Metaprogramming in Ruby

Exercise 5

Define the following class without class MaskedString, def tr_vowel and def self.tr_vowel

class MaskedString < String
  def tr_vowel
    tr 'aeiou', '*'
  end
  def self.tr_vowel str
    str.tr 'aeiou', '*'
  end
end

Hints:

• instance_eval, class_eval, define_method
• module, extend, extended
• module, include, included

This page was last updated on 20th Dec. 2009.