feat: add forfor.zig, optionals.zig

single_files/optionals.zig

@@ -0,0 +1,7 @@
+const print = @import("std").debug.print;
+
+pub fn main() void {
+  var a: ?i32 = null;
+  var b = a orelse 1;
+  print("{} {} \n", .{a, b});
+}