JS convert string to array object

The first way to write it

let str = "1,2,3"
let arr = str.split(",").map((item)=>{
    
	for(let i = 0;i<str.length;i++){
    
		let obj = {
    };
		obj.name = item;
		return obj
	}
})
console.log(arr) 

The results are as follows ：

The second way

let str = "1,2,3";
let arr = str.split(",");
for(let i = 0;i<arr.length;i++){
    
	arr[i] = {
     name1: arr[i]};
}
console.log(arr)

The results are as follows ：