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Mastering Data Structures and Sorting Algorithms in JavaScript

Doubly Linked List (Implementation)

Explore how to implement a doubly linked list in JavaScript by creating node constructors and managing head and tail nodes. Learn to add nodes at various positions and remove nodes while maintaining list integrity. Understand the core functions that make doubly linked lists effective for managing sequential data.

We'll cover the following...

First of all, just like a singly linked list, we need to write a constructor function to create new nodes.

Node.js
function Node(data) {
  this.data = data;
  this.next = null;
  this.previous = null;
}

By default, the node’s previous and next values equal to null.

The linked list will again be a class. This class will have several properties, just like the singly linked list, such as the remove function, add function, and find function. We create a constructor with properties that every list has by default.

Node.js
class DoublyLinkedList {
  constructor() {
    this.head = null; 
    this.tail = null; 
    this.length = 0; 
  }
}

Just like the singly linked list, we start off with the tail and head value equal to null: the list doesn’t have any nodes ...