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Railsでの変数初期化 nilガード

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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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