Wait for N or Multiple or Unknown number (Depends on some logic) of ajax request using JQuery

wait_for_n_call.coffee

# Makes ajax req to fetch data
class Model
  initialize(id)
    @id = id
  
  load: (token) ->
    $.ajax({
      url: "foo/bar/#{@id}",
      ....
      success: (response) =>
        token.resolve
    })

class Test
  waitForNCalls: (ids) ->
    tokens = []
    for id in ids
      token = $.Deferred
      loader = new Model(id)
      loader.load(token)
      tokens.push(token)
    return tokens
  
  # Here is where the magic happens, it waits for all the tokens to get resolved
  $.when.apply(this, @waitForNCalls([1,2,3....N])).done( =>
    # Show RED BLINK
  )