[Jprogramming] [Jbeta] conditionals

[Raul Miller]

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Yes:

=: definitions survive in the current locale (which defaults to 'base').

=. definitions end when the current explicit context ends.

'load' happens in a local context (which was generated specifically to
intercept =. definitions in the loaded file).

-- 
Raul

On Mon, Oct 31, 2011 at 12:55 AM, Andrew Pennebaker
<andrew.pennebaker at gmail.com> wrote:
> I think I understand, but I want to put it in my words to double-check.
>
> Declarations that are to be exposed to code that loads this J file should
> use =: for assignment, and local declarations inside of code blocks should
> use =. Right?
>
> Cheers,
>
> Andrew Pennebaker
> www.yellosoft.us
>
> On Sun, Oct 30, 2011 at 10:18 PM, Don Guinn <donguinn at gmail.com> wrote:
>
>> In immediate mode it makes no difference. With explicit verbs or whatever
>> names which are to be retained after the verb finishes should be assigned
>> using global copula (=:). Other assignments in the definition should be
>> local (=.) so the names go away after the verb ends. That way the names
>> don't clutter up your work space and possibly accidentally overwrite a name
>> you want to retain.
>>
>> On Sun, Oct 30, 2011 at 7:13 PM, Andrew Pennebaker <
>> andrew.pennebaker at gmail.com> wrote:
>>
>> > Thanks Don. If there's no particular reason to use globals, should I use
>> =.
>> > every place in my code?
>> >
>> > Cheers,
>> >
>> > Andrew Pennebaker
>> > www.yellosoft.us
>> >
>> > On Sun, Oct 30, 2011 at 5:03 PM, Don Guinn <donguinn at gmail.com> wrote:
>> >
>> > > =: is a global copula. =. is a local copula within explicit
>> definitions.
>> > In
>> > > immediate mode or not enclosed in an explicit definition is the same as
>> > =:
>> > > . Need to be aware that if you use "load" that puts the script within
>> an
>> > > explicit definition. So =. produces a local definition that disappears
>> > when
>> > > the "load" verb ends.
>> > >
>> > > On Sun, Oct 30, 2011 at 2:37 PM, Andrew Pennebaker <
>> > > andrew.pennebaker at gmail.com> wrote:
>> > >
>> > > > What's the difference between =: and =. ?
>> > > >
>> > > > Cheers,
>> > > >
>> > > > Andrew Pennebaker
>> > > > www.yellosoft.us
>> > > >
>> > > > 2011/10/30 Björn Helgason <gosinn at gmail.com>
>> > > >
>> > > > >   happy=.0
>> > > > >   > happy #  <'clap hands'
>> > > > >
>> > > > >   happy=.1
>> > > > >   > happy #  <'clap hands'
>> > > > > clap hands
>> > > > >
>> > > > >
>> > > > > 2011/10/30 Andrew Pennebaker <andrew.pennebaker at gmail.com>
>> > > > >
>> > > > > > J won't let me write if. ... end. by itself; it must be enclosed
>> > in a
>> > > > > > function definition. E.g., I'd like to do this:
>> > > > > >
>> > > > > > if. happy do.
>> > > > > >   clapHands
>> > > > > > end.
>> > > > > >
>> > > > > > Rather than:
>> > > > > >
>> > > > > > arewehappy =: monad : 0
>> > > > > >   if. happy do.
>> > > > > >      clapHands
>> > > > > >   end.
>> > > > > > )
>> > > > > >
>> > > > > > arewehappy 0
>> > > > > >
>> > > > > > Can we add the ability to do the former to J?
>> > > > > >
>> > > > > > By the way, what's the preferred notation for long variable and
>> > > > function
>> > > > > > names? camelCase? with_underscores?
>> > > > > >
>> > > > > > Cheers,
>> > > > > >
>> > > > > > Andrew Pennebaker
>> > > > > > www.yellosoft.us
>> > > > > >
>> > > ----------------------------------------------------------------------
>> > > > > > For information about J forums see
>> > > http://www.jsoftware.com/forums.htm
>> > > > > >
>> > > > >
>> > > > >
>> > > > >
>> > > > > --
>> > > > > Björn Helgason, Verkfræðingur
>> > > > > Fornustekkum II
>> > > > > 781 Hornafirði,
>> > > > > t-póst: gosinn at gmail.com
>> > > > > gsm: +3546985532
>> > > > > twitter: @flugfiskur
>> > > > > http://groups.google.com/group/J-Programming
>> > > > >
>> > > > >
>> > > > > Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari
>> > > einfaldleikans
>> > > > >
>> > > > > góður kennari getur stigið á tær án þess að glansinn fari af skónum
>> > > > >          /|_      .-----------------------------------.
>> > > > >         ,'  .\  /  | Með léttri lund verður        |
>> > > > >     ,--'    _,'   | Dagurinn í dag                     |
>> > > > >    /       /       | Enn betri en gærdagurinn  |
>> > > > >   (   -.  |        `-----------------------------------'
>> > > > >   |     ) |         (\_ _/)
>> > > > >  (`-.  '--.)       (='.'=)   ♖♘♗♕♔♙
>> > > > >   `. )----'        (")_(") ☃☠
>> > > > >
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>> > > > >
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