原生JS关于数组对象相同属性的相加与数组去重

数组对象相同属性的相加

let obj = {};
const arr = [
{ name: ‘A’, stock: 1 },
{ name: ‘B’, stock: 1 },
{ name: ‘A’, stock: 33 },
{ name: ‘B’, stock: 2 },
{ name: ‘C’, stock: 0 }
];
// 第一种方式
arr.forEach(v => obj[v.name] = obj[v.name] === undefined ? v.stock : obj[v.name] + v.stock)
console.log(obj)
// 第二种方法
arr.forEach(v=>{
if (obj.hasOwnProperty(v.name)) {
obj[v.name] += v.stock
} else{
obj [v.name] = v.stock
}
})
console.log(obj)

 

 

数组去重

//1 reduce去重，针对数组对象
let person = [
{id: 0, name: “A”},
{id: 1, name: “B”},
{id: 2, name: “C”},
{id: 3, name: “D”},
{id: 1, name: “E”},
{id: 2, name: “F”},

更多内容请见原文，原文转载自：https://blog.csdn.net/weixin_44519496/article/details/120055440