Over-knight

 class ArrayJoy {
   elements: string[];
   private length: number
   private index :number;
 

   constructor(elements: string[]){
    this.elements = elements;
    this.length = elements.length;
    if (elements.length === 0) {

Over-knight

// class LNode {
//     value: number;
//     next: LNode | null; 

//     constructor(value: number) {
//         this.value = value;
//         this.next = null;
//     }
// }