module Polyfill
  module V2_4
    module Hash
      module TransformValues
        module Method
          def transform_values
            unless block_given?
              return Enumerator.new(keys.size) do |yielder|
                each_with_object({}) do |(k, v), acc|
                  acc[k] = yielder.yield(v)
                end
              end
            end

            each_with_object({}) do |(k, v), acc|
              acc[k] = yield(v)
            end
          end if RUBY_VERSION < '2.4.0'
        end

        if RUBY_VERSION < '2.4.0'
          refine ::Hash do
            include Method
          end
        end
      end
    end
  end
end