mcdougald

Javascript Memo

Sources

• Arrayzing - The JavaScript array cheatsheet

Array

'Array.from(arrayLike, functionMap, thisArg)' (IE)

Create a new instance of 'Array' from an iterable or array-like object.

mcdougald

The Rules of React

All libraries have subtle rules that you have to follow for them to work well. Often these are implied and undocumented rules that you have to learn as you go. This is an attempt to document the rules of React renders. Ideally a type system could enforce it.

What Functions Are "Pure"?

A number of methods in React are assumed to be "pure".

On classes that's the constructor, getDerivedStateFromProps, shouldComponentUpdate and render.