3. Return the average rating of movies

average.js

let ratingsAverage = movies.map((movie) => {
  return movie.rating;
});

ratingsAverage = ratingsAverage.reduce((total, rating) => {
  return (total + rating);
});

console.log(ratingsAverage / movies.length);
// 8.357142857142858

// equivalent to lines 1-7
const ratingsAverage = movies
  .map(movie => movie.rating)
  .reduce((total, rating) => total + rating);