Functional programming: Combine map with zip

combine-map-with-zip.js

function() {
	var movieLists = [
			{
				name: "New Releases",
				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,
						"interestingMoments": [
							{ type: "End", time:213432 },
							{ type: "Start", time: 64534 },
							{ type: "Middle", time: 323133}
						]
					},
					{
						"id": 654356453,
						"title": "Bad Boys",
						"boxarts": [
							{ width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/BadBoys200.jpg" },
							{ width: 140, height:200, url:"http://cdn-0.nflximg.com/images/2891/BadBoys140.jpg" }

						],
						"url": "http://api.netflix.com/catalog/titles/movies/70111470",
						"rating": 5.0,
						"interestingMoments": [
							{ type: "End", time:54654754 },
							{ type: "Start", time: 43524243 },
							{ type: "Middle", time: 6575665}
						]
					}
				]
			},
			{
				name: "Instant Queue",
				videos: [
					{
						"id": 65432445,
						"title": "The Chamber",
						"boxarts": [
							{ width: 130, height:200, url:"http://cdn-0.nflximg.com/images/2891/TheChamber130.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,
						"interestingMoments": [
							{ type: "End", time:132423 },
							{ type: "Start", time: 54637425 },
							{ type: "Middle", time: 3452343}
						]
					},
					{
						"id": 675465,
						"title": "Fracture",
						"boxarts": [
							{ width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture200.jpg" },
							{ width: 120, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture120.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,
						"interestingMoments": [
							{ type: "End", time:45632456 },
							{ type: "Start", time: 234534 },
							{ type: "Middle", time: 3453434}
						]
					}
				]
			}
		];

	//------------ COMPLETE THIS EXPRESSION --------------
	return movieLists.
		concatMap(function(movieList) {
      
      return movieList.videos.concatMap(function(video) {
        
        return Array.zip(
          video.boxarts.reduce(function(acc, curr) {
            if (curr.width * curr.height < acc.width * acc.height) {
             return curr; 
            } else {
             return acc; 
            }
          }), // [{smallestBoxart}] 
          video.interestingMoments.filter(function(moment) {
           return moment.type === "Middle"; 
          }), // [{middleMoment}]
          function(boxart, moment) {
            return {
              id: video.id,
              title: video.title,
              time: moment.time,
              url: boxart.url
            }
          }
        ); // [{id, title, time, url}]
        
      }); // [{id, title, time, url} * video.length]
      
		}); // [{id, title, time, url} * video.length * movieList.length]

}