回答編集履歴
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Object\.assign, Function#apply 版コード追記
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**(2016/02/21 01:57追記)**
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`Array.prototype.reduce` は不要でしたね。
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```JavaScript
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Object.assign.apply(null, list);
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```
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- [Object.assign() - JavaScript | MDN](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
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- [Array.prototype.reduce() - JavaScript | MDN](https://developer.mozilla.org/ja/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce)
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