React hooks beyond hype
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React hook is a new feature that enables us to use state and others react functionalities without writing class.
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React hooks beyond hype
- 1. Re c ok y h e
- 2. @dielduarte
- 4. What kind of problems do hooks solve? Reusing logic Huge components Confusing classes
- 6. How we were solving these problems before hooks?
- 7. Higher order components Concretely, a higher-order component is a function that takes a component and returns a new component.
- 9. Render props A component with a render prop takes a function that returns a React element and calls it instead of implementing its own render logic.
- 15. Reusing logic Huge components Confusing classes
- 16. recompose Recompose is a React utility belt for function components and higher-order components https://codesandbox.io/s/yqy23w3nmj
- 17. A Note from the Author (acdlite, Oct 25 2018): Hi! I created Recompose about three years ago. About a year after that, I joined the React team. Today, we announced a proposal for Hooks. Hooks solves all the problems I attempted to address with Recompose three years ago, and more on top of that. I will be discontinuing active maintenance of this package (excluding perhaps bugfixes or patches for compatibility with future React releases), and recommending that people use Hooks instead. Your existing code with Recompose will still work, just don't expect any new features. Thank you so, so much to @wuct and @istarkov for their heroic work maintaining Recompose over the last few years. Read more discussion about this decision here.
- 20. What kind of problems do hooks solve? Reusing logic Huge components Confusing classes Wrapper hell
- 21. Hooks Hooks are an upcoming feature that lets you use state and other React features without writing a class
- 22. Basic Hooks ➔ useState ➔ useEffect ➔ useContext Additional Hooks ➔ useReducer ➔ useCallback ➔ useMemo ➔ useRef ➔ useImperativeHandle ➔ useLayoutEffect ➔ useDebugValue
- 23. const [value, fn] => useState() https://codesandbox.io/s/l20l00nqz7
- 27. useEffect(() => fn(), array) https://codesandbox.io/s/9zp9nvxkzr
- 28. useEffect() It’s executed after all renders if returns a function, that function is called in the unmount time can receive an array as a second param, and when with that, the effect is just called after the first render if the values passed changed. Also, if passed an empty array, the effect will be called just one time.
- 29. useEffect() can be used to replace componentDidMount, componentDidUpdate and componentWillUnMount if you are working with visual DOM manipulations, use useLayoutEffect instead, useLayoutEffect runs synchronously before the paint process of the browser
- 31. const context = useContext(contextObj) https://codesandbox.io/s/zn1ml0o4m4
- 33. Custom Hooks Custom Hooks lets you extract component logic into reusable functions.
- 40. Rules of Hooks
- 41. Only Call Hooks at the Top Level Don’t call Hooks inside loops, conditions, or nested functions
- 42. Only Call Hooks from React Functions Don’t call Hooks from regular JavaScript functions.
- 44. How hooks works? super high level explanation
- 45. First render 0 value 1 value 2 value useState() useEffect() useContext()
- 46. Next render 0 value 1 value 2 value useState() useContext()
- 47. Write components with class, high order components and render props Write components with hooks
- 48. Questions?