Demo changes

examples/demo.monkey

@@ -40,4 +40,4 @@ let map = fn(arr, f) {
 };
 
 let numbers = [1, 1 + 1, 4 - 1, 2 * 2, 2 + 3, 12 / 2];
-map(numbers, fibonacci);
+//map(numbers, fibonacci);

examples/fact.monkey

@@ -0,0 +1,8 @@
+let fact = fn(n) {
+  if (n == 0) {
+    return 1
+  }
+  return n * fact(n - 1)
+}
+
+print(fact(5)

examples/factt.monkey

@@ -0,0 +1,8 @@
+	let fact = fn(n, a) {
+  if (n == 0) {
+    return a
+  }
+  return fact(n - 1, a * n)
+}
+
+print(fact(5, 1))

examples/hello.monkey

@@ -0,0 +1 @@
+print("Hello World!")