Deduplicate the array according to the properties of an object in the array

During the project process, sometimes it is necessary to deduplicate the received data:

1. If it is pure data with only one layer of data structure, I usually use ES6's new Set method to remove duplicates:

let arr = [1,4,5,7,3,6,1,4];

let newArr = Array.from(new Set(arr));

console.log(newArr);

//[1,4,5,7,3,6]

2. But in real projects, we rarely encounter the above arrays, so when encountering objects in the array, I generally use the following method to deduplicate:

methods:{
handleDuplicateRemoval(list){
          let userList = [];
          let hash = {};
          userList = list.reduce((preVal, curVal) => {
            hash[curVal.name] ? '' : hash[curVal.name] = true && preVal.push(curVal);
            return preVal
          }, []);
          return userList;
        },

getListData(){
    let list = [
            {
             id:1,
             name:'张三',
             companyId:666
             },
            {
             id:2,
             name:'李四',
             companyId:222
             },
            {
             id:3,
             name:'张三',
             companyId:888
             }
         ];
}
  
let listData = this.handleDuplicateRemoval(list);

//listData为根据name去重之后新的数组
}