回答編集履歴
1
サンプルコードの追加
test
CHANGED
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@@ -51,3 +51,117 @@
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無駄に複雑にしている気がするので上の問題をまずクリアしてみてください。
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---
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自分なら以下のようにします。解説が必要でしたらそのように言ってください。
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[https://codepen.io/og24715/pen/VBwdEx?editors=0010](https://codepen.io/og24715/pen/VBwdEx?editors=0010)
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```js
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class Select extends React.Component {
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state = {
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items: [{
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id: 1,
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name: 'React',
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chosen: false,
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}, {
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id: 2,
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name: 'Redux',
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chosen: false,
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}]
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}
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_handleClick = id => event => {
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const items = [...this.state.items];
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const item = this.state.items.find(item => item.id === id);
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item.chosen = !item.chosen;
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this.setState({ items });
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};
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render() {
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return (
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<ItemList
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items={this.state.items}
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handleClick={this._handleClick}
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/>
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)
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}
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}
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const ItemList = ({ items, handleClick }) => (
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items.map(item => (
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<Item
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key={item.id}
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item={item}
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handleClick={handleClick}
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/>
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))
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);
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const Item = ({ item, handleClick }) => (
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<button
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onClick={handleClick(item.id)}
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>
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{item.chosen && '✔ '}
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{item.name}
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</button>
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);
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```
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