如何按 id 合并和分组对​​象数组？

Question

我需要将两个数组与具有相同 id 的对象合并。

const arr1 = [{id: 1, name: 'John'}, {id: 10, name: 'Janny'}, {id: 22, name: 'Mark'}];
const arr2 = [{id: 1, name: 'John', phone: '111'}, {id: 15, name: 'Nick'}, {id: 22, name: 'Mark'}];

结果应该是

[
  {id: 1, name: 'John', phone: '111'}, 
  {id: 15, name: 'Nick'},
  {id: 22, name: 'Mark'},
  {id: 10, name: 'Janny'}
]

我尝试使用 lodash _.isEqual(arr1, arr2) 但它不起作用，因为 {id: 1, name: 'John', phone: '111'} 不等于{id: 1, name: 'John'}。

Answer 1

您可以组合数组中的元素，使用映射或对象按 id 对它们进行分组，并获取值：

const arr1 = [
  { id: 1, name: 'John' },
  { id: 10, name: 'Janny' },
  { id: 22, name: 'Mark' },
];
const arr2 = [
  { id: 1, name: 'John', phone: '111' },
  { id: 15, name: 'Nick' },
  { id: 22, name: 'Mark' },
];

const result = [
  ...[...arr1, ...arr2]
    .reduce(
      (acc, curr) => acc.set(curr.id, { ...acc.get(curr.id), ...curr }),
      new Map()
    )
    .values(),
];
console.log(result)

Answer 2

这是一个非常愚蠢且漫长的方法：

const arr1 = [{id: 1, name: 'John'}, {id: 10, name: 'Janny'}, {id: 22, name: 'Mark'}];
const arr2 = [{id: 1, name: 'John', phone: '111'}, {id: 15, name: 'Nick'}, {id: 22, name: 'Mark'}];
let newArr = [];
firstLoop: for(let i=0; i < arr1.length; i++){
    for(let j =0; j < arr2.length; j++){
        if(arr1[i].id == arr2[j].id){
            newArr.push({...arr1[i], ...arr2[j]})
            continue firstLoop;
        }
    }
    newArr.push(arr1[i])
}
firstLoop: for(let i=0; i < arr1.length; i++){
    for(let j =0; j < arr2.length; j++){
        if(arr2[i].id == arr1[j].id){
            // newArr.push({...arr1[i], ...arr2[j]})
            continue firstLoop;
        }
    }
    newArr.push(arr2[i])
}
console.log(newArr);