timeit.coffee

timeIt = (f)->
  start = Date.now()
  f()
  console.log 'time: ', Date.now() - start, 'ms'

adder = ->
  total = 0
  ((n = 0)-> total += n)

timeIt ->
  add = adder()
  add n for n in [0..1e6]
  console.log 'adder result:', add()


# Output
#
#     adder result: 500000500000
#     time:  39 ms