如果一个键相同，则创建新的对象数组，然后添加这些对象的其他键值 [英] Create new array of objects if one key is same then add other key's value of those object

问题描述

我想根据一个键过滤掉我的对象数组。如果该键在其他对象中相同，则将添加对象的第二个值。我有一个如下所示的对象数组：

I want to filter down my array of object based upon the one key. If that key is same in other object then second value of object will be added. I have an array of object like below:

输入：

var myArray = [
{
_name : "Mike",
_amount : "7"
},
{
_name : "Julius",
_amount : "10"
},
{
_name : "Edison",
_amount : "2"
},
{
_name : "Mike",
_amount : "10"
},
{
_name : "Kate",
_amount : "0"
},{
_name : "Edison",
_amount : "10"
}
]

输出：

var myNewArray = [
{
_name : "Mike",
_amount : "17"
},
{
_name : "Julius",
_amount : "10"
},
{
_name : "Edison",
_amount : "12"
},
{
_name : "Kate",
_amount : "0"
},
]

迈克和爱迪生重复两次，以便为这些对象添加_amount键的值。它对我来说有点困惑。请帮帮我。谢谢！

Mike and Edison is repeated twice so _amount key's value added for those objects. Its little confusing for me. Please help me out. Thank you!

推荐答案

您可以使用 Array＃forEach 和一个对象作为插入对象的参考。

You could use Array#forEach and an object as reference for the inserted objects.

var myArray = [{ _name: "Mike", _amount: "7" }, { _name: "Julius", _amount: "10" }, { _name: "Edison", _amount: "2" }, { _name: "Mike", _amount: "10" }, { _name: "Kate", _amount: "0" }, { _name: "Edison", _amount: "10" }],
    newArray = [];

myArray.forEach(function (a) {
    if (!this[a._name]) {
        this[a._name] = { _name: a._name, _amount: 0 };
        newArray.push(this[a._name]);
    }
    this[a._name]._amount = (+this[a._name]._amount + +a._amount).toString(); // if you really
}, Object.create(null));                                                      // need strings

console.log(newArray);

按要求排序按 _amount 降序

var myArray = [{ _name: "Mike", _amount: "7" }, { _name: "Julius", _amount: "10" }, { _name: "Edison", _amount: "2" }, { _name: "Mike", _amount: "10" }, { _name: "Kate", _amount: "0" }, { _name: "Edison", _amount: "10" }],
    newArray = [];

myArray.forEach(function (a) {
    if (!this[a._name]) {
        this[a._name] = { _name: a._name, _amount: 0 };
        newArray.push(this[a._name]);
    }
    this[a._name]._amount += +a._amount
}, Object.create(null));

newArray.sort(function (a, b) {
    return b._amount - a._amount;
});

console.log(newArray);

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