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seejohnrun/map_count.rb

Created November 7, 2014 18:38
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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}
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