A study of promises

promise-study.coffee

{Deferred} = require 'promise.coffee'

# Declare .then((value)->)
log = (value) ->
	def = new Deferred
	def.resolve console.log value
  # return deferred
	def.promise

# Declare time to delay
delay = (time) ->
	# Return function ((value)->) to .then((value)->)
	(value) ->
		def = new Deferred
		console.log("prev value:", value)
		setTimeout (->
			def.resolve("Delayed " + time + "ms")
		), time
		# Return the promise to .then(->return promise)
		def.promise

res = delay(1000)(0)
	.then delay(2000)
	.then log