nested.closures.js

var movieLists = [
  {
    name: "Instant Queue",
    videos: [
      {
        id: 70111470,
        title: "Die Hard",
        boxarts: [
          {
            width: 150,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/DieHard150.jpg"
          },
          {
            width: 200,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/DieHard200.jpg"
          }
        ],
        url: "http://api.netflix.com/catalog/titles/movies/70111470",
        rating: 4.0,
        bookmark: []
      },
      {
        id: 654356453,
        title: "Bad Boys",
        boxarts: [
          {
            width: 200,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/BadBoys200.jpg"
          },
          {
            width: 150,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/BadBoys150.jpg"
          }
        ],
        url: "http://api.netflix.com/catalog/titles/movies/70111470",
        rating: 5.0,
        bookmark: [
          {
            id: 432534,
            time: 65876586
          }
        ]
      }
    ]
  },
  {
    name: "New Releases",
    videos: [
      {
        id: 65432445,
        title: "The Chamber",
        boxarts: [
          {
            width: 150,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/TheChamber150.jpg"
          },
          {
            width: 200,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/TheChamber200.jpg"
          }
        ],
        url: "http://api.netflix.com/catalog/titles/movies/70111470",
        rating: 4.0,
        bookmark: []
      },
      {
        id: 675465,
        title: "Fracture",
        boxarts: [
          {
            width: 200,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/Fracture200.jpg"
          },
          {
            width: 150,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/Fracture150.jpg"
          },
          {
            width: 300,
            height: 200,
            url: "http://cdn-0.nflximg.com/images/2891/Fracture300.jpg"
          }
        ],
        url: "http://api.netflix.com/catalog/titles/movies/70111470",
        rating: 5.0,
        bookmark: [
          {
            id: 432534,
            time: 65876586
          }
        ]
      }
    ]
  }
];

var result = movieLists.flatMap(function(movieList) {
  return movieList.videos.flatMap(function(video) {
    return video.boxarts
      .filter(function(boxart) {
        return boxart.width === 150 && boxart.height === 200;
      })
      .map(function(boxart) {
        return {
          id: video.id,
          title: video.title,
          boxart: boxart.url
        };
      });
  });
});
console.log(result);