Short circiut (||, &&)

examples/short_circuit_test.fun

@@ -0,0 +1,36 @@
+#!/usr/bin/env fun
+
+// Short-circuit demo for || and &&
+
+print("=== short-circuit demo ===")
+
+fun mark(name, v)
+  // Show when this branch is evaluated
+  print(name)
+  return v
+
+// OR short-circuits: RHS not evaluated when LHS is true
+if (true || mark("OR-RHS", 0))
+  print(1)          // expect: prints 1; no "OR-RHS"
+else
+  print(0)
+
+// AND short-circuits: RHS not evaluated when LHS is false
+if (false && mark("AND-RHS", 1))
+  print(1)
+else
+  print(0)          // expect: prints 0; no "AND-RHS"
+
+// OR evaluates RHS when needed (LHS false)
+if (false || mark("OR-NEEDED", 1))
+  print(1)          // expect: prints "OR-NEEDED" then 1
+else
+  print(0)
+
+// AND evaluates RHS when needed (LHS true)
+if (true && mark("AND-NEEDED", 1))
+  print(1)          // expect: prints "AND-NEEDED" then 1
+else
+  print(0)
+
+print("=== end ===")