JS construction linked list

Master the way of constructing linked list , It is very convenient to debug code on the local editor ~

The way 1：

const l1 = {
    
	val: 1,
    next: {
    
        val: 2,
        next: {
     
            val: 4, 
            next: null 
        },
    },
};

The way 2：

function ListNode(val){
    
    this.val = val;
    this.next = null;
}

// 4->5->1->9
var node1 = new ListNode(4);
var node2 = new ListNode(5);
var node3 = new ListNode(1);
var node4 = new ListNode(9);

node1.next = node2;
node2.next = node3;
node3.next = node4;