Introduction to React Hooks
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This document introduces React hooks, which are functions that allow you to "hook into" React features like state and lifecycle methods from function components. The main hooks discussed are useState, which allows adding local state to function components, and useEffect, which allows performing side effects from functions. Rules for using hooks properly are also covered.
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A step towards the way you write the code in React application.In this presentation, I have given introduction about React hooks. Why we need it in our react applications and describe about the two most commonly used React Hooks API useState and useEffect. I also given the links of code snippets I added in these slides
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- 1. INTRODUCTIONTO REACT HOOKS Felicia O’Garro | Code Crew | March 25, 2021
- 2. WHAT ARE REACT HOOKS? • New addition in React 16. 8 • Functions that let you “hook into” React features from function component s • They don’t work inside of classe s • No breaking changes or rewrite s • You can build your own
- 3. REACT HOOKS API • useStat e • useEffec t • useContex t • useReduce r • useCallbac k • useMem o • useRe f • useImperativeHandl e • useLayoutEffec t • useDebugValue
- 4. WHY HOOKS? • Allows you to reuse stateful logic without changing your component hierarchy • Allows you to break larger components down to smaller function s • You can use more of React features without using classes
- 5. STATE IN CLASS COMPONENTS
- 6. USE STATE • Used to add local state to a function component • State is preserved during re-render s • Returns the current state value and a function that lets you update it
- 7. ARRAY DESTRUCTURING • Allows us to assign different names to the state variables declared by calling useStat e • Extract representations from the data fed into layers
- 8. USE STATE IN ACTION
- 9. USE EFFECT • Adds the ability to perform side effects from a functio n • Serves the same purpose as certain lifecycle hooks
- 10. LIFECYLE METHODS
- 11. SIDE EFFECTS IN CLASS COMPONENTS
- 12. EFFECTS RENDERING • [] - only run during initial rende r • nothing - run during initial render and after every re-rende r • [data] - run at initial render and after every re-render if data has changed since the last re-render
- 13. USE EFFECT IN ACTION
- 14. RULES OF HOOKS • Only call Hooks at the top level • Only call Hooks from React functional component s • ESLint con fi guration
- 16. RESOURCES • React Docs • Modern React with Redux Course • Full React Course 2020 • React Lifecycle Methods Diagram
- 17. THANKS MUCH!!!