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

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

labs/04/modules/math.js

@@ -0,0 +1,13 @@
+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;
+}