こう書けばいいみたい。なるほどね。（for使えの突っ込みはなしで
）
Array.apply(null, { length: 3 }).map(function (elm, index) {
console.log('出力', elm, index)
})
// 出力 undefined 0
// 出力 undefined 1
// 出力 undefined 2
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手元に配列がないけどmapを使いたい時
Last updated at Posted at 2017-11-07
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