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Ruby - ハッシュの初期値を配列にする

Last updated at Posted at 2022-08-02
example_hash = Hash.new{|hash, key| hash[key] = []}

ハッシュの要素にいきなり配列としてpush出来たりする

example_hash["foo"].push "bar"

example_hash # => {"foo"=>["bar"]}

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