Uploaded August 2014 | Updated September 2026, 1 week ago

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The 4 levels of clean JS ASync programming: Javascript programming can get really ugly, really fast...but not if you know how to avoid "callback hell".

Code available here: plnkr.co/edit/1ArvFxI0gWmajTpDaOSB?p=preview

Also watch this video - ES6 Generators
youtube.com/watch?v=QO07THdLWQo

Level one: Programming with callbacks - you make it work, but it's ugly
Level two: Programming with abstracted callbacks - cleaner for sure, but still messy and way too much repeated code
Level three: Promises - much cleaner much more stable code, but still not as enjoyable as code should be
Level four: Generators - life is good.

This is a javascript promises tutorial / javascript generators tutorial. We're going to show the four levels and why each level is better than the one before it. Along the way, you should learn a decent bit about promises, and even some about generators.

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Also watch: "Responsive Design Tutorial - Tips for making web sites look great on any device"
youtube.com/watch?v=fgOO9YUFlGI
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