index.js

const movies = [
                 {  
                   "Title": "Inception",
                   "Year": "2010",
                   "Director": "Christopher Nolan"
                },
                {  
                   "Title": "Interstellar",
                   "Year": "2014",
                   "Director": "Christopher Nolan"
                },
                {
                   "Title": "Avatar",
                   "Year": "2009",
                   "Director": "James Cameron"
                },
                {
                   "Title": "The Dark Knight",
                   "Year": "2008",
                   "Director": "Christopher Nolan"
                },
                {  
                   "Title": "Batman Begins",
                   "Year": "2005",
                   "Director": "Christopher Nolan"
                }
];
console.table(movies.groupBy('Director'));