Command pattern ruby

class Command
  attr_reader :name
  def initialize(name)
    @name = name
  end
  def run
    raise "Implement me"
  end
end

class MakeBold < Command
  def initialize(text)
    super("Make bold text: #{text}")
    @text = text
  end
  
  def run; puts "<b>#{@text}</b>"; end
end

class MakeItalic < Command
  def initialize(text)
    super("Make italic text: #{text}")
    @text = text
  end
  
  def run; puts "<i>#{@text}</i>"; end
end

class MakeSized < Command
  def initialize(text, size=14)
    super("Make text: #{text} to be size: #{size}")
    @text = text
    @size = size
  end
  
  def run; puts "<span style='font-size:#{@size}px;'>#{@text}</span>"; end
end

commands = []
commands << MakeBold.new("to be bold")
commands << MakeItalic.new("to be italic")
commands << MakeSized.new("to be sized", 20)
commands << MakeBold.new("other to be bold")

# show description for each command prior to execution
commands.each {|command| command.name }
# execute commands
commands.each {|command| command.run }

Output:

$ ruby command.rb 
<b>to be bold</b>
<i>to be italic</i>
<span style='font-size:20px;'>to be sized</span>
<b>other to be bold</b>