Re: [racket-users] Structured Concurrency in Racket

I think the ceu language has a nice model of what I would consider "structured". http://ceu-lang.org/ It has automatic cancellation and finalization. Racket can easily support this model. Await statements are captured through delimited continuations and processes are managed in a tree. If a parent

[racket-users] DrRacket back button

In DrRacket I like being able to right click on an identifier and `Jump to Binding Occurance". Is there a way to "jump back" to where you jumped from? -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiv

Re: [racket-users] catch and bind an unbound id in a macro

`identifier-binding` might be useful if a binding can be defined outside of set/define https://docs.racket-lang.org/reference/stxcmp.html?q=identifier-binding#%28def._%28%28quote._~23~25kernel%29._identifier-binding%29%29 On Fri, Apr 19, 2019 at 4:55 PM Matthias Felleisen wrote: > > I had the i

[racket-users] Re: syntax rewriting bindings

I think I figured it out in case others are interested. See https://gist.github.com/wluker/329f85ec193b386d89f618bd02796611 On Thu, Jan 31, 2019 at 4:50 PM Luke Whittlesey wrote: > I see that there is the local-expand/capture-lifts and > syntax-local-lift-expression for expressions,

[racket-users] syntax rewriting bindings

I see that there is the local-expand/capture-lifts and syntax-local-lift-expression for expressions, but is there a way to lift bindings as well? ... something akin to local-expand/capture-lift-defines maybe ... Basically I want to rewrite a syntax so any (MyDefine ...) is lifted into a definition

Re: [racket-users] updated Racket-on-Chez status

This is really impressive work! On Tue, Jan 29, 2019 at 9:49 AM Matthew Flatt wrote: > Here's a new status report on Racket CS: > > http://blog.racket-lang.org/2019/01/racket-on-chez-status.html > > Short version: Racket CS is done in a useful sense, but we'll wait > until it gets better before

Re: [racket-users] Web server hits "Sorry, this page has expired. Please go back."

Interesting conversation.. I want to add that #lang web-server does have file-boxes ( https://docs.racket-lang.org/web-server/stateless.html?q=web-server#%28part._lang%2Ffile-box%29) for when one might want to preserve data like you would in the store. To run across multiple machines I would imagin

Re: [racket-users] question on quasisyntax/loc

x stx (syntax-e stx) src-stx stx)) > > Then you could write (replace-outer-srcloc here y) to get the behavior > you want. > > Alexis > > > On May 8, 2018, at 09:56, Luke Whittlesey > > wrote: > > > > I'm having trouble understanding quasisyntax/loc in

[racket-users] question on quasisyntax/loc

example an incorrect use of quasisyntax/loc? What am I missing? Thanks, Luke -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users

Re: [racket-users] Re: Logging and stdout in web-server

That worked just fine, thanks Jay! Luke -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For more opti

[racket-users] Re: Logging and stdout in web-server

Does anyone have any tips on how to turn on transparent request logging from this question above? 2) How do I insert the transparent request logger in my dispatch-rules so that request info will be shown on stdout? Thanks! Luke -- You received this message because you are subscribed to the

[racket-users] Re: Logging and stdout in web-server

Well, that was ridiculously easy. Thanks! Luke -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. For mo

[racket-users] Re: Logging and stdout in web-server

For clarity, that line where I call: (make '() req) Is the one that's failing because '() is clearly not a "connection". Thanks! Luke On Fri, Nov 11, 2016 at 2:18 PM, Luke Bayes wrote: > Disclaimer: I'm a long-time software engineer, but very new to Lisp/

[racket-users] Logging and stdout in web-server

racket src/authentication-main.rkt My concrete questions are: 1) How do I get my servlet code to print to stdout? 2) How do I insert the transparent request logger in my dispatch-rules so that request info will be shown on stdout? 3) How should I connect topic-based loggers in my servlet modul

Re: [racket-users] POST requests never bound?

