The same thing will "gotcha" if you add a comment on the same line as the solo closing paren at the end of a definition, e.g.
worksOK=: 3 : 0 foo y ) NotOK=: 3 : 0 foo y ) NB. This comment messes NB. things up - this function not yet closed. ) NB. But now it is. NB. However, the definition of NotOK is invalid: foo=: - NotOK 3 |syntax error: NotOK | ) On Tue, Aug 17, 2010 at 4:25 AM, Graham Parkhouse < graham.parkho...@ntlworld.com> wrote: > 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 > -- Devon McCormick, CFA ^me^ at acm. org is my preferred e-mail ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
