对象的角过滤和合并数组[重复]

Question

我有：

arrayBefore = [{name:'n1', items: [i1]}, {name:'n2', items: [i2]}, {name:'n1', items: [i3]}]

myFunction(arrayBefore)

arrayAfter = [{name:'n1', items: [i1, i3]}, {name:'n2', items: [i2]}]

我尝试使用map（）和filter（）实现myFunction，但无法使其正常工作。如果我有接近的想法，我会展示一些我尝试过的代码，不幸的是，情况并非如此。任何帮助都将不胜感激！

Answer 1

reduce方法是您正在寻找的：

const result = arr.reduce((a, {name, items})=>{
     a[name] = a[name] || { name, items:[] };
     a[name].items.push(...items)
     return a;
 }, {});

一个例子：

let arr = [
    { name: 'n1', items: ['i1'] },
    { name: 'n2', items: ['i2'] },
    { name: 'n1', items: ['i3'] }
];

const result = arr.reduce((a, {name, items})=>{
     a[name] = a[name] || { name, items:[] };
     a[name].items.push(...items)
     return a;
 }, {});
 
 console.log(Object.values(result))