With the arrival of CoffeeScript and CoffeeScript source maps, it's now possible to code sophisticated applications without touching a single line of JavaScript. No doubt some people are pretty happy with that, but there's probably a few who will still want to get under the hood and understand what's going on behind all this magical obfuscation.
I'm one such person and as a recent coding exercise I started recreating common libraries functions from scratch; I found it really useful to clarify my understanding. My aim is to add snippets as I go about my daily work and explain each snippet from first principles in a way that would allow someone fairly new to programming JavaScript to understand.
I hope this is useful to someone! Let me know if you'd like me to delve into a particular library or method.
Tip: understanding JavaScript's call and apply is critical to getting to the bottom of many of these functions. The best explanation I've seen is Yahuda Katz' excellent blog post Understanding JavaScript Function Invocation and “this” - I strongly recommend it.
_.bind[coming soon]_.bindAll[coming soon]
Please feel free to make comments and amend. This is a work in progress and I've not necessarily checked all the code compiles and is free of typos.
- CoffeeScript
extends - CoffeeScript loops and comprehensions, in particular the brackets in
count = (num for num in [10..1]) - Start tackling jQuery