exercise24-retrieve-with-zip.js

// Exercise 24: Retrieve each video's id, title, middle interesting moment time, and smallest box art url.
// This is a variation of the problem we solved earlier. This time each video has an interesting moments collection,
// each representing a time during which a screenshot is interesting or representative of the title as a whole.
// Notice that both the boxarts and interestingMoments arrays are located at the same depth in the tree.
// Retrieve the time of the middle interesting moment and the smallest box art url simultaneously with zip().
// Return an {id, title, time, url} object for each video.

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(videos) {
            return Array.zip(
                videos.boxarts.reduce(function(first, next) {
                    return first.width * first.height < next.width * next.height ? first: next;
                }),
                    videos.interestingMoments.filter(function(moment) {
                        return moment.type === "Middle";
                }),
                    function(boxart, interestingMoment){
                        return {id: videos.id, title: videos.title, time: interestingMoment.time, url: boxart.url};
                }
            );
        });
    });
}