zoukankan      html  css  js  c++  java
  • [Javascript] bukld 'SQL' like object tree

    Let's try creating a deeper tree structure. This time we have 4 separate arrays each containing lists, videos, boxarts, and bookmarks respectively. Each object has a parent id, indicating its parent. We want to build an array of list objects, each with a name and a videos array. The videos array will contain the video's id, title, bookmark time, and smallest boxart url. In other words we want to build the following structure:

    [
        {
            "name": "New Releases",
            "videos": [
                {
                    "id": 65432445,
                    "title": "The Chamber",
                    "time": 32432,
                    "boxart": "http://cdn-0.nflximg.com/images/2891/TheChamber130.jpg"
                },
                {
                    "id": 675465,
                    "title": "Fracture",
                    "time": 3534543,
                    "boxart": "http://cdn-0.nflximg.com/images/2891/Fracture120.jpg"
                }
            ]
        },
        {
            "name": "Thrillers",
            "videos": [
                {
                    "id": 70111470,
                    "title": "Die Hard",
                    "time": 645243,
                    "boxart": "http://cdn-0.nflximg.com/images/2891/DieHard150.jpg"
                },
                {
                    "id": 654356453,
                    "title": "Bad Boys",
                    "time": 984934,
                    "boxart": "http://cdn-0.nflximg.com/images/2891/BadBoys140.jpg"
                }
            ]
        }
    ]
      

    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,  130, height:200, url:"http://cdn-0.nflximg.com/images/2891/TheChamber130.jpg" },
                { videoId: 65432445,  200, height:200, url:"http://cdn-0.nflximg.com/images/2891/TheChamber200.jpg" },
                { videoId: 675465,  200, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture200.jpg" },
                { videoId: 675465,  120, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture120.jpg" },
                { videoId: 675465,  300, height:200, url:"http://cdn-0.nflximg.com/images/2891/Fracture300.jpg" },
                { videoId: 70111470,  150, height:200, url:"http://cdn-0.nflximg.com/images/2891/DieHard150.jpg" },
                { videoId: 70111470,  200, height:200, url:"http://cdn-0.nflximg.com/images/2891/DieHard200.jpg" },
                { videoId: 654356453,  200, height:200, url:"http://cdn-0.nflximg.com/images/2891/BadBoys200.jpg" },
                { videoId: 654356453,  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 };
                                });
                    })
            };
        });
    
    }
  • 相关阅读:
    第5次系统综合实践
    第4次系统综合实践
    第3次系统综合实践
    第2次实践作业
    第1次实践作业
    第03组 Beta版本演示
    第03组 Beta冲刺(4/4)
    OO第四单元总结
    OO第三单元总结
    OO第二单元总结
  • 原文地址:https://www.cnblogs.com/Answer1215/p/5621702.html
Copyright © 2011-2022 走看看