[Javascript] bukld 'SQL' like object tree

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Note: please make sure when creating objects (both lists and videos) that you add properties in the same order as above. This doesn‘t impact the correctness of your code, but the verifier expects properties to be created in this order.

function() {
    var lists = [
            {
                "id": 5434364,
                "name": "New Releases"
            },
            {
                "id": 65456475,
                name: "Thrillers"
            }
        ],
        videos = [
            {
                "listId": 5434364,
                "id": 65432445,
                "title": "The Chamber"
            },
            {
                "listId": 5434364,
                "id": 675465,
                "title": "Fracture"
            },
            {
                "listId": 65456475,
                "id": 70111470,
                "title": "Die Hard"
            },
            {
                "listId": 65456475,
                "id": 654356453,
                "title": "Bad Boys"
            }
        ],
        boxarts = [
            { videoId: 65432445, width: 130, height:200, url:"http://cdn-0.nflximg.com/images/2891/TheChamber130.jpg" },
            { videoId: 65432445, width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/TheChamber200.jpg" },
            { videoId: 675465, width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture200.jpg" },
            { videoId: 675465, width: 120, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture120.jpg" },
            { videoId: 675465, width: 300, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture300.jpg" },
            { videoId: 70111470, width: 150, height:200, url:"http://cdn-0.nflximg.com/images/2891/DieHard150.jpg" },
            { videoId: 70111470, width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/DieHard200.jpg" },
            { videoId: 654356453, width: 200, height:200, url:"http://cdn-0.nflximg.com/images/2891/BadBoys200.jpg" },
            { videoId: 654356453, width: 140, height:200, url:"http://cdn-0.nflximg.com/images/2891/BadBoys140.jpg" }
        ],
        bookmarks = [
            { videoId: 65432445, time: 32432 },
            { videoId: 675465, time: 3534543 },
            { videoId: 70111470, time: 645243 },
            { videoId: 654356453, time: 984934 }
        ];

    return lists.map(function(list) {
        return {
            name: list.name,
            videos:
                videos.
                    filter(function(video) {
                        return video.listId === list.id;
                    }).
                    concatMap(function(video) {
                        return Array.zip(
                            bookmarks.filter(function(bookmark) {
                                return bookmark.videoId === video.id;
                            }),
                            boxarts.filter(function(boxart) {
                                return boxart.videoId === video.id;
                            }).
                            reduce(function(acc,curr) {
                                return acc.width * acc.height < curr.width * curr.height ? acc : curr;
                            }),
                            function(bookmark, boxart) {
                                return { id: video.id, title: video.title, time: bookmark.time, boxart: boxart.url };
                            });
                })
        };
    });

}

[Javascript] bukld 'SQL' like object tree

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本文系统来源：http://www.cnblogs.com/Answer1215/p/5621702.html

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