数组去重

使用set进行简单去重

let arr = [1, 1, 2, 3, 3, 5, 5, 3]
let set = new Set();
arr.forEach(val => {
    set.add(val)
})
console.log("arr: ", arr);  // 1, 1, 2, 3, 3, 5, 5, 3
console.log("set: ", set);  // 1, 2, 3, 5

使用reduce进行复杂数组去重

let person = [
    { id: 0, name: "小明" },
    { id: 1, name: "小张" },
    { id: 2, name: "小李" },
    { id: 3, name: "小孙" },
    { id: 1, name: "小周" },
    { id: 2, name: "小陈" },
];
console.log("过滤前：",person);
let obj = {};
person = person.reduce((cur, next) => {
    obj[next.id] ? "" : obj[next.id] = true && cur.push(next);
    return cur;
}, []) //设置cur默认类型为数组，并且初始值为空的数组

console.log("过滤后：",person);