Re: [Factor-talk] teaching
I used Factor at Heilbronn University, Germany: http://denkspuren.blogspot.de/2010/01/factor-heilbronn-university.html Recently, I switched to Consize, a tiny concatenative language I created for teaching purposes, see https://code.google.com/p/consize/ (browse Sources; documentation is in German). Dominikus 2013/4/9 Leonard P leonard14...@gmail.com Stacks, objects, collections, continuations, higher-order functions ... Anyone else think that Factor would make an ideal language for teaching CS? -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] teaching
that's intriguing, i didn't know about that :) it would've been nice to have a anonymous feedback/evaluation by the students of the course. i would've expected them to be at least a little offended by using a stacky language :) it's nice to read how positive your impression was though! :) On Wed, Apr 10, 2013 at 11:50 AM, Dominikus Herzberg dominikus.herzb...@gmail.com wrote: I used Factor at Heilbronn University, Germany: http://denkspuren.blogspot.de/2010/01/factor-heilbronn-university.html Recently, I switched to Consize, a tiny concatenative language I created for teaching purposes, see https://code.google.com/p/consize/ (browse Sources; documentation is in German). Dominikus 2013/4/9 Leonard P leonard14...@gmail.com Stacks, objects, collections, continuations, higher-order functions ... Anyone else think that Factor would make an ideal language for teaching CS? -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] teaching
dunnoh, trying to switch to factor as a language in a curriculum would imply reordering the courses. for university i'd say it's possible but not easily so because you'd need to change the sequence in which things are taught imho - so you have a gentle introduction (explain everything you'd need to learn in theoretical informatics first before going dipping into practical informatics since you can't really go concurrently). i would say though that the migration cost would be too high (too much trouble for not much gain) - i wouldn't be able to say what advantage there would be compared to using python/haskell/scheme/... besides that i like the syntax alot more. for school i'd say it might lack some tools so you can just throw kids at computers and hope that some grok it. On Tue, Apr 9, 2013 at 1:12 AM, Leonard P leonard14...@gmail.com wrote: Stacks, objects, collections, continuations, higher-order functions ... Anyone else think that Factor would make an ideal language for teaching CS? -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] teaching
I know that learning Forth, and Learning Forth by Leo Brodie, was the most important part of my self education in the 80s. And Factor has made me think more clearly, even as I program in C# for my day job, and javascript for my node projects. On Tue, Apr 9, 2013 at 7:39 AM, Alexander Mueller ddo...@gmail.com wrote: dunnoh, trying to switch to factor as a language in a curriculum would imply reordering the courses. for university i'd say it's possible but not easily so because you'd need to change the sequence in which things are taught imho - so you have a gentle introduction (explain everything you'd need to learn in theoretical informatics first before going dipping into practical informatics since you can't really go concurrently). i would say though that the migration cost would be too high (too much trouble for not much gain) - i wouldn't be able to say what advantage there would be compared to using python/haskell/scheme/... besides that i like the syntax alot more. for school i'd say it might lack some tools so you can just throw kids at computers and hope that some grok it. On Tue, Apr 9, 2013 at 1:12 AM, Leonard P leonard14...@gmail.com wrote: Stacks, objects, collections, continuations, higher-order functions ... Anyone else think that Factor would make an ideal language for teaching CS? -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk -- Precog is a next-generation analytics platform capable of advanced analytics on semi-structured data. The platform includes APIs for building apps and a phenomenal toolset for data science. Developers can use our toolset for easy data analysis visualization. Get a free account! http://www2.precog.com/precogplatform/slashdotnewsletter___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] Teaching myself Factor - code review, please?
You could use `each-morsel` from the io module to implement the input loop, which would be a bit cleaner. Try laying your code out something like this: : each-window ( quot: ( index packet -- ) -- ) [ WINDOW read ] each-morsel ; inline : main ( -- ) binary decode-input binary encode-output [ format-packet write ] each-window eot-packet write ; -Joe -- Try before you buy = See our experts in action! The most comprehensive online learning library for Microsoft developers is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3, Metro Style Apps, more. Free future releases when you subscribe now! http://p.sf.net/sfu/learndevnow-dev2 ___ Factor-talk mailing list Factor-talk@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/factor-talk
Re: [Factor-talk] Teaching myself Factor - code review, please?
