Google+ forum
BTW, Google+ is disappearing soon[1], which is yet another reason to
encourage people to -- rather than fragment our small community amongst
every upstart you're-the-product social media play -- instead use the
official `racket-users` forum (available as both email list and Web
Thanks Jon.
yes. I did, and you are right. I posted the same question a Google+ forum
(https://plus.google.com/108613325307702875646/posts/1BaDJFoat4D), and I
also got a reply that:
"John is being parsed as a variable, and thus, its binding is looked up in
the local environment. Of course, ther
On Sun, Jan 13, 2019 at 12:37 AM Hassan Shahin wrote:
> Thanks Jack and Mike!
>
> You are right. Arguments to procedures will be evaluated before the
> invocation of the procedure.
>
This is true, but it's not really the issue in your case. Even in #lang
lazy, which does not eagerly evaluate pro
Thanks Jack and Mike!
You are right. Arguments to procedures will be evaluated before the
invocation of the procedure. I thought that because (if) is not an ordinary
procedure, and because one can express if in terms of cond (or vice versa)
that my procedure is also a non ordinary procedure, wh
On Sat, 12 Jan 2019 at 21:12 -0800, Hassan Shahin wrote:
> When I apply the procedure to 'John it will evaluate to 'symbol. The idea
> of the procedure is to check the "type" of the given item, which is not
> decided aprior. If I give it 'John I know it is a symbol.
> May be my question should be
Thanks Mike.
When I apply the procedure to 'John it will evaluate to 'symbol. The idea
of the procedure is to check the "type" of the given item, which is not
decided aprior. If I give it 'John I know it is a symbol.
May be my question should be formulated as this: Since John is not a pair,
an
You need to apply the function to 'John, with a single quote in front of
it. The word John without that quote is just a variable reference to
something that you have not actually defined.
On Sat, Jan 12, 2019 at 11:34 PM Hassan Shahin wrote:
> I have this definition for a procedure:
>
> (define
I have this definition for a procedure:
(define type-of (lambda (item)
(cond
[(pair? item) 'pair]
[(null? item) 'empty-list]
[(number? item) 'number]
[(symbol? item)
Hi Matthew et al.,
Following up some work from last fall:
On Oct 6, 2018, at 15:58, Matthew Flatt wrote:
> At Wed, 26 Sep 2018 15:57:12 -0700, Jordan Johnson wrote:
>>> (require racket/sandbox)
>>> (make-evaluator "beginner-lang.rkt")
>> . . ../../../../../../../../Applications/Racket
>> v7.0/c
FIGLIO DI PUTTANA ANGELO LIETTI DI MEDIOLANUM, NDRANGOLANUM, MAFIOLANUM,
HITLERANUM! TENEVA I RAPPORTI CON GLI IMPRENDITORI ASSASSINI DI COSA
NOSTRA: FRANCESCO ZUMMO E IGNAZIO ZUMMO! AI TEMPI DELL'ARRESTO
DELL'AVVOCATO PEDOFILO E NAZI: PAOLO SCIUME'! VERME SCHIFOSISSIMO ANGELO
LIETTI: BANCHIERE
On Sat, Jan 12, 2019 at 06:44:26PM +0100, Tomasz Rola wrote:
> On Sat, Jan 12, 2019 at 11:10:27AM +0100, 'Paulo Matos' via Racket Users
> wrote:
> >
> >
> > On 11/01/2019 17:23, Greg Trzeciak wrote:
> > > What would be really neat if https://pkgs.racket-lang.org/ would include
> > > date-added t
Thanks Ben. Good to know. Hey Robbie, it's been a while. Hope everything is
going well. Great book. :)
-mike
On Jan 12, 2019 12:04, "Robby Findler" wrote:
Hi Mike! Thanks for pointing this out. I've updated the errata
(Thanks, Ben for those links; I was having trouble finding the date of
the ch
On Sat, Jan 12, 2019 at 11:10:27AM +0100, 'Paulo Matos' via Racket Users wrote:
>
>
> On 11/01/2019 17:23, Greg Trzeciak wrote:
> > What would be really neat if https://pkgs.racket-lang.org/ would include
> > date-added to all the packages. This way one could create automatic list
> > of newly ad
Hi Mike! Thanks for pointing this out. I've updated the errata
(Thanks, Ben for those links; I was having trouble finding the date of
the change.)
Robby
On Sat, Jan 12, 2019 at 4:41 AM Mike MacHenry wrote:
>
> Hey everyone,
>
> I'm having an issue with one of the examples from Semantics Engineer
You discovered a backwards incompatible change to Redex. Changing M
and N to A and B is a good fix. (The errata really should talk about
this.)
Here are two related threads:
https://groups.google.com/d/msg/racket-users/be54SG881GU/bndA4eiGAQAJ
https://groups.google.com/d/msg/racket-users/NMuBaVlcD
Hi
Can can anyone point me to any package or other Racket code that uses the
Racket OpenCV package ?
https://github.com/oetr/racket-opencv
Kind regards,
Stephen
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On Sat, Jan 12, 2019 at 10:55 AM Zhonghua Zhu
wrote:
> I am writing a tcp server program.
> Server uses non-blocking reading and client uses write-bytes, then server
> never read any bytes and write-bytes returns the right value.
> But when I change client's write-bytes
I am writing a tcp server program.
Server uses non-blocking reading and client uses write-bytes, then server
never read any bytes and write-bytes returns the right value.
But when I change client's write-bytes to write-bytes-avail, server
receives bytes immediately.
I don't know why this happens
I don't think I mentioned newsletter before but I did raise the issue of
missing date-added in packages before - my expertise is in data
usefulness/usability so it really hurts my feelings ;)
I agree about hidden gems I stumble upon by pure chance.
>From time to time I try to search pkgs site f
Hey everyone,
I'm having an issue with one of the examples from Semantics Engineering
With PLT Redex. Specifically in 12.3 on page 225, the definition for the
iswim-standard reduction relation. As printed in the book, I get the error
"reduction-relation: shortcut name may not be a non-terminal
On 11/01/2019 17:23, Greg Trzeciak wrote:
> What would be really neat if https://pkgs.racket-lang.org/ would include
> date-added to all the packages. This way one could create automatic list
> of newly added packages and let's say distribute it in the newsletter
Which newsletter are you referr
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