Function for executing things in parallel, because I couldn't find any I liked =)

gistfile1.coffee

parallel = (ops) ->
	results = []
	numOps = ops.length

	errHandler = null
	hadError = false
	okHandler = null

	for op, num in ops
		do (num) ->
			op (err, result) ->
				# ignore if had an error earlier
				if hadError
					return

				if err? and errHandler
					hadError = true
					return errHandler err

				numOps--
				results[num] = result

				if numOps == 0 and not hadError
					okHandler.apply {}, results

	handlers = {
		err: (errFn) ->
			errHandler = errFn
			return handlers

		ok: (okFn) ->
			okHandler = okFn
			return handlers
	}

	return handlers


# Usage:

parallel([
    (n) -> getFoos (err, foos) -> n(err, foos)
    (n) -> getBars (err, bars) ->  n(err, bars)
]).err((err) ->
    # Execution goes here if any of the above functions produce an error
).ok((foos, bars) ->
    # foos is now result of getFoos
    # bars is now result of getBars
)