两个数组对象取并集

两个数组对象去并集

arr1中的每一项都是对象,arr2中的每一项也都是对象

const a = [
    {_id: 1},
    {_id: 2},
    {_id: 3},
];
const b = [
    {_id: 2},
    {_id: 4},
]

解决方法一:

const c = a.filter(x => !b.find(y => y._id === x._id)); // [ { _id: 1 }, { _id: 3} ]

解决方法二:

const c = a.filter(x => b.every(y => y._id !== x._id));