Reverse LinkedList (Iterative)

let reverseLinkedList = function(root) {

    let reverse = new ListNode(0);

    let node = root;
    while (node) {
        let toAdd = node;
        let next = node.next;

        let reversedNext = reverse.next;
        toAdd.next = reversedNext;
        reverse.next = toAdd; //

        node = next;
    }
    return reverse.next;
}