CODEWITHSUNDEEP
node.jsasynchronouscoffeescript
jcollum
jcollum

Reputation: 46613

how should I process a set of async commands driven by a loop?

Say I want to insert a group of Store records into the database and call a callback when they are all complete: 

insertStores = (db, stores, callback) ->
  sql = ""
  processed = 0
  for store in stores
    do (store) ->
      # build sql
      sql = "some built sql goes here" 

      processQuery(db, sql, ->
        ++processed
        if processed >= stores.length
          callback?()
      )

I'm wondering if there's a more readable way to do this that will get rid of the processed variable. It's important that all inserts get processed before the callback is fired. I don't want to bring in any async to sync libraries. This is for a script, not an application.

Is there a better way to do this in coffeescript? I'm wondering if there's an elegant coffee-ish solution that I'm not aware of.

Upvotes: 0

Views: 49

Answers (1)

Brian Ensink
Brian Ensink

Reputation: 11218

Do you specifically need a CoffeeScript way of doing this? I think the Async package would be a good thing to use. It has a number of functions to let you run asynchronous tasks in series or parallel and get a single callback when everything is finished.

Upvotes: 1

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