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nextメソッドではなく、for of を使うこともできます。この場合はvがvalueキーの内容になります。
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この毎回 value = ary[i] というのを書くのが面倒です。逆に for of を使った場合にはインデックスがないので不便な時もあります(回避する方法としてentriesを使う手もあります)。
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コメントは受け付けていません。