https://leetcode.com/problems/remove-duplicates-from-sorted-list/

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/**
 * Definition for singly-linked list.
 * function ListNode(val) {
 *     this.val = val;
 *     this.next = null;
 * }
 */
/**
 * @param {ListNode} head
 * @return {ListNode}
 */
var deleteDuplicates = function(head) {
    let p = head
    while(p) {
        if (p.next && p.val === p.next.val) {
            p.next = p.next.next
        } else {
            p = p.next
        }
    }
    return head
};