reactjs.md

date	published	categories	tags
2023-09-08	true	notes	web development

ReactJS

React Hooks

General Rules

1. Functions must be pure (or at least functionally "pure").
2. Hooks must fire in the same order, every time.
3. Only call Hooks at the top level (in order to satisfy rule #2). Don’t call Hooks inside loops, conditions, or nested functions.

useState()

• State will be preserved between re-renders.
• Does not merge state values with the state setter! You need to merge on your own.
• The only argument is the initial state.
• Initial state is only set and executed on first render.
• Returns values in the order you initialized them, which is why the order of execution must not change.

useEffect()

useRef()