Update Queue.md

Author: ps0305

Basic Data Structures/Implementation of Queue in Javascript/Queue.md

@@ -97,3 +97,22 @@ export default class Queue {
   }
 }
 ```
+> **If the direction is reversed, we can replace unshift and pop with push and shift, respectively.**
+
+```
+class Queue {
+  constructor(...items) {
+    this.reverse = false;
+    this.queue = [...items];
+  }
+
+  enqueue(...items) {
+    return this.reverse
+      ? this.queue.push(...items)
+      : this.queue.unshift(...items);
+  }
+
+  dequeue() {
+    return this.reverse ? this.queue.shift() : this.queue.pop();
+  }
+}