I'd be happy to do do it. I've spent a little time digging around for the appropriate place, but nothing seems obvious. Would you (or someone else?) mind giving me a pointer to help me see where such an update most likely belongs? -- You received this message because you are subscribed to the

[racket-users] Re: POST requests never bound?

And minutes after posting the question, the solution emerges. Answer here for any other scheme illiterates that stumble over this. [("sign-in") #:method "post" sign-in-post] Thank you Rubber Ducky! Luke -- You received this message because you are subscribed

[racket-users] Re: POST requests never bound?

On Monday, November 7, 2016 at 11:15:59 PM UTC-8, Luke wrote: > I'm sure I've missed something incredibly simple here, but I can't seem to > get a POST handler to work at all. > &g

[racket-users] POST requests never bound?

-in") (#:method "post") sign-in-post] ``` But that throws an `unexpected term` error for the `dispatch-rules` call. With the above configuration, I can load the form at /sign-in, but when I click, I get the Racket webserver 404 message. As I said, I'm sure this is somethin

Re: [racket-users] Re: my best idea ever: become a sponsor of RacketCon 2016

On Sunday, April 17, 2016 at 12:41:57 PM UTC-4, Matthew Butterick wrote: > >> I don't want to be hit with a ray-of-shame...gentle or otherwise. > >> > >> Please clarify? > > > > Probably came across as grumpy, but wasn't...do you instead mean that IF > > you are making money with Racket, you sho

[racket-users] Re: my best idea ever: become a sponsor of RacketCon 2016

On Sunday, April 17, 2016 at 7:42:36 AM UTC-4, Luke Stark wrote: > On Tuesday, April 12, 2016 at 11:28:42 PM UTC-4, Matthew Butterick wrote: > > > I want to emit a special gamma ray of gentle shame to those Racketeers who > > use Racket professionally, i.e. make money from i

[racket-users] Re: my best idea ever: become a sponsor of RacketCon 2016

On Tuesday, April 12, 2016 at 11:28:42 PM UTC-4, Matthew Butterick wrote: > I want to emit a special gamma ray of gentle shame to those Racketeers who > use Racket professionally, i.e. make money from it. This is a somewhat confusing message. I'm trying to figure out a way to work Racket into

Re: [racket-users] Re: Fast way to map over a list many times, changing ONE element each time?

My 1000 numbers were so small that they weren't reliable. Change the `num-runs-per-f` and experiment yourself, if you'd like. The code is attached. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receivin

[racket-users] Re: Fast way to map over a list many times, changing ONE element each time?

I timed all these with `sqr` on a list of 1 `(random)`. Luke's (my) first one: cpu time: 4706 real time: 4699 gc time: 3673 Luke's second one: cpu time: 5401 real time: 5393 gc time: 4136 Jon's first one: cpu time: 9734 real time: 9728 gc time: 8007 Jon's second one (tested on a vector of c

[racket-users] Fast way to map over a list many times, changing ONE element each time?

Say I have a list ls and I want to produce a list of lists where the i'th list has the i'th element of ls tripled, but all other elements are the same. e.g. '(3 5 7) => '((9 5 7) (3 15 7) (3 5 21)) What is a fast way to do this? I could do a loop with appending. (define (map-once f ls) (let M

[racket-users] Re: OK to post Redex and HtDP questions here?

