Write Your Own Node.js Promise Library from Scratch

Promises are the preferred async primitive in JavaScript. Callbacks are becoming increasingly uncommon, especially now that async/await is available in Node.js. Async/await is based on promises, so you need to understand promises to master async/await. In this article, I’ll walk you through writing your own promise library and demonstrate using it with async/await.

http://thecodebarbarian.com/write-your-own-node-js-promise-library-from-scratch.html

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