A small collection of generic CoffeeScript helper functions.

common.coffee

# shorthand wrapper for `console.log`
put = (args...) -> console.log args...

# initialise undefined vars: `[a, b, c] = init 3`
init = (amount) -> undefined for n in [1..amount]

# decorator for defining constructors (see example.coffee)
factory = (mutator) -> (args...) ->
    mutator (self = Object.create null), args...
    return self
  
# decorator for defining blessings (see example.coffee)
bless = (mutator) -> (self, args...) ->
    mutator self, args...
    return self

example.coffee

Employee = factory (self, name, salary) ->
  self.name = name
  self.salary = salary
  self.raise = (amount) -> self.salary += amount

addVoice = bless (self) ->
  self.greet = ->
    put "Hi, my name is #{self.name}."
    put "I currently earn $#{self.salary}."

alice = Employee "Alice", 50000
addVoice alice
alice.raise 10000
alice.greet()