Ruby Enumerator.new(size)

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Every ruby enumerator supports count . It’s a method that will iterate over every item and return their total count. irb> enum = Enumerator.new { |yielder| ( 1 .. 100 ).each do |i| puts "counting item: #{i} " yielder << i end } irb> enum.count counting item: 1 counting item: 2 … counting item: 100 => 100 However, Enumerable also has size . Except, by default it’s just nil . irb> enum.size => nil A…

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