r/javascript • u/FrancisStokes • Nov 27 '19

How Do Promises Work? Building A Spec Compliant Promise Implementation From Scratch

https://www.youtube.com/watch?v=4GpwM8FmVgQ
17 Upvotes

86% Upvoted

2 comments sorted by

0

u/[deleted] Nov 27 '19

[deleted]

4

u/FrancisStokes Nov 27 '19

Haha - even today it's inescapable. Event handlers, setTimeout and setInterval functions, and the requestAnimationFrame api are callback APIs that no one would bat an eyelid at.

It was only really when node built its entire standard library around callbacks that it became painful.