Simplify linked-list reverse method

src/data-structures/linked-list.js

@@ -258,21 +258,19 @@
     if (!this.first || !this.first.next) {
       return;
     }
-    var current = this.first.next;
-    var prev = this.first;
-    var temp;
-    while (current) {
-      temp = current.next;
-      current.next = prev;
-      prev.prev = current;
-      prev = current;
-      current = temp;
-    }
-    this.first.next = null;
-    this.last.prev = null;
-    temp = this.first;
-    this.first = prev;
-    this.last = temp;
+    var current = this.first
+    var next
+
+    do {
+      next = current.next
+      current.next = current.prev
+      current.prev = next
+      current = next
+    } while (next)
+
+    var tmp = this.first
+    this.first = this.last
+    this.last = tmp
   };
 
 })(typeof window === 'undefined' ? module.exports : window);