1 files changed, 71 insertions, 0 deletions
diff --git a/homework/45183/CodeFormatting/input2.js b/homework/45183/CodeFormatting/input2.js
new file mode 100644
index 0000000..c1c377c
--- /dev/null
+++ b/homework/45183/CodeFormatting/input2.js
@@ -0,0 +1,71 @@
+export default class Queue {
+    constructor() {
+        this._firstNode = null;
+        this._lastNode = null;
+    }
+
+    /**
+     * Retrieves the first element in the queue.
+     * It also removes it from the queue.
+     * @returns {*}
+     */
+    dequeue() {
+        if (!this._firstNode) {
+            return this._firstNode;
+        }
+
+        const payload = this._firstNode.payload;
+
+        this._firstNode = this._firstNode.next;
+
+        return payload;
+    }
+
+    /**
+     * Adds an item to the queue
+     * @param {*} item
+     */
+    enqueue(item) {
+        const newNode = {
+            payload: item,
+            next: null
+        };
+
+        if (this._firstNode === null) {
+            this._firstNode = newNode;
+            this._lastNode = newNode;
+
+        } else {
+            this._lastNode.next = newNode;
+            this._lastNode = newNode;
+        }
+    }
+
+    /**
+     * Empties the queue
+     */
+    clear() {
+        this._firstNode = null;
+        this._lastNode = null;
+    }
+
+    /**
+     * Gets the first element of the queue
+     * @returns {*}
+     */
+    top() {
+        if (!this._firstNode) {
+            return this._firstNode;
+        }
+
+        return this._firstNode.payload;
+    }
+
+    /**
+     * Checks whether the queue is empty or not
+     * @returns {boolean}
+     */
+    isEmpty() {
+        return !this._firstNode;
+    }
+}
+\ No newline at end of file