# React Hooks
- useState
```js
const [filter, setFilter] = useState('')
```
- useEffect
```js
useEffect(() => { return willUnmountCallback }, []) // '[]' prevents 'fn' from running on update. Executes on mount and willUnmount
```
- useReducer
```js
const [state, setState] = useReducer((state, newState) => ({ ...state, ...newState }), initialState)
```
- useContext
```js
const { logout } = useContext(GitHubContext)
```

## Lazy and Suspense
```js
React.lazy(() => <Component />) // Must have <Suspense> as HOC
```