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Learning JavaScript Data Structures and Algorithms

You're reading from   Learning JavaScript Data Structures and Algorithms JavaScript Data Structures and algorithms can help you solve complex development problems – learn how by exploring a huge range of JavaScript data types

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Product type Paperback
Published in Oct 2014
Publisher Packt
ISBN-13 9781783554874
Length 218 pages
Edition 1st Edition
Languages
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Author (1):
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Loiane Avancini Loiane Avancini
Author Profile Icon Loiane Avancini
Loiane Avancini
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Toc

Doubly linked lists

There are some different types of linked lists. In this section, we are going to cover the doubly linked list. The difference between a doubly linked list and a normal linked list is that in the linked list we make the link from one node to the next one only. In the doubly linked list, we have a double link: one for the next element and one for the previous element, as shown in the following diagram:

Doubly linked lists

Let's get started with the changes that are needed to implement the DoublyLinkedList class:

function DoublyLinkedList() {

    var Node = function(element){

        this.element = element;
        this.next = null;
        this.prev = null; //NEW
    };

    var length = 0;
    var head = null;
    var tail = null; //NEW

    //methods here
}

As we can see in this code, the differences between the LinkedList class and the DoublyLinkedList class are marked by NEW. Inside the Node class we have the prev attribute (a new pointer) and inside the DoublyLinkedList class we...

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