Dimensional repeat executor.

array_ext.rb

#
# usage: [2,2,2].times { |i,j,k| do something... }
#
class Array
  def times(&block)
    raise unless block_given?
    return nil if empty?
    dim_call__(nil, self, &block)
  end

  private
  def dim_call__(stack, dims, &block)
    stack ||= []
    if dims.size == 0
      block.call(*stack)
    else
      t = dims[0]
      l = dims[1..-1]
      t.times do |i|
        stack.push(i)
        dim_call__(stack, l, &block)
        stack.pop
      end
    end
  end
end