I don't post here a whole lot, but >From the description of this mailing list: "This is the right place for discussion of nearly all Racket issues." So I'd say yeah. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group

[racket-users] strange bug with racket/gui

couldn't find a direct way to get `dc` and `canvas`, and I didn't want to put my entire code in the function that paint-callback calls. Is there a more straightforward way to get these values? Thanks! -Luke -- You received this message because you are subscribed to the Google Groups &qu

[racket-users] Re: Get list of all predefined identifiers for use in vim syntax highlighting

To provide some closure: -The generator provided by Jens completely worked. I set up vim to have one color & indentation for keywords, and another color & indentation for builtins. -The ambiguity brought up by Greg has shown not to be a problem. I only touched racket/base, as I nearly exclusiv

Re: [racket-users] Get list of all predefined identifiers for use in vim syntax highlighting

Thank you very much, Jens. This appears to be all the functions. Do you know of anything for special forms? This would include for, for/and, define-values, etc... On Monday, June 1, 2015 at 11:09:31 AM UTC-4, Jens Axel Søgaard wrote: > Hi Luke, > > > This script generates a l

[racket-users] Get list of all predefined identifiers for use in vim syntax highlighting

For those who like to write their racket code in vim, the plugin https://github.com/wlangstroth/vim-racket is pretty essential. Unfortunately, it is outdated and many of the new predefined identifiers (e.g. set-add!) are not highlighted. I added a few of these in my personal settings, but it wo

Re: [racket-users] Simple Interdependent Units?

Would lazy-require work here? http://docs.racket-lang.org/reference/lazy-require.html On Mon, May 25, 2015 at 3:56 PM, Matthias Felleisen wrote: > > On May 25, 2015, at 3:19 PM, Michael Tiedtke > wrote: > > > See, you're doing away with the class definitions and substitute them > with unit def

Re: [racket] typed/racket, promises, and type dispatch

that held a struct that held a promise? > That way you can force the outer promise and then look at the struct to > see whether it’s a wire or a wire-vec, without forcing the inner promise? > > On Jan 24, 2015, at 5:59 PM, Luke Whittlesey > wrote: > > That's a nice idea, I l

Re: [racket] typed/racket, promises, and type dispatch

see a way to do this, so I might alter my approach. Maybe use Racket to generate a netlist/graph from the same letrec forms, but without a type checker in the way, and then figure out a way to type check the graph as a second step. Thanks for your help. -Luke On Sat, Jan 24, 2015 at 12:50 AM, Al

Re: [racket] typed/racket, promises, and type dispatch

of wires, but the input could also be a promise that forces to either a wire or a bundle. Ususally when I get myself into a corner and there's not an easy way out, I need to rethink my approach (or goals). Thanks for your suggestions. -Luke Racket Users list: http://lists.racket-lang.org/users

Re: [racket] typed/racket, promises, and type dispatch

hy I thought that was the case. Thanks for setting me straight. -Luke On Thu, Jan 22, 2015 at 8:26 PM, Matthias Felleisen wrote: > > > TR is a library-language of R with types and type checking hooked in after > macro-expansion is done (the part of the compiler that is relevant). Whe

[racket] typed/racket, promises, and type dispatch

t's payload without forcing it, but it seems like the (Promise Wire) type is available at compile time, so there might be a way to make a compile time dispatch. Thanks, Luke Racket Users list: http://lists.racket-lang.org/users

Re: [racket] errortrace breaks local-require on submodules

My racketfoo is not strong enough to provide a suggestion for a solution, but I can see the utility in what you are trying to do (at least in the way I understood your message); use a macro to wrap untyped code within a typed context. TR provides a `with-type` to write typed code within an untyped

Re: [racket] lazy letrec-values

ted if I run it within drracket. Thank you all for your time and help. (And thank you for creating such a nice community and toolset!) -Luke On Fri, Jul 11, 2014 at 12:02 AM, Spencer Florence < flore...@northwestern.edu> wrote: > It looks like he has taken those down. But I

Re: [racket] lazy letrec-values

currently not the case. Beyond the library documentation, does anyone know if there are any discussions or tutorials that go into the do's and don'ts of using #lang lazy ? Thanks, Luke On Thu, Jul 10, 2014 at 6:24 AM, Matthew Flatt wrote: > I'm not sure whether to call it a bug

[racket] lazy letrec-values

te circular lists, but why doesn't this work? Am I misunderstanding something or is this a bug? Thanks, Luke Racket Users list: http://lists.racket-lang.org/users

