diff --git a/Chapter6/chap6-4.txt b/Chapter6/chap6-4.txt
index 4a78c04..95eb57f 100644
--- a/Chapter6/chap6-4.txt
+++ b/Chapter6/chap6-4.txt
@@ -35,7 +35,10 @@ function remove(item) {
var currNode = this.find(item);
if (!(currNode.next == null)) {
currNode.previous.next = currNode.next;
- currNode.next.previous = currNode.previous;
+ // if we try to remove last element in the list via this method it will fail as previous of null.
+ if (current.next !== null) {
+ currNode.next.previous = currNode.previous;
+ }
currNode.next = null;
currNode.previous = null;
}
@@ -72,6 +75,10 @@ function insert(newElement, item) {
var current = this.find(item);
newNode.next = current.next;
newNode.previous = current;
+ // if there is next element than it should have previous reference to current one or else it would preserve reference to it's previous element in th list
+ if (newNode.next) {
+ newNode.next.previous = newNode;
+ }
current.next = newNode;
}
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