It all depends on what you want to do:
As Joe suggested, handling packets one at a time with a combinator is
better than reading the whole stream and then writing the whole
result. Your each-window combinator should implement the increasing
index logix. However this won't work if you want to implement the
optionnal shuffle feature (maybe that's why you were reading the whole
input before proceeding).
However, if you do want to read the whole input, here's a more
idiomatic way of writing read-chunks (didn't test, but should work):
USING: grouping
: read-chunks ( -- seq ) contents WINDOW group ;
Even with the old structure of a loop with reads, you could make it
clearer by using generalized booleans (pretty name to say that
everything except f is true)
: read-chunks ( -- seq ) [ [ WINDOW read dup [ , t ] [ ] if ] loop ] { } make
! or this
: read-chunks ( -- seq ) [ [ WINDOW read [ , t ] [ f ] if* ] loop ] { } make
! There was also a solution with the word produce
: read-chunks ( -- seq ) [ WINDOW read dup ] [ ] produce nip ;
Also, the docs recommend to use
http://docs.factorcode.org/content/word-read-partial,io.html in your
case.
Finally, as a general rule, I prefer shorter functions without
comments to long function with comments. So you could break down
format-packets in smaller words. Keep in mind that this is easy in
concatenative languages. The comment of format-packet even shows that
you think of this words as 2 operations (Do A. Also do B), so I
would define A and B and define format-packets as A B without
comments.
Overall it was already pretty readable though..
Hope this helps.
Cheers,
Jon
On Mon, Feb 20, 2012 at 1:59 PM, Tim Allen screwt...@froup.com wrote:
(this is a resend of a message that got caught in the moderation queue)
I have a friend who occasionally runs programming competitions for kids,
and when he's putting together exercises he sometimes runs them by us
just to see what we'll come up with. The other day he posted
a description of a simple task and I thought I'd have a go. I got it
working in Python very neatly, but then I decided I'd see if I could
figure out how to do the same in Factor.
Here's the problem description:
Code Golf Challenge #1
==
Write something that will:
* Encode stdin into chunks like so:
01 1 octet SOH
2 octets chunk number (monotonically increasing)
xx 1 octet chunk length
... 256 octets up to 255 bytes of data
xx 1 octet checksum (8-bit sum of all data bytes)
with an end of transmission marker of:
04 1 octet EOT
2 octets chunk number
00 1 octet length 0
* optionally shuffle chunks
* base64-encode output
Your entry should be *readable*. Use any standard libraries you want.
Par 78 SLOC (ANSI C). It relies on standard Unix tools and pipes.
For what it's worth, I'm told this algorithm is very similar to the
ancient XMODEM file-transfer protocol. Yes, 'readable' conflicts with
'code golf'; at least for the Factor version I'm trying to prefer
readability over brevity. Also, comparing my implementation to the
sample ANSI C implementation, it turns out there are extra rules:
- chunk length is actually capped at 128 bytes
- the uint16 chunk length should be stored in big-endian order
Here's my Factor implementation. It works (that is, it produces
identical output to the reference implementation), but it's not very
pretty (note that I've ignored the 'shuffle' feature, and base64
encoding is done with an external tool, same as the reference
implementation):
USING: arrays io io.encodings io.encodings.binary kernel locals
make math pack sequences syntax ;
IN: bmodem
CONSTANT: WINDOW 128
! Splits stdin into an array of WINDOW-sized byte-arrays.
: read-chunks ( -- seq )
[ [ WINDOW read dup f = [ ] [ , t ] if ] loop ] { } make
;
! Takes a sequence of payload byte-arrays and frames each one
! with a packet-header and check-sum.
! Also adds the trailer (EOT) packet.
: format-packets ( seq -- seq' )
[
[
[| payload index |
1 index payload length 3array CSC pack-be %
payload %
payload sum 256 mod ,
] B{ } make
] map-index
]
[ length 4 swap 0 3array CSC pack-be ] bi
suffix
;
! Slurp bytes from stdin, spit packets to stdout.
: main ( -- )
binary decode-input read-chunks
binary encode-output format-packets [ write ] each
;
MAIN: main
In particular, the way read-chunks breaks out of the loop when it's hit
EOF strikes me as ugly, what with the if word's quotations having
different stack signatures. Also, there's still a few stack-shuffling
words lurking about
