seejohnrun · November 7, 2014 18:38
diff --git a/map_count.rb b/map_count.rb
 module Enumerable
  def map_count
    Hash.new(0).tap { |h| each { |e| h[yield e] += 1 } }
  end
 end

 puts [1, 2, 3, 4, 5].map_count(&:odd?) # {true=>3, false=>2}
	module Enumerable
	def map_count
	Hash.new(0).tap { \|h\| each { \|e\| h[yield e] += 1 } }
	end
	end

	puts [1, 2, 3, 4, 5].map_count(&:odd?) # {true=>3, false=>2}