Array#to_i - turn a comma-delimited number into an integer

Array#to_i.rb

class Array
  def to_i
    i = 0
    numeral = 0
    self.reverse.inject(0) do |int, section|
      i += 1
      int += section * (10 ** numeral)
      numeral += section.to_i.to_s.size
      int
    end
  end
end

[11,694,331.42].to_i #=> 11694331.42
[999,999,999,999,999].to_i #=> 999999999999999