async.coffee

Coffee DSL for Async

npm install async.coffee
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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()
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