fixed, thanks.
Henry Rich
On 7/4/2022 12:06 PM, tu...@posteo.de wrote:
Hi Raul,
great information!
Very much appreciated!
By the way:
I think, the "J"-part of
"Comparison of programming languages" in the
wikipedia is partly wrong.
Link
https://en.wikipedia.org/wiki/Comparison_of_programming_languages
It implies, that non of these attributes can be applied to J:
Imperative,object oriented,functional, procedural, generic, reflective,
eventdriven
By reading through https://www.learningj.com I got the impression,
that some of the above attributes fit...but I am bloody newbie...
Additon: All attributes has been assigned to APL...
Cheers!
Meino
On 07/04 11:42, Raul Miller wrote:
I would add:
Programming languages in general experience some language drift
because of changes to the underlying available hardware. This requires
changes to all parts of the supporting software systems. Considerable
effort is invested in retaining backwards compatibility, but it's not
perfect.
J also has been extended at various times. As a general rule, most of
these changes attempt to retain backwards compatibility (ideally with
radically improved performance). The most frequent exception to this
rule takes what was previously an error case and replaces it with
something else.
In a few examples, implementers decided that that approach would
require too much work. Perhaps the most notable of these was that
initially implicit arguments to J's verbs used the names x. and y. but
this had an unfortunate interaction with J's locale reference syntax
and the names x. and y. were dropped and replaced with x and y (with
no trailing dot).
Anyways, generally speaking, these sorts of changes tend to be
accompanied with documentation on how to cope with them for existing
code bases. And, it's usually pretty easy to learn about the
alternatives. That said, we still have some work to do...
I hope this helps,
--
Raul
On Mon, Jul 4, 2022 at 9:14 AM Jan-Pieter Jacobs
<janpieter.jac...@gmail.com> wrote:
Hi Meino,
I wouldn't worry too much about changing syntax; most of it remained the
same, except for cosmetic changes (e.g. not using x. and y. for arguments
names but x, y) and behind-the-scenes implementation aspects (faster, more
special code, in-place operations). Those generally don't change much when
programming.
I liked Learning J a lot as well when learning, as well as JforC. I would
just use those, and try out what you read, and check the release notes when
things would not work out as expected, where non-backward compatible
changes are flagged as incompatible changes.
NuVoc is the de-facto documentation that should be up to date with the
current implementation.
That said, although recently a lot has been happening for J, in my opinion,
most of the (reasonably recent) material remains valid.
Good luck,
Jan-Pieter
On Mon, 4 Jul 2022, 14:45 , <tu...@posteo.de> wrote:
Hi,
on the internet (some reddit post it was I think) I found a very nice
looking "Reference Card For J", which refers to J 602.
There are some other tutorials, books and such, which are based on previous
versions of J.
At the current point of my knowledge about J (read: bloody newbie) I
cannot estimate, whether it makes sense to learn from such sources or
not - I want to avoid to "unlearn" things later.
Especially this
https://www.learningj.com/book.htm#toc
book I like very muchm since it shows things the way I normally like to
learn new things.
Question extracted from all these lengthy words is:
What way of evolving J does ? Adding more things and keeping
everything backward compatible (so I need only to add new things later)
or "super high dynamic" :) which means: Every day the syntax is totally
changed and verbs older than a month will be thrown out and replaced by
totally diffent verbs...and I have to unlearn everything in a 14 day
cycle... :) ;) 8)
(I exaggerate here just for fun! )
Cheers!
Meino
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