This is a feature I'm planning to add to ParenScript that involves eager evaluation for arithmetic constants, so for example: (js (+ foo.bar 0)) => "foo.bar;" (js (+ foo.bar 1 -1)) => "foo.bar;" (js (+ foo.bar 2 3)) => "foo.bar + 5;" This would make the generated Javascript be a few bytes shorter, but more importantly it seems that many Javascript implementations don't do constant arithmetic optimizations themselves, so it would speed up the generated Javascript as well.