javascript - 根据年龄值将对象数组拆分为新数组或对象

Question

根据JavaScript中的年龄值将对象数组拆分为新数组或对象

var items = [
    {name:"Foo", age:16, color:"w"},
    {name:"Bar", age:18, color:"b"},
    {name:"foo", age:16, color:"w"},
    {name:"bar", age:18, color:"w"},
    {name:"foobar", age:18, color:"b"},
    {name:"barfoo", age:20, color:"w"}
];

如何返回类似以下的列表:

var items = [
    {age:16,name:"Foo"|"foo",gender:"w"|"w"},
    {age:18,name:"Bar"|"bar"|"foobar",gender:"b"|"w"|"b"},
    {age:20,name:"barfoo",gender:"w"}
];

我已经工作了，但输出的名称中带有“undefined”。下面是我的代码。

var data = [{age: 21,name: "Walter",color: "black"},{age: 25,name: "sentinel",color: "black"
},{age: 21,name: "Micah",color: "purple"},{age: 25,name: "mike",color: "black"},{age: 21,name: "Danny",color: "white"},{age: 25,name: "mike",color: "black"}];
var obj=data;
var arrayobj = obj.length;
var i, row, arr = obj, ss = {};
for (i = 0; i < arr.length; i++) {
    row = arr[i];   
    ss[row.age] = ss[row.age] || {count: 0};
    if (ss[row.age][row.age] === undefined) {                          
        ss[row.age][row.name] = row.name;
        ss[row.age]['name']+=row.name+'|';
        ss[row.age]['color']+=row.color+'|';
        ss[row.age]['count'] += 1;
    }
}
console.table(ss);

Answer 1

我假设您想按项目的年龄对其进行分组。这是一种方法:

(fiddle)

items.reduce(function(buckets,item){
    if(!buckets[item.age]) buckets[item.age] = [];
    buckets[item.age].push(item);
    return buckets;
},{});

让我们解释一下:

对于每个项目，如果我们还没有一个“bucket”，请创建一个新的空

将其添加到存储桶中

返回新的更新的存储桶列表。

该方法返回一个具有3个属性的对象:16,18和20，每个属性都包含具有该年龄的对象。