From 1384d7ea4e80eaa6b195195af81de974575b2bb0 Mon Sep 17 00:00:00 2001
From: omalinov <ognyan.m@coherent-labs.com>
Date: Sun, 21 Oct 2018 17:36:32 +0300
Subject: Lexer/homework (#15)

* Initial commit

* code is formatted

* Homework finished

* Genie project generation.

* Updated code with new constructors
---
 homework/45183/CodeFormatting/input2.js | 71 +++++++++++++++++++++++++++++++++
 1 file changed, 71 insertions(+)
 create mode 100644 homework/45183/CodeFormatting/input2.js

(limited to 'homework/45183/CodeFormatting/input2.js')

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
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