javascript - 对对象数组中的项目进行分组和排序

Question

这是我的对象数组:

var array = [
 {season:  1, episode:  2, notes: "..."},
 {season:  1, episode:  2, notes: "..."},
 {season:  1, episode:  1, notes: "..."},
 {season: -1, episode: -1, notes: "..."},
 {season: -1, episode: -1, notes: "..."},
 {season: -1, episode: -1, notes: "..."},
 {season:  3, episode:  1, notes: "..."},
 {season:  13, episode:  12, notes: "..."},
 {season:  2, episode:  1, notes: "..."},
];

我想按季节对这个数组进行排序，因此结果必须是:

var sorted_array = [
 {season: -1, episode: -1, notes: "..."},
 {season: -1, episode: -1, notes: "..."},
 {season: -1, episode: -1, notes: "..."},
 {season:  1, episode:  1, notes: "..."},
 {season:  1, episode:  2, notes: "..."},
 {season:  1, episode:  2, notes: "..."},
 {season:  2, episode:  1, notes: "..."},
 {season:  3, episode:  1, notes: "..."},
 {season:  13, episode:  12, notes: "..."},
];

并按季节和剧集对数组进行分组，因此必须使用另一个键，结果必须如下所示:

var final_array = [

 { "S-1 E-1": [
   {season: -1, episode: -1, notes: "..."},
   {season: -1, episode: -1, notes: "..."},
   {season: -1, episode: -1, notes: "..."},
 ] },
 { "S01 E01": [
   {season:  1, episode:  1, notes: "..."}
 ] },
 { "S01 E02": [
   {season:  1, episode:  2, notes: "..."},
   {season:  1, episode:  2, notes: "..."}
 ] },
 { "S02 E01": [
   {season:  2, episode:  1, notes: "..."}
 ] },
 { "S03 E01": [
   {season:  3, episode:  1, notes: "..."}
 ] },
 { "S13 E12": [
   {season:  13, episode:  12, notes: "..."}
 ] }

];

关于如何从 array 生成像 final_array 这样的数组有什么想法吗？

谢谢

Answer 1

您可以使用_.groupBy立即进行分组:

var grouped = _.groupBy(array, function (el) { 
    var s = el.season,
        e = el.episode;
    return "S" + (s > 0 && s < 10 ? "0" : "") + s +
           " E" + (e > 0 && e < 10 ? "0" : "") + e;
});

这将生成一个以分组值作为键的单个对象:

{ 
    "S-1 E-1": [
        {season: -1, episode: -1, notes: "..."},
        {season: -1, episode: -1, notes: "..."},
        {season: -1, episode: -1, notes: "..."},
    ],
    "S01 E01": [
        {season:  1, episode:  1, notes: "..."}
    ],
    "S01 E02": [
        {season:  1, episode:  2, notes: "..."},
        {season:  1, episode:  2, notes: "..."}
    ],
    "S02 E01": [
        {season:  2, episode:  1, notes: "..."}
    ],
    "S03 E01": [
        {season:  3, episode:  1, notes: "..."}
    ],
    "S13 E12": [
        {season:  13, episode:  12, notes: "..."}
    ]
}

如果您想按季节/剧集排序顺序对其进行迭代，您可以对其键进行排序并迭代这些键:

_.sortBy(Object.keys(grouped), function (el) { return el; }).forEach(function (key) {
    console.log(key + ":");
    console.log(grouped[key]);
});

http://jsfiddle.net/g370ycmn/