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Railsでの変数初期化　nilガード

RubyRails
More than 5 years have passed since last update.
a ||= []

aがnilなら[]を初期値として、nilでないならばaとする

いつかどこかで解説を見た気がしたけれど、"||="ではググれないのでメモ
いま解説をメタプログラミングRubyで見つけたので
次から忘れたら"nilガード"でググろう

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