strategies to reverse a linked list in JavaScript

Question

I just struggled through a simple interview question: Please reverse a singly linked list.

While I failed to provide a working answer in time to save the interview,

Answer 1

Reversing the SinglyLinkedList: Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL

To understand The Solution we have to keep track of previous head and next variables for example in above input Head = 1 ; next = 2 we don't have previous so assume previous = null loop the list till head is not null. reverse the connections(previous and next) of head. Below is the code

var reverseList = function(head) {
    let previous = null;
    while(head !== null){
        let next = head.next;
        head.next = previous;
        previous= head
        head = next;
    }
    return previous;
    
};