feat(loop): for文とforEach #80
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| 一方、反復処理の多くは、配列に入れた値を処理する方法と言い換えることができます。 | ||
| そのため、JavaScriptの配列である`Array`オブジェクトには反復処理をするためのメソッドが備わっています。 | ||
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| `array.forEach(コールバック関数)`もそのひとつです。 |
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ここで書きたい事を簡単に書くと
- for文の書き方 は 他の言語と同じ
- for文でやりたいことはArrayメソッドでできる
forEachで for文と同じことをする
In advanced
- reduce を使ってやる方法
- letを使わないで書く方法
という感じだと思う。
| 一方、反復処理の多くは、配列に入れた値を処理する方法と言い換えることができます。 | ||
| そのため、JavaScriptの配列である`Array`オブジェクトには反復処理をするためのメソッドが備わっています。 | ||
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| ## Array.prototype.forEach |
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for文とforEachのみにして、reduceは欄外に移した
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| [import, sum-for-example.js](./src/sum-for-example.js) | ||
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| 一方、反復処理の多くは、配列に入れた値を処理する方法と言い換えることができます。 |
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reduceについては欄外にとりあえず残したままだけど後で考える |
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#68 のfor文のみ