Data commit

Task/Anonymous-recursion/Falcon/anonymous-recursion.falcon

@@ -0,0 +1,25 @@
+function fib(x)
+   if x < 0
+      raise ParamError(description|"Negative argument invalid", extra|"Fibbonacci sequence is undefined for negative numbers")
+   else
+      return (function(y)
+         if y == 0
+            return 0
+         elif y == 1
+            return 1
+         else
+            return fself(y-1) + fself(y-2)
+         end
+      end)(x)
+   end
+end
+
+
+try
+>fib(2)
+>fib(3)
+>fib(4)
+>fib(-1)
+catch in e
+> e
+end