Added lot more example code. (0.39.8).

examples/basics/fibonacci.fun

@@ -0,0 +1,38 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2026 Johannes Findeisen
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2026-03-25
+ */
+
+// Fibonacci: iterative and recursive
+
+fun fib_iter(n)
+  if (n <= 1) return n
+  a = 0
+  b = 1
+  i = 2
+  while (i <= n)
+    t = a + b
+    a = b
+    b = t
+    i = i + 1
+  return b
+
+fun fib_rec(n)
+  if (n <= 1) return n
+  return fib_rec(n - 1) + fib_rec(n - 2)
+
+print("fib_iter(10) = " + to_string(fib_iter(10)))
+print("fib_rec(10) = " + to_string(fib_rec(10)))
+
+/* Expected output:
+fib_iter(10) = 55
+fib_rec(10) = 55
+*/