I'm not a pro developer in any way, but my job entails some data analysis.
Executing multiple verbs on the same data is something I do whenever I'm
extracting distinct feature vectors or summary stats from raw data.
Also, same thing when working on trees Hsu-style. I'd be sad to see :0 go!
Just my 2c.
Cheers,
Raoul
Le jeu. 30 sept. 2021 à 21:25, Michal Wallace <michal.wall...@gmail.com> a
écrit :
> Huh. That's a strange thought to me.
>
> I execute a bunch of verbs on the same arguments **all the time**,
> especially when I'm working with input/output or mutable data:
>
> - parser combinators
> - virtual machines
> - terminal i/o
>
> Usually the argument in question is the empty string or some kind of state
> object.
>
> If I'm composing parsers to match your name, I want to write something
> like:
>
> (match@'Henry')`(match@'Rich')
>
> not:
>
> (match@'Rich') @ (match@'Henry')
>
> Sure, the latter works, but it's silly, and gets progressively worse as the
> size of the language grows.
>
> Sometimes the natural way to express things is left to right.
> J doesn't make you write strings or numeric arrays backwards.
>
> Thankfully, now that I have my answer, I can just use:
>
> run =:`:0
>
> ... and then redefine 'run' in the future if `:0 ever gets removed. :)
>
>
> On Thu, Sep 30, 2021 at 3:00 PM Henry Rich <henryhr...@gmail.com> wrote:
>
> > I would vote to delete u`:0 rather than extend it. Executing a bunch of
> > verbs on the same arguments? Not a very useful thing I think.
> >
> > Using [ to separate executions is The J Way. Very efficient. Train
> > yourself to get used to it.
> >
> > Newlines are even better. Then you can put a comment on each line.
> >
> > Henry Rich
> >
> > On 9/30/2021 2:42 PM, Michal Wallace wrote:
> > > That is unfortunate. Normally, I am perfectly comfortable with [ and
> @
> > > to do function composition, but sometimes I really wish to convey the
> > idea
> > > of a sequence,
> > > and it just doesn't feel like the same thing as function composition to
> > me.
> > >
> > > (So I prefer newlines to [ or @ in these situations, but then that
> wastes
> > > vertical space...)
> > >
> > > How would you feel about introducing, say,
> > > `:_1 (and perhaps `:1 ) that guaranteed a left-to-right (and
> > right-to-left)
> > > order, explicitly?
> > >
> > > `:1 would just be (|.m)`:_1
> > > `:1 would just be an alias for the current implementation,
> > > which would not change alongside `:0 if `:0 changes in the future.
> > >
> > >
> > >
> > > On Thu, Sep 30, 2021 at 2:32 PM Henry Rich <henryhr...@gmail.com>
> wrote:
> > >
> > >> You cannot count on the order. All you know is that each cell of the
> > >> result corresponds to an AR in the gerund.
> > >>
> > >> To execute short sentences the usage
> > >>
> > >> sentencen [ ... [ sentence2 [ sentence1
> > >>
> > >> can't be beat unless one of the sentences produces a modifier.
> > >>
> > >> Henry Rich
> > >>
> > >> On 9/30/2021 2:15 PM, Michal Wallace wrote:
> > >>> Today I discovered that `:0 executes the gerund in series from left
> to
> > >>> right.
> > >>>
> > >>> The execution order isn't specified in the docs (as far as I can
> tell),
> > >> so
> > >>> I wonder if it's an implementation detail subject to change, or if I
> > can
> > >>> rely on this?
> > >>>
> > >>> Almost all of the cases where I want '..' as a statement handler have
> > >>> to do with executing small imperative niladic instructions in
> sequence,
> > >>> and it seems like `:0'' handles that perfectly:
> > >>>
> > >>> NB. after loading tangentstorm/j-kvm/vt:
> > >>> (bg@16b111122)`(fg@_15)`cscr`(goxy@5 5)`(puts@
> ('hello',CRLF))`:0''
> > >>>
> > >>> (set the colors, clear the screen, go to position 5,5 and emit
> > 'hello'...
> > >>> in that order!)
> > >>>
> > >>> So... Can I count on this execution order?
> > >>>
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