Create an HTML table in Ruby

gistfile1.rb

html = "".tap do |str|
  str << '<table>'
    str << '<tr>'
      str << '<td>'
       str << 'a'
      str << '</td>'
      str << '<td>'
       str << 'b'
      str << '</td>'
    str << '</tr>'
  str << '</table>'
end

puts html

module HTMLMethods
  def wrap(tag)
    concat "<#{tag}>"
    yield
    concat "</#{tag}>"
  end
end

html = "".tap do |s|
  s.extend HTMLMethods

  s.wrap :table do
    s.wrap :tr do
      s.wrap(:td) { s << 'a' }
      s.wrap(:td) { s << 'b' }
    end
  end
end

puts html

class HTMLFactory
  def self.make(&block)
    new.instance_eval(&block)
  end

  attr_reader :str

  def initialize
    @str = ""
  end

  def wrap(tag)
    str.concat "<#{tag}>"
    yield
    str.concat "</#{tag}>"
  end
end

html = HTMLFactory.make do
  wrap :table do
    wrap :tr do
      wrap(:td) { str << 'a' }
      wrap(:td) { str << 'b' }
    end
  end
end

puts html