[Jprogramming] invoking object verbs without polluting global namespace

[bill lam]

Actaully it switches back if the verb is named (not necessarily
explicit). eg.  define a script (say a1.ijs) with 3 lines

cocurrent 'a1'
smoutput coname''
''

and try the followings.

  0!:0 <'a1.ijs'
  coname ''

and start a new session


  lod=: 0!:0
  lod <'a1.ijs'
  coname ''


incidentally, load any scripts with the utility verb load 
will not switch the current locale.  Not sure where this is
documented.


Пн, 09 ноя 2015, Joe Bogner написал(а):
> On Mon, Nov 9, 2015 at 9:34 AM, Raul Miller <rauldmiller at gmail.com> wrote:
> > On Mon, Nov 9, 2015 at 8:22 AM, Joe Bogner <joebogner at gmail.com> wrote:
> >> Thank you. I had this thought as well but couldn't get it to work. I
> >> may not have  a full grasp on how cocurrent works
> >>
> >> I define st as 'switch to table locale' and sb as 'switch to base locale'
> >>
> >> I defined them explicitly
> >>
> >> My first attempt:
> > ...
> >> sb=: 3 : 0
> >> cocurrent 'base'
> >> y
> >> )
> >
> > http://www.jsoftware.com/help/dictionary/dx018.htm
> >
> > "
> > 18!:4 y
> > Switch Current. Switch the current locale to y at the end of the
> > currently executing named verb. Initially the current locale is base .
> > "
> 
> Thanks, I read that initially but still don't understand it,
> specifically 'the end of the currently executing named verb'.
> 
>    cocurrent
> 18!:4 at boxxopen
> 
> If I type cocurrent 'base' , I would assume  cocurrent is the
> currently executing named verb and it switched to base after the end
> of cocurrent
> 
> Given that understanding, why would it switch back at the end of the
> explicit definition? Is that behavior documented somewhere?
> 
> 
> >
> > You either need to use ([ cocurrent bind 'base') instead of sb, or use
> > 18!:4 in sb .
> >
> 
> I had forgotten about bind
> 
> ([ cocurrent@('base'"_1)) 2
> 
> 
> http://code.jsoftware.com/wiki/Vocabulary/quotem
> 
> I typically use & to bind parameters. & cannot be used on cocurrent
> because it's monadic, is that the correct interpretation?
> 
> NB. basic monadic verb
> add1 =: 3 : 'y+1'
> 
> NB. no & allowed
> (add1&3) 0
> |domain error: add1
> 
> NB. bind works
>    (add1 bind 3) 100
> 4
> 
> NB. & works fine when defined dyadic
>    add1d =: 4 : 'y+1'
>    (add1 & 3) 1
> 4
> 
> NB. no bind on dyadic
>    (add1d bind 3) 1
> |domain error: add1d
> |       (add1d bind 3)1
> 
> 
> Is there a way to determine the valence of a tacit verb?
> 
> My first thought was ar, but that didn't seem to help:
> 
>    5!:1 (<'cocurrent')
> ┌──────────────────────────────────┐
> │┌─┬──────────────────────────────┐│
> ││@│┌───────────────────┬────────┐││
> ││ ││┌──┬──────────────┐│boxxopen│││
> ││ │││!:│┌──────┬─────┐││        │││
> ││ │││  ││┌─┬──┐│┌─┬─┐│││        │││
> ││ │││  │││0│18│││0│4││││        │││
> ││ │││  ││└─┴──┘│└─┴─┘│││        │││
> ││ │││  │└──────┴─────┘││        │││
> ││ ││└──┴──────────────┘│        │││
> ││ │└───────────────────┴────────┘││
> │└─┴──────────────────────────────┘│
> └──────────────────────────────────┘
> 
> 
> > locale handling has to do with name resolution - not just in terms of
> > what gets resolved, but also in terms of context.
> >
> > Thanks,
> >
> > --
> > Raul
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm

-- 
regards,
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