Could you explain what a linked list is in the context of Node.js?

A linked list is a data structure consisting of nodes, where each node contains data and a reference (or pointer) to the next node in the list. In the context of Node.js, linked lists are often implemented using objects, where each object has a field to store the value and a field for the reference to the next element.

Linked lists are useful when you need to efficiently insert or delete elements in the middle of a collection, as these operations do not require shifting elements like in arrays.

Example of a simple singly linked list in JavaScript:

class Node {
  constructor(value) {
    this.value = value;
    this.next = null;
  }
}

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

  append(value) {
    const newNode = new Node(value);
    if (!this.head) {
      this.head = newNode;
      return;
    }
    let current = this.head;
    while (current.next) {
      current = current.next;
    }
    current.next = newNode;
  }
}