React Hooks experimental repo

Folders

• useState
• useEffect
• useContext, old-style Context-Consumer
• useReducer, useEffect, useState, useContext
• useCallback, memo(Component)
• useMemo
• useRef
• custom hooks: counter, form

Notes

• useMemo vs. useCallback
  • useMemo calls the function and returns its result/value (if you want to use the result). The value will be cached and recomputed only if the dependencies change.
  • While useCallback returns the function without calling it (reference equality is important for child rerender; if you want to use function as callback). The function will be cached.
• memo vs. PureComponent
  • memo checks for prop changes for rerender, PureComponent implements shouldComponentUpdate
• useRef
  • Stores immutable data between renders