lab 04: node debugging, GET date API, file read/write (OOP)

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

labs/04/modules/utils.js

@@ -0,0 +1,19 @@
+class Utils {
+	getDate() {
+		return new Date().toString();
+	}
+
+	format(template, ...values) {
+		return template.replace(/%(\d+)/g, (match, index) => {
+			const value = values[Number(index) - 1];
+			return value === undefined ? match : value;
+		});
+	}
+
+	escapeHtml(text) {
+		const entities = {"&": "&amp;", "<": "&lt;", ">": "&gt;", "\"": "&quot;", "'": "&#39;"};
+		return text.replace(/[&<>"']/g, (char) => entities[char]);
+	}
+}
+
+module.exports = Utils;