Minor cleanupdll

1 files changed, 2 insertions, 4 deletions

diff --git a/lib/internal/DoublyLinkedList.js b/lib/internal/DoublyLinkedList.js
index ae46957..79c3bb5 100644
--- a/lib/internal/DoublyLinkedList.js
+++ b/lib/internal/DoublyLinkedList.js
@@ -13,7 +13,6 @@ function setInitial(dll, node) {
 }
 
 DLL.prototype.removeLink = function(node) {
-    if (!node) return node;
     if (node.prev) node.prev.next = node.next;
     else this.head = node.next
     if (node.next) node.next.prev = node.prev;
@@ -54,11 +53,10 @@ DLL.prototype.push = function(node) {
     else setInitial(this, node);
 };
 
-
 DLL.prototype.shift = function() {
-    return this.removeLink(this.head);
+    return this.head && this.removeLink(this.head);
 };
 
 DLL.prototype.pop = function() {
-    return this.removeLink(this.tail);
+    return this.tail && this.removeLink(this.tail);
 };