IO: myand := method( if(call evalArgAt(0), call evalArgAt(1), false) ) myand(true, 3 println) # prints 3 to stdout myand(false, 3 pri

IO: myand := method( if(call evalArgAt(0), call evalArgAt(1), false) ) myand(true, 3 println) # prints 3 to stdout myand(false, 3 println) # nothing happens This should also be possible in TCL. Scala has some kind of lazily eval'ed arguments, too. And, of course, Haskell has this built-in. EDIT: better example code.