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Recoil & React official state management

Redux

Recoil.js

https://recoiljs.org/

A state management library for React

$ npx create-react-app my-app

$ npm init react-app my-app

$ yarn create react-app my-app
$ yarn add recoil

https://github.com/facebook/create-react-app#creating-an-app

RecoilRoot

import React from 'react';
import {
  RecoilRoot,
  atom,
  selector,
  useRecoilState,
  useRecoilValue,
} from 'recoil';

function App() {
  return (
    <RecoilRoot>
      <CharacterCounter />
    </RecoilRoot>
  );
}

Atom

const textState = atom({
  key: 'textState', // unique ID (with respect to other atoms/selectors)
  default: '', // default value (aka initial value)
});

function CharacterCounter() {
  return (
    <div>
      <TextInput />
      <CharacterCount />
    </div>
  );
}

function TextInput() {
  const [text, setText] = useRecoilState(textState);

  const onChange = (event) => {
    setText(event.target.value);
  };

  return (
    <div>
      <input type="text" value={text} onChange={onChange} />
      <br />
      Echo: {text}
    </div>
  );
}

Selector

const charCountState = selector({
  key: 'charCountState', // unique ID (with respect to other atoms/selectors)
  get: ({get}) => {
    const text = get(textState);

    return text.length;
  },
});

function CharacterCount() {
  const count = useRecoilValue(charCountState);

  return <>Character Count: {count}</>;
}

refs

https://mp.weixin.qq.com/s/EWcTOB08oU96OcQ-41FbPA

Recoil === 畏缩 / 后坐力

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