play.coffee

render = (lines) ->
  @button ->
    @text "Say hello!"
    @onclick (e) ->
      lines.add "Hello simulated universe"
  for x in lines
    @div ->
      @text x
 
# impl
p = console.log.bind console
builder =
  button: (fn) ->
    p '<button>'
    fn.call builder
    p '</button>'
  
  div: (fn) ->
    p '<div>'
    fn.call builder
    p '</div>'
   
  text: (text) ->
    p text
    
  onclick: (fn) ->
    p 'onclick=fn'

render.call builder, ['line1']