@@ -4,7 +4,6 @@ class Node {
44 this . data = data ;
55 this . previous = previous ;
66 this . next = next ;
7- this . length = 0 ;
87 }
98}
109
@@ -16,30 +15,31 @@ class DoublyLinkedList {
1615 this . tail = new Node ( null , null , null ) ;
1716 this . head . next = this . tail ; // head next point to tail
1817 this . tail . previous = this . head ; // tail previous point to head
18+ this . size = 0 ;
1919 }
2020
2121 addAtBeginning ( value ) {
2222 const newNode = new Node ( value , this . head , this . head . next ) ;
2323 this . head . next . previous = newNode ;
2424 this . head . next = newNode ;
25- this . length += 1 ;
25+ this . size += 1 ;
2626 }
2727
2828 addAtEnd ( value ) {
2929 const newNode = new Node ( value , this . tail . previous , this . tail ) ;
3030 this . tail . previous . next = newNode ;
3131 this . tail . previous = newNode ;
32- this . length += 1 ;
32+ this . size += 1 ;
3333 }
3434
3535 removeAtBeginning ( ) {
3636 this . remove ( this . head . next ) ;
37- this . length -= 1 ;
37+ this . size -= 1 ;
3838 }
3939
4040 removeAtEnd ( ) {
4141 this . remove ( this . tail . previous ) ;
42- this . length -= 1 ;
42+ this . size -= 1 ;
4343 }
4444
4545 remove ( node ) {
@@ -50,7 +50,7 @@ class DoublyLinkedList {
5050 }
5151
5252 length ( ) {
53- return this . length ;
53+ return this . size ;
5454 }
5555
5656 display ( ) {
@@ -62,6 +62,4 @@ class DoublyLinkedList {
6262 }
6363}
6464
65- module . exports = {
66- DoublyLinkedList,
67- } ;
65+ module . exports = DoublyLinkedList ;
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