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RecoilのGetting StartedをJotaiに移植してみた

2 min read

Recoil版

RecoilのGetting Startedにシンプルなデモがあります。

import {
  RecoilRoot,
  atom,
  selector,
  useRecoilState,
  useRecoilValue
} from "recoil";

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

function TextInput() {
  const [text, setText] = useRecoilState(textState);
  return (
    <div>
      <input
        type="text"
        value={text}
        onChange={(event) => {
          setText(event.target.value);
        }}
      />
      <br />
      Echo: {text}
    </div>
  );
}

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}</>;
}

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

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

export default App;

Jotai版

同じものをjotaiで書き直してみました。

import { atom, useAtom } from "jotai";

const textAtom = atom("");

function TextInput() {
  const [text, setText] = useAtom(textAtom);
  return (
    <div>
      <input
        type="text"
        value={text}
        onChange={(event) => {
          setText(event.target.value);
        }}
      />
      <br />
      Echo: {text}
    </div>
  );
}

const charCountAtom = atom((get) => {
  const text = get(textAtom);
  return text.length;
});

function CharacterCount() {
  const [count] = useAtom(charCountAtom);
  return <>Character Count: {count}</>;
}

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

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

export default App;

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