From 5eea37837f1e7f7b0160fe2f50c48298555d4465 Mon Sep 17 00:00:00 2001
From: Oleksii Trekhleb <trehleb@gmail.com>
Date: Fri, 17 Aug 2018 17:47:29 +0300
Subject: [PATCH] Add annotations to Queue.

---
 src/data-structures/queue/Queue.js | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/data-structures/queue/Queue.js b/src/data-structures/queue/Queue.js
index 49332400..74cf7095 100644
--- a/src/data-structures/queue/Queue.js
+++ b/src/data-structures/queue/Queue.js
@@ -5,10 +5,16 @@ export default class Queue {
     this.linkedList = new LinkedList();
   }
 
+  /**
+   * @return {boolean}
+   */
   isEmpty() {
     return !this.linkedList.tail;
   }
 
+  /**
+   * @return {*}
+   */
   peek() {
     if (!this.linkedList.head) {
       return null;
@@ -17,15 +23,25 @@ export default class Queue {
     return this.linkedList.head.value;
   }
 
+  /**
+   * @param {*} value
+   */
   enqueue(value) {
     this.linkedList.append(value);
   }
 
+  /**
+   * @return {*}
+   */
   dequeue() {
     const removedHead = this.linkedList.deleteHead();
     return removedHead ? removedHead.value : null;
   }
 
+  /**
+   * @param [callback]
+   * @return {string}
+   */
   toString(callback) {
     return this.linkedList.toString(callback);
   }