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);

Answer 3

var arr =[{id:1,name:'name1'},{id:4,name:'name2'},{id:5,name:'name3'}];
    var obj=arr.reduce(function(a,b){
        return a[b.id]=b.name,a;
    },{});
    console.log(obj);

Answer 4

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

var obj = arr.reduce((ret, item) => (ret[item.id] = item.name, ret), {})