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【Ruby】自己代入演算子「||=」

Posted at
hoge ||= 5

「||」演算子の自己代入演算子。hogeが偽か未定義ならhogeに5を代入する。
わかりやすく書き直すと↓

hoge = hoge || 5

hogeがfalse,nil以外 → 5を返す
hogeがfalse → hogeに5を代入する
hogeがnil(未定義) → hogeに5を代入する

##参考

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