fix: use private variables

codes/javascript/chapter_stack_and_queue/array_queue.js

@@ -7,29 +7,29 @@
 
 /* 基于环形数组实现的队列 */
 class ArrayQueue {
-    queue;     // 用于存储队列元素的数组
+    #queue;     // 用于存储队列元素的数组
-    front = 0;  // 头指针，指向队首
+    #front = 0;  // 头指针，指向队首
-    rear = 0;   // 尾指针，指向队尾 + 1
+    #rear = 0;   // 尾指针，指向队尾 + 1
-    CAPACITY = 1e5;
+    #CAPACITY = 1e5;
 
     constructor(capacity) {
-        this.queue = new Array(capacity ?? this.CAPACITY);
+        this.#queue = new Array(capacity ?? this.CAPACITY);
     }
 
     /* 获取队列的容量 */
     get capacity() {
-        return this.queue.length;
+        return this.#queue.length;
     }
 
     /* 获取队列的长度 */
     get size() {
         // 由于将数组看作为环形，可能 rear < front ，因此需要取余数
-        return (this.capacity + this.rear - this.front) % this.capacity;
+        return (this.capacity + this.#rear - this.#front) % this.capacity;
     }
 
     /* 判断队列是否为空 */
     empty() {
-        return this.rear - this.front == 0;
+        return this.#rear - this.#front == 0;
     }
 
     /* 入队 */
@@ -39,16 +39,16 @@ class ArrayQueue {
             return;
         }
         // 尾结点后添加 num
-        this.queue[this.rear] = num;
+        this.#queue[this.#rear] = num;
         // 尾指针向后移动一位，越过尾部后返回到数组头部
-        this.rear = (this.rear + 1) % this.capacity;
+        this.#rear = (this.#rear + 1) % this.capacity;
     }
 
     /* 出队 */
     poll() {
         const num = this.peek();
         // 队头指针向后移动一位，若越过尾部则返回到数组头部
-        this.front = (this.front + 1) % this.capacity;
+        this.#front = (this.#front + 1) % this.capacity;
         return num;
     }
 
@@ -57,14 +57,14 @@ class ArrayQueue {
         // 删除头结点
         if (this.empty())
             throw new Error("The queue is empty!");
-        return this.queue[this.front];
+        return this.#queue[this.#front];
     }
 
     /* 访问指定索引元素 */
     get(index) {
         if (index >= this.size)
             throw new Error("Index out of bounds!");
-        return this.queue[(this.front + index) % this.capacity];
+        return this.#queue[(this.#front + index) % this.capacity];
     }
 
     /* 返回 Array */
@@ -73,8 +73,8 @@ class ArrayQueue {
         const cap = this.capacity;
         // 仅转换有效长度范围内的列表元素
         const arr = new Array(siz);
-        for (let i = 0, j = this.front; i < siz; i++, j++) {
+        for (let i = 0, j = this.#front; i < siz; i++, j++) {
-            arr[i] = this.queue[j % cap];
+            arr[i] = this.#queue[j % cap];
         }
         return arr;
     }

docs/chapter_stack_and_queue/queue.md

@@ -938,49 +938,6 @@ comments: true
             return arr;
         }
     }
-
-    /* 初始化队列 */
-    const capacity = 10;
-    const queue = new ArrayQueue(capacity);
-
-    /* 元素入队 */
-    queue.offer(1);
-    queue.offer(3);
-    queue.offer(2);
-    queue.offer(5);
-    queue.offer(4);
-    console.log("队列 queue = ");
-    console.log(queue.toArray());
-
-    /* 访问队首元素 */
-    const peek = queue.peek();
-    console.log("队首元素 peek = " + peek);
-
-    /* 访问指定索引元素 */
-    const num = queue.get(2);
-    console.log("队列第 3 个元素为 num = " + num);
-
-    /* 元素出队 */
-    const poll = queue.poll();
-    console.log("出队元素 poll = " + poll + "，出队后 queue = ");
-    console.log(queue.toArray());
-
-    /* 获取队列的长度 */
-    const size = queue.size;
-    console.log("队列长度 size = " + size);
-
-    /* 判断队列是否为空 */
-    const empty = queue.empty();
-    console.log("队列是否为空 = " + empty);
-
-    /* 测试环形数组 */
-    for (let i = 0; i < 10; i++) {
-        queue.offer(i);
-        queue.poll();
-        console.log("第 " + i + " 轮入队 + 出队后 queue = ");
-        console.log(queue.toArray());
-    }
-
     ```
 
 === "C"