third-party/mruby/mrbgems/mruby-numeric-ext/mrblib/numeric_ext.rb

   1 class Numeric
   2   def zero?
   3     self == 0
   4   end
   5
   6   def nonzero?
   7     if self == 0
   8       nil
   9     else
  10       self
  11     end
  12   end
  13
  14   def positive?
  15     self > 0
  16   end
  17
  18   def negative?
  19     self < 0
  20   end
  21 end