What are promises in JavaScript? In which states can a promise be?
JavaScript's promises represent the eventual completion (or failure) of asynchronous operations and their resulting value.
JavaScript Promises
Working with promises in JavaScript is a great way to handle asynchronous operations, yet it can be confusing for many developers. This snippet collection covers the basics of promises and how to use them to handle everyday operations, as well as some more advanced topics.
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JavaScript · Asynchronous JavaScript Cheat Sheet
Learn everything you need to know about promises and asynchronous JavaScript with this handy cheatsheet.
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JavaScript · What is the difference between synchronous and asynchronous code in JavaScript?
Understanding the differences between synchronous and asynchronous code is a crucial piece of knowledge for every web developer.
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JavaScript · The order of then and catch matters
Messing up the order of chained
thenandcatchmethods in JavaScript promises can cause problems. Here's a short primer on the subject. -
JavaScript · What is the difference between then and finally in a JavaScript promise?
A JavaScript promise's
thenandfinallymethods seem very similar. But there are a few important differences you need to keep in mind. -
JavaScript · How can I add a timeout to a promise in JavaScript?
Oftentimes you might need to add a timeout to a promise in JavaScript. Learn how to do this and more in this short guide.
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JavaScript · Make a JavaScript function return a promise
Learn how to convert an asynchronous function to return a promise in JavaScript.
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JavaScript · Debounce a JavaScript function and return a promise
Easily create a debounced function that returns a promise.
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JavaScript · Run JavaScript promises in series
Learn how to resolve promises one after another (sequentially) in JavaScript.
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JavaScript · Asynchronous array loops in JavaScript
Asynchronously looping over arrays in JavaScript comes with a few caveats you should watch out for.
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JavaScript · Asynchronous function composition in JavaScript
Learn how to perform function composition for asynchronous functions.
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JavaScript · How can I implement a sleep function in JavaScript?
Learn how you can implement a delay function using
setTimeout(), promises andasync/await.