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Kaggleや論文も評価される「SIGNATE Delta」とは詳しくはこちら
longtime1116@longtime1116
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Ruby で hash の配列から、特定の key の value のみの配列を作成する

Ruby
More than 3 years have passed since last update.

やりたいこと

hoge = [{a: 1, b: 2}, {a: 3, b: 4}]

から、

[1, 3]

を作る。

やり方

hoge.map { |h| h[:a] }

こんな簡単に実現できるとは思わなかった。。。情けない。

Edit request
22
longtime1116
@longtime1116
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