Metaprogramming 002

class_new_002.rb

attributes = %w[name species]
MyReadOnlyClass = Class.new do
  attr_reader *attributes
  define_method :initialize do |data|
    attributes.each_with_index do |attribute, idx|
      self.instance_variable_set "@#{attribute}", data[idx]
    end
  end
end
 
v = MyReadOnlyClass.new(["Fred", "Wombat"])
puts v.methods(false)
puts v.inspect
puts v.name = "Fared"