JavaScript Promises: Zero To Hero Plus Cheat Sheet

Joshua Saunders
DailyJS
Published in
6 min readOct 9, 2019

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Photo by JJ Ying on Unsplash

It’s time, friend.

Maybe you’re new to web and trying to pick up the latest front-end tech, or maybe you’re a seasoned web developer, but have just been putting off fully understanding promises. async/await is a fresh take on asynchronous JavaScript, but it’s built upon promises, so it’s well worth understanding promises before getting into async/await .

Promises truly aren’t complicated but it can be hard breaking into them. This is because promises are their own type of design pattern — they may be a new paradigm to you in the same way that functional React components can seem foreign to those coming from an object-oriented background.

Luckily for you, my growing pains of learning JavaScript promises are still fresh in my memory and hopefully I can help you get through yours as fast as possible!

Quick question though — did you come here looking for async/await ? If you did, here’s a companion article on async/await !

Without further ado, Promises!

What The Heck Is A…

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Joshua Saunders
DailyJS

Senior software developer at Klipfolio. I love writing about all things dev and faith. linkedin.com/in/jksaunders to connect!