array-numbers.rb

   1 # Some utility extensions for helping manipulate numbers
   2 # and lists of digits
   3
   4 class Array
   5   # Convert a list of digits into a number
   6   def to_i
   7     self.map {|d| d.to_s}.join.to_i
   8   end
   9
  10   # Convert a two-item list of nubmers into a rational
  11   def to_r
  12     Rational(self[0].to_i, self[1].to_i)
  13   end
  14 end
  15
  16 class Integer
  17   # Split a number into a list of digits
  18   def to_digits
  19     self.to_s.split('').map {|d| d.to_i}
  20   end
  21 end