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hrstt/ruby_hash_initial_block.rb

Created August 30, 2011 08:05
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Ruby: Hash初期化でブロックを利用．各要素に空配列を用意する
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ruby_hash_initial_block.rb
hash = Hash.new{|h,k| h[k] = []}
hash[:test] << "Hello" #=> {:test => ["Hello"]}
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