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Comparison of the amount of code with and without using constate #4

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merged 1 commit into from
Nov 9, 2022
Merged

Comparison of the amount of code with and without using constate #4

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1 change: 1 addition & 0 deletions react-context-constate-sandbox/package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,7 @@
"@testing-library/jest-dom": "^5.14.1",
"@testing-library/react": "^13.0.0",
"@testing-library/user-event": "^13.2.1",
"constate": "^3.3.2",
"react": "^18.2.0",
"react-dom": "^18.2.0",
"react-scripts": "5.0.1",
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35 changes: 9 additions & 26 deletions react-context-constate-sandbox/src/DivideContextWithConstate.jsx
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Original file line number Diff line number Diff line change
@@ -1,8 +1,5 @@
import { createContext, useCallback, useContext, useState } from "react";

// Context を、参照が変更する　count用 と 参照が変わらない increment 関数用の２つ作成する
const CountContext = createContext({});
const IncrementContext = createContext({});
import constate from "constate";
import { useCallback, useState } from "react";

// countと、increment を定義して返却するカスタムフックス
function useCounter({ initialCount = 0 } = {}) {
Expand All @@ -11,25 +8,11 @@ function useCounter({ initialCount = 0 } = {}) {
return { count, increment };
}

// ２つのプロバイダーをネストして１つのプロバイダーにする
const CounterProvider = ({ children, initialCount }) => {
const { count, increment } = useCounter({ initialCount });
return (
<CountContext.Provider value={count}>
<IncrementContext.Provider value={increment}>
{children}
</IncrementContext.Provider>
</CountContext.Provider>
);
};

const useCount = () => {
return useContext(CountContext);
};

const useIncrement = () => {
return useContext(IncrementContext);
};
const [CounterProvider, useCount, useIncrement] = constate(
useCounter,
(value) => value.count,
(value) => value.increment
);

// ボタンコンポーネント
function IncrementButton() {
Expand All @@ -45,7 +28,7 @@ function Count() {
return <span>{count}</span>;
}

function DivideContext() {
function DivideContextWithConstate() {
return (
<CounterProvider initialCount={1}>
<Count />
Expand All @@ -54,4 +37,4 @@ function DivideContext() {
);
}

export default DivideContext;
export default DivideContextWithConstate;
5 changes: 5 additions & 0 deletions react-context-constate-sandbox/src/index.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import React from "react";
import ReactDOM from "react-dom/client";
import DivideContext from "./DivideContext";
import DivideContextWithConstate from "./DivideContextWithConstate";
import OneContext from "./OneContext";
import OneContextWithReducer from "./OneContextWithReducer";

Expand All @@ -21,5 +22,9 @@ root.render(
useState（ボタンをクリックすると、1つのコンポーネントのみレンダリングされる）
</h2>
<DivideContext />
<h2>
constateを使用（ボタンをクリックすると、1つのコンポーネントのみレンダリングされる）
</h2>
<DivideContextWithConstate />
</React.StrictMode>
);
5 changes: 5 additions & 0 deletions react-context-constate-sandbox/yarn.lock
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Original file line number Diff line number Diff line change
Expand Up @@ -3178,6 +3178,11 @@ connect-history-api-fallback@^2.0.0:
resolved "https://registry.yarnpkg.com/connect-history-api-fallback/-/connect-history-api-fallback-2.0.0.tgz#647264845251a0daf25b97ce87834cace0f5f1c8"
integrity sha512-U73+6lQFmfiNPrYbXqr6kZ1i1wiRqXnp2nhMsINseWXO8lDau0LGEffJ8kQi4EjLZympVgRdvqjAgiZ1tgzDDA==

constate@^3.3.2:
version "3.3.2"
resolved "https://registry.yarnpkg.com/constate/-/constate-3.3.2.tgz#a6cd2f3c203da2cb863f47d22a330b833936c449"
integrity sha512-ZnEWiwU6QUTil41D5EGpA7pbqAPGvnR9kBjko8DzVIxpC60mdNKrP568tT5WLJPAxAOtJqJw60+h79ot/Uz1+Q==

content-disposition@0.5.4:
version "0.5.4"
resolved "https://registry.yarnpkg.com/content-disposition/-/content-disposition-0.5.4.tgz#8b82b4efac82512a02bb0b1dcec9d2c5e8eb5bfe"
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