Question

I am having an issue figuring out how to make an array of functions with different parameters. I am using coffeescript and async but I think it is a problem with my understanding of javascript.

I want to create an array of functions with different tasks.

names = ['Jeff', 'Maria', 'Steve']
tasks = []

for name in names
  tasks.push (callback)=>
      @controller.get_person name, (person) =>
        callback(null, person)

async.parallel(tasks, cb)

The problem is that the task is getting called with Steve (always the one that is last in the array) three times. How do I make it so that there is one task per each name?

Answer 1

Actually, in this particular case, you should probably make use of async’s map:

getPerson = (name, callback) =>
  @controller.get_person name, (person) ->
    callback(null, person)

async.map names, getPerson, (err, persons) ->
  // Do stuff with persons

Note that if your @controller.get_person method followed the node practice of passing any errors as the first parameter to the callback, this would suffice:

async.map names, @controller.get_person, (err, persons) ->
  // Do stuff with persons

Something to keep in mind, perhaps.