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if ([1].product([2]){break false} rescue true)
require 'backports/tools/arguments'
require 'backports/tools/alias_method_chain'
require 'backports/1.8.7/array/product'
class Array
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
Backports.alias_method_chain self, :product, :block
end
end
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