I was a bit luckier than you Graham. The first time I saw the Solo Colon, its capabilities were being demonstrated to me and was told that it has to be the only character on that line, just like the closing parens ) should be the only character in the line to close a verb.
I never questioned it ... I'm a sheep that way. :P ;) -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Graham Parkhouse Sent: Tuesday, August 17, 2010 4:25 PM To: programming@jsoftware.com Subject: [Jprogramming] Solo colon Both JfC and LJ mention a 'solo colon' separating the monadic from the dyadic cases of an explicit verb. Unaware of this, I got caught out recently by adding a comment after the colon. J doesn't like it! foo=: 3 : 0 -y : x-y ) foo 3 _3 5 foo 3 2 0K! But ... foo=: 3 : 0 -y : NB. No comments allowed on this line! x-y ) foo 3 |value error: x | x-y 5 foo 3 |domain error: foo | 5 foo 3 It appears that the colon should be oh so solo! Regards Graham ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
