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()