find the average of all nodes in a linked list in typescript

index.ts
class Node {
  public value: number;
  public next: Node;
  constructor(value: number) {
    this.value = value;
    this.next = null;
  }
}

class LinkedList {
  private head: Node;
  constructor() {
    this.head = null;
  }

  public add(value: number): void {
    let node = new Node(value);
    if (!this.head) {
      this.head = node;
    } else {
      let current: Node = this.head;
      while (current.next) {
        current = current.next;
      }
      current.next = node;
    }
  }

  public getAverage(): number {
    let sum: number = 0;
    let count: number = 0;
    let current: Node = this.head;

    while (current) {
      sum += current.value;
      count++;
      current = current.next;
    }

    if (count === 0) {
      return 0;
    }

    return sum / count;
  }
}

// Example usage
let list = new LinkedList();
list.add(5);
list.add(10);
list.add(15);
console.log(list.getAverage()); // Output: 10
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