Async.coffee

A CoffeeScript DSL for Async.

npm install async.coffee

In Action

async.parallel ->
	@fn one: ->
		setTimeout =>
				@callback null, 1
			, 500

	@fn two: ->
		setTimeout =>
				@callback null, 2
			, 200

	@callback ->
		expect(@results.one).toBe 1
		expect(@results.two).toBe 2
		expect(@err).toBeUndefined()

Concepts

• async functions have @callback in their context, also aliased as @cb and @c. They also receive it as their first argument.

• The @callback function receives the results as @results, also aliased to @res and @response and the error as @err, @e or @error. It also receives them as arguments: (err, res) ->.

Supported Functions

• Parallel
• Map

Parallel

• @fn - receives an object of named functions.
• @callback - (optional) the callback function.

async.parallel ->
	@fn one: ->
		setTimeout =>
				@callback null, 1
			, 500

	@fn two: ->
		setTimeout =>
				@callback null, 2
			, 200

	@callback ->
		expect(@results.one).toBe 1
		expect(@results.two).toBe 2
		expect(@err).toBeUndefined()

Map (array, function)

• @iter - receives an object of named functions.
• @callback - (optional) the callback function.

async.map [1..100], ->
	@iter ->
		setTimeout =>
				@callback null, @item*2
			, 100
	@callback ->
		for i in [0...100]
			expect(@results[i]).toBe((i+1)*2)
		expect(@err).toBeUndefined()
		done()