# File lib/backports/1.8.7/enumerable.rb, line 165 def minmax_by return to_enum(:minmax_by) unless block_given? min_object, min_result = nil, MOST_EXTREME_OBJECT_EVER max_object, max_result = nil, MOST_EXTREME_OBJECT_EVER each do |object| result = yield object min_object, min_result = object, result if min_result > result max_object, max_result = object, result if max_result < result end [min_object, max_object] end