【js】数组对象去重

数组对象去重

let msgArr= [
     {msgID: 0, msg: "hello"},
     {msgID: 1, msg: "hi"},
     {msgID: 1, msg: "h"},
     {msgID: 2, msg: "hi"},
     {msgID:3, msg: "nihao"},
     {msgID: 3, msg: "what"},   
];
 let arr = msgArr;
              let obj = {};
                        let newArr = arr.reduce((cur, next) => {
                            obj[next.msgID] ? "" : obj[next.msgID] = true && cur.push(next);
                            return cur;
                        }, [])
                        console.log("----", newArr)

ES6 数组去重
1.new Set

const arr = [5,5,5,1,0]
console.log([...new Set(arr)]);// [5,1,0]

　2.Array.from（Set 结构转为数组）

function dedupe(arr) {
  return Array.from(new Set(arr));
}
dedupe([5, 5, 1, 0]) // [5, 1, 0]