From 8e8f28ffcf475ff869ec47d05f8753d8fac7117a Mon Sep 17 00:00:00 2001
From: H2rmone <3357458@qq.com>
Date: Fri, 28 Jan 2022 03:36:39 +0800
Subject: [PATCH] Use exist method to be consistent with Stack (#708)

---
 src/data-structures/queue/Queue.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/data-structures/queue/Queue.js b/src/data-structures/queue/Queue.js
index f6ec6d2d..64e646fc 100644
--- a/src/data-structures/queue/Queue.js
+++ b/src/data-structures/queue/Queue.js
@@ -21,7 +21,7 @@ export default class Queue {
    * @return {*}
    */
   peek() {
-    if (!this.linkedList.head) {
+    if (this.isEmpty()) {
       return null;
     }