wait for multiple ajax requests to finish

wait.coffee

waitForAjaxRequestsToComplete = (callback, functions) ->
  successes = 0
  failures = 0
  failedCalls = []
  $(functions).each (index, item) ->
    item.done ->
      successes += 1
    item.fail ->
      failures += 1
      failedCalls.push item
    item.always ->
      functions.pop item
      if functions.length == 0
        callback { 
            successes: successes,
            failures: failures,
            failed: failedCalls
          }

wait.js

var waitForAjaxRequestsToComplete = function(callback, functions) {
    var failedCalls, failures, successes;
    successes = 0;
    failures = 0;
    failedCalls = [];
    return $(functions).each(function(index, item) {
      item.done(function() {
        return successes += 1;
      });
      item.fail(function() {
        failures += 1;
        return failedCalls.push(item);
      });
      return item.always(function() {
        functions.pop(item);
        if (functions.length === 0) {
          return callback({
            successes: successes,
            failures: failures,
            failed: failedCalls
          });
        }
      });
    });
  };