Notes / Builder Pattern

Builder pattern allows the instantiation of a complex object in a step by step manner. For example, in Ruby, we could do this:

class Person
  attr_accessor :first_name, last_name, :age

  def initialize(&blk)
    instance_eval(&blk) if block_given?
  end
end

person = Person.new do
  self.first_name = 'Nithin'
  self.last_name = 'Bekal'
  self.age = 27
end

Real world use of builder pattern - Builder::XMLMarkup

Links

Builder Pattern in Ruby