# File lib/backports/1.9.2/array/product.rb, line 7 def product_with_block(*arg, &block) return product_without_block(*arg) unless block_given? # Same implementation as 1.8.7, but yielding arg.map!{|ary| Backports.coerce_to_ary(ary)} arg.reverse! # to get the results in the same order as in MRI, vary the last argument first arg.push self outer_lambda = arg.inject(block) do |proc, values| lambda do |partial| values.each do |val| proc.call(partial.dup << val) end end end outer_lambda.call([]) self end