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return.rb #
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module Enumerable
  def return
    each do |i|
      value = yield(i)
      return value if value
    end
    nil
  end
end
 
h = {0 => 'a', 2 => 'b'}
[1,2,3].return {|x| h[x]} # => b
[4,5,6].return {|x| h[x]} # => nil