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Categories / Ruby / Class

 

Delegating Method Calls to Another Object

require 'delegate' class OrdinalNumber < DelegateClass(Fixnum)   def to_s     delegate_s = __getobj__.to_s     check = abs     if check == 11 or check == 12       suffix = "th"     else       case check % 10       when 1 then suffix = "st"       when 2 then suffix = "nd"       else suffix = "th"       end     end     delegate_s + suffix   end end 4.to_s                                         # => "4" OrdinalNumber.new(4).to_s                      # => "4th" OrdinalNumber.new(102).to_s                    # => "102nd" OrdinalNumber.new(11).to_s                     # => "11th" OrdinalNumber.new(-21).to_s                    # => "-21st" OrdinalNumber.new(5).succ                      # => 6 OrdinalNumber.new(5) + 6                       # => 11 OrdinalNumber.new(5) + OrdinalNumber.new(6)     # => 11