It seems impossible to get a good syntax in CoffeeScript for the CallStream pattern: * http://dbj.org/dbj/?p=514 * http://weblogs.asp.net/bleroy/archive/2010/07/01/oh-yeah-callstream-is-great-to-express-monads.aspx

state_monad.coffee

stateful = (value, state) ->
    bind = (operation) -> 
      stateful(operation.call(bind, value), bind.state)    
    bind.value = value
    bind.state = state
    bind

p = stateful(3, "This is the state")((i) -> ++i)((i) -> this.state += "altered"; i * 10)((i) -> i + 2)

console.log("Value: " + p.value + "; state: " + p.state);