javascript 数组和对象遍历的问题

Question

var arr =[{id:1,name:'name1'},{id:4,name:'name2'},{id:5,name:'name3'}];想把 arr这个数组最后变成下面对象的格式obj ={1:'name1',4:'name2',5:'name3'};怎么实现？

Answer 1

var arr =[{id:1,name:'name1'},{id:4,name:'name2'},{id:5,name:'name3'}]

var obj = {};

for(var i in arr){

    var d = arr[i].name;

    var e = arr[i].id;

    obj[e] = d;    

}

low不

Answer 2

let obj = {};

arr.forEach(a => obj[a['id']] = a['name']);

console.log(obj);