如何在javascript中动态按数组值分组

Question

嗨，我正在使用JavaScript，我有一组数组，我需要按对象分组

码

 var data = [{BuildingID: "5", FloorId: "65", one: 12, two: 15,three: 12},
            {BuildingID: "5", FloorId: "65", one: 12, two: 15,three: 12},
            {BuildingID: "6", FloorId: "65", one: 12, two: 15,three: 12},
            {BuildingID: "6", FloorId: "65", one: 12, two: 15,three: 12}]

我正在尝试按BuildingID进行分组，添加一，二，三注意：一二三不是静态的

预期输出

  var data = [{BuildingID: "5", FloorId: "65", one: 24, two: 30,three: 24},
              {BuildingID: "6", FloorId: "65", one: 24, two: 30,three: 24} ]

Answer 1

您可以通过使用哈希表和对象的静态键数组来使用动态方法。

 var data = [{ BuildingID: "5", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "5", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "6", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "6", FloorId: "65", one: 12, two: 15, three: 12 }], staticKeys = ['BuildingID', 'FloorId'] , grouped = data.reduce(function (hash) { return function (r, a) { var key = a[staticKeys[0]]; if (!hash[key]) { hash[key] = {}; staticKeys.forEach(function (k) { hash[key][k] = a[k]; }); r.push(hash[key]); } Object.keys(a).forEach(function (k) { if (staticKeys.indexOf(k) === -1) { hash[key][k] = (hash[key][k] || 0) + a[k]; } }); return r; }; }(Object.create(null)), []); console.log(grouped); 

 .as-console-wrapper { max-height: 100% !important; top: 0; } 

Answer 2

这是一个对我有用的代码片段，

假设您知道对象的关键属性

var arr = [ { id: 1, name: 'bob' }, { id: 1, name: 'bill' }, { id: 1, name: 'bill' } ]

var noDuplicate = [];
var unique = {};

$.each(arr, function(key, item) {

    if (! unique[item.id + "-" + item.name]) {
        noDuplicate.push(item);
        unique[item.id + "-" + item.name] = true;
    }
});

console.log(noDuplicate);

希望能帮助到你 ;）

问候。

Answer 3

您可以尝试使用此代码段，“输出”变量包含结果；

var data = [{ BuildingID: "5", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "5", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "6", FloorId: "65", one: 12, two: 15, three: 12 }, { BuildingID: "6", FloorId: "65", one: 12, two: 15, three: 12 }]
var groupBy = function(input, key) {
   return input.reduce(function(list, x) {
     list[x[key]] = x;
     return list;
   }, {});
};
var grouped = groupBy(data, 'BuildingID'), output=[];
for ( var key in grouped ) { output[output.length] = grouped[key]; }
console.log(output);