That sounds sort of neat, but I cannot think of a non-contrived case where this would be useful.
-- Raul On Thu, Mar 2, 2017 at 2:29 AM, 'Pascal Jasmin' via Programming <[email protected]> wrote: > The difference with the fcase. example at > http://www.jsoftware.com/help/dictionary/csel.htm > > is the "case 2;3" line below pcase. where the fcase. example that line is > "case 3" > > fcase triggers "2 conditions", but the 2nd is triggered automatically even > though the input doesn't match that conditions' test. > > pcase. would require that the input match a subsequent condition to be > further triggered. > > an example of the basic case statement > > > 3 : 'select. y case. 1;2 do. 11 case. 2;3 do. 12 end.' 2 > 11 > 3 : 'select. y fcase. 1;2 do. 11 case. 3 do. 12 end.' 2 > 12 > > only the first condition gets triggered with case. with fcase. the 2nd non > matching condition gets returned, though first has chance to impose side > effects. With pcase. the 2nd condition would get returned only if it also > matched the input. > > > > > ----- Original Message ----- > From: Henry Rich <[email protected]> > To: [email protected] > Sent: Wednesday, March 1, 2017 10:44 PM > Subject: Re: [Jprogramming] fcase. > > ? > > change your pcase. to fcase.; doesn't it do what you say? Is there > something your proposed idea would do that the current syntax doesn't do? > > Henry Rich > > On 3/1/2017 10:14 PM, 'Pascal Jasmin' via Programming wrote: >> Do not see the usefulness of the fcase. option. see example here: >> http://www.jsoftware.com/help/dictionary/csel.htm >> >> >> I would see a "passthrough case" pcase. usefulness >> >> f2=: 3 : 0 >> t=. '' >> select. y >> case. 1 do. t=.t,'one ' >> pcase. 2 do. t=.t,'two ' >> case. 2;3 do. t=.t,'three ' >> case. 2;3;4 do. t=.t,'four ' >> end. >> ) >> >> f2 2 >> two three >> >> a pcase. statement would not abort search after a match. >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm > > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
