Processing an array when data comes from several asynchronous requests in angular.js

async.js

var url = "http://api.mysite.com/json"
// arr is an array containing values for a parameter
$q.all(arr.map(function(element) {
  // return promises
  return $http.get(url, {param: element});
})).then(function(data) {
  // do something with data
  // data is an array of responses
  console.log(data);
  var transformedData = data.map(function(item) {
    // optional transform
    var transform = someFunction();
    return transform;
  });
});