Fluent interfaces + blocks example

message.rb

class Message
  def initialize(&block)
    instance_eval(&block) if block_given?
  end

  def to(name)
    @to = name
    self
  end

  def from(name)
    @from = name
    self
  end

  def text(message)
    @text = message
    self
  end

  def deliver
    puts "#{@from} said: #{@to}, #{@text}"
  end
end

message = Message.new do
  to "John"
  from "Mary"
  text "Awesome!"
  deliver
end