203-Remove-Linked-List-Elements.js

/**
 * Definition for singly-linked list.
 * function ListNode(val, next) {
 *     this.val = (val===undefined ? 0 : val)
 *     this.next = (next===undefined ? null : next)
 * }
 */
/**
 * @param {ListNode} head
 * @param {number} val
 * @return {ListNode}
 */
const removeElements = (head, val) => {
    if (!head) return head;

    while (head && head.val === val) {
        head = head.next;
    }

    let curr = head;
    while (curr) {
        if (!curr.next) break;

        if (curr.next.val === val) {
            curr.next = curr.next.next;
        } else {
            curr = curr.next;
        }
    }

    return head;
};