More than 5 years have passed since last update.

手元に配列がないけどmapを使いたい時

JavaScript
map
es2015

Last updated at 2017-11-07Posted at 2017-11-07

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

You get articles that match your needs
You can efficiently read back useful information
You can use dark theme

What you can do with signing up