A promise-returning function called with parameters using Q.then(), chained sequentially

gistfile1.js

var ani = function(d) {
  var deferred = Q.defer();
  setTimeout(function() {
    console.log('this delayed by ' + d);
    deferred.resolve();
  }, d);
  return deferred.promise;
}

ani(1000).then(
  function() {
    return ani(1001);
  })
  .then(
    function() {
      return ani(1002);
    });