nested promises

gistfile1.txt

function allMovies() {
    return client.smembersAsync('movies.ids').then(function(ids) {
      var movies = _.map(ids, function(id) {
         return client.hmgetAsync("movies:" + id, 'title', 'description', 'director', 'year').then(function(data) {
           return {
                 title: data[0], 
                 description: data[1], 
                 director: data[2],
                 year: data[3]
               };
          });
        });
        return Promise.all(movies);
      });

Hi mulderp I am new to writing Promises and hence came across your question. I want to ask you does
client.smembersAsync('movies.ids') this function return a Promise Object or is it just a normal function. Can you call .then() on normal functions