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RubyのProcは「関数」としてブロックを取れるか?

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結論。驚くべきことに、Procオブジェクトは「関数」と見做してブロックを取るような使い方ができる。

foo = ->(&bk){
  bk.call.upcase
}

puts foo.() { "nyao" }    #=>NYAO
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