Delegating Method Calls to Another Object : DelegateClass « Class « Ruby

1. Ruby
2. Class
3. DelegateClass

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

 

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