAsDataURL (I'm using ES2015+ here, but you can convert it to ES5 with a promise library instead): return new Promise((resolve, reject) => {. const fr = new FileReader(); fr.onerror = reject; fr.onload = () => {. resolve(fr.result); fr.readAsDataURL(file); });

  4. kanhaji.medium.com › read-files-in-javascript-likeRead Files in JavaScript like a hero you are, with Async/Await

    May 16, 2024 · So, whether you’re organizing a library of files or building the next big thing, mastering async file handling can level up your JavaScript game. Ready to dive in? Let’s explore sequential...

    • Kanhaji

  5. www.digitalocean.com › community › tutorialsHow To Read and Process Files with the JavaScript FileReader ...

    Apr 22, 2021 · Prerequisites. If you would like to follow along with this article, you will need: An understanding of JavaScript methods, EventListener, and Promises will be helpful. A code editor. A modern web browser that supports File, FileReader, and FileReaderSync. Uploading a File. First, to get a file from a user, we need to use an <input> element:

  6. dev.to › alexmercedcoder › understanding-javascriptUnderstanding JavaScript Promises In-Depth - DEV Community

    Feb 3, 2024 · A Promise in JavaScript represents the eventual completion (or failure) of an asynchronous operation and its resulting value. A promise can be in one of three states: Pending: The initial state, where the operation has not completed yet. Fulfilled: The operation completed successfully. Rejected: The operation failed. Structure of a Promise.

    • Alex Merced

  7. 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.

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  9. francisco.io › blog › promises-and-streams-in-javascriptPromises and Streams in Javascript — Francisco Presencia

    May 19, 2022 · Let's explore this topic in a practical way! I want a function that reads a file and another that writes a file. But files can be small or big, text or binary, so we want to allow them to read the whole file at once with a promise, or pipe it to another file in chunks. The API should look like:

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