Void is a peculiar thing. It is used by Racket where no result is ment. But every expression must have a (multiple) value (if it computes in finite time) Because the value of (void) has to be considered to be the absence of a value, the repl and the interactions window do not show them. For example in the interactions window:
(void) -> no response (write (void)) writes '#<void>'. It seems difficult to represent the absence of a value. Why not returing the value of (values)? A problem, because in many cases where no value matters, Racket does require a value. The absence of a value in may cases is a value, namely the value of (void). Where you use (values) in many cases problems arise. Off topic: For me the unanswered question remains: Does the vacuum exist or does it not exist? I don't know. Jos -----Original Message----- From: users [mailto:[email protected]] On Behalf Of Hendrik Boom Sent: 05 January 2015 19:24 To: racket users list Subject: [racket] Void expression found On Sun, Jan 04, 2015 at 11:25:52PM -0500, Alexander D. Knauth wrote: > will (void) not work? Only if you know it exists. Thank you. Every language has a few essential trivia that are hard to find in the documentation. Eventually you learn how the documentation is organised and you can find them easily (in case you forget them), but until then ... -- hendrik ____________________ Racket Users list: http://lists.racket-lang.org/users ____________________ Racket Users list: http://lists.racket-lang.org/users
