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

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

labs/04/modules/fileManager.js

@@ -0,0 +1,26 @@
+const fs = require("fs");
+const path = require("path");
+
+class FileManager {
+	constructor(baseDir) {
+		this.baseDir = baseDir;
+	}
+
+	resolve(fileName) {
+		return path.join(this.baseDir, path.basename(fileName));
+	}
+
+	exists(fileName) {
+		return fs.existsSync(this.resolve(fileName));
+	}
+
+	append(fileName, text) {
+		fs.appendFileSync(this.resolve(fileName), `${text}\n`);
+	}
+
+	read(fileName) {
+		return fs.readFileSync(this.resolve(fileName), "utf8");
+	}
+}
+
+module.exports = FileManager;

labs/04/modules/math.js

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+const PI = 3.141592654;
+
+exports.add = (a, b) => {
+	return a + b
+}
+
+exports.subtract = (a, b) => {
+	return a - b
+}
+
+exports.area = (r) => {
+	return 2*PI*r;
+}

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;