class LinkedListNode { constructor(data) { this.data = data; this.next = null; } } class LinkedList { constructor() { this.head = null; this.size = 0; } isEmpty() { return this.size === 0; } insert(data) { const newNode = new LinkedListNode(data); if (this.head !== null) { newNode.next = this.head; } this.head = newNode; this.size++; } remove(data) { if (this.head.data === data) { this.head = th..