Re: [racket] Math library kudos

1 AM, Neil Toronto wrote: > You're welcome! > > A user not finding a documented function is excellent feedback. It means > we need to communicate better. Do you remember how you searched for a > combinations function? > > Neil ⊥ > > > On 02/20/2013 08:45 AM, Luke Vi

Re: [racket] Math library kudos

Ha! Sorry for not reading the documentation more thoroughly - I hope this was at least a bit educational to someone besides me :) Fantastic library and docs, by the way. On Wed, Feb 20, 2013 at 10:38 AM, Neil Toronto wrote: > On 02/20/2013 06:42 AM, Luke Vilnis wrote: > >> No p

Re: [racket] Math library kudos

and 2, but this usually is not a problem. PS. It looks like Racket's math collection has a built-in log-factorial function too, to avoid all the +1's, so you could try that. On Wed, Feb 20, 2013 at 1:44 AM, Joe Gilray wrote: > Hi Luke, > > Thanks for the knowledge. Do you h

Re: [racket] Math library kudos

FYI, log gamma is another fast way to calculate the number of combinations if you want to deal with really big numbers. On Tue, Feb 19, 2013 at 7:28 PM, Joe Gilray wrote: > Racketeers, > > Thanks for putting together the fantastic math library. It will be a > wonderful resource. Here are some

Re: [racket] Racket Social/Support Groups in London

Am I the only one who read "support group" and thought... "Hi... my name is and I'm a Rackaholic." "Sometimes when I'm supposed to program, I meta-program instead..." "After using TR's real union types and occurrence typing, I can't even look my data-constructors in the eye anymore!" "I add p

Re: [racket] Reading bibtex files

If I delete all the newlines and spaces (aside from spaces around "=" signs) it works... Maybe there's some feature to ignore whitespace? On Mon, May 21, 2012 at 10:36 AM, Laurent wrote: > (replying to list) > > Thanks, that was a good idea, but conversion to unix format (I'm on linux) > did not

Re: [racket] RacketCon 2012?

+1 It was really a wonderful opportunity last year. On Tue, May 15, 2012 at 2:12 PM, Scott Hickey wrote: > Are there any plans for a RacketCon 2012? > > Scott Hickey > > > Racket Users list: > http://lists.racket-lang.org/users > > Racket Users list:

Re: [racket] `def' ?

Correction - should have been "...Clojure, Scala, Groovy, _Python_, Ruby..." On Fri, May 11, 2012 at 4:49 PM, Luke Vilnis wrote: > Asserting that the keyword "def" would confuse beginners is a red herring. > Scheme is AFAIK the only language whose variable binding fo

Re: [racket] `def' ?

Asserting that the keyword "def" would confuse beginners is a red herring. Scheme is AFAIK the only language whose variable binding form is _not_ some kind of an abbreviation. C#/JavaScript use "var". Heck, D and C++11 use "auto", which is truly bizzare. "def" is a very common keyword to use for th

Re: [racket] Custom Key Bindings - Post Your File

I assume Chaitin's constant is involved. On Fri, May 11, 2012 at 3:22 PM, Matthias Felleisen wrote: > > [How] does Xcode allow you to enter arbitrary computations in response to > key events? I don't understand how one can list "all possible actions" > since there are infinitely many? -- Matthias

Re: [racket] `def' ?

at word frequency has more impact on reading time than word length. > > > On Thu, May 10, 2012 at 3:39 PM, Luke Vilnis wrote: > >> I can only speak for myself but I think it's a bit much to assert that >> word length has nothing to do with readability. Heck, maybe tha

Re: [racket] `def' ?

I can only speak for myself but I think it's a bit much to assert that word length has nothing to do with readability. Heck, maybe that's even true for you, but not for everyone. I have certainly felt it to be an issue. If the "define" keyword was 50 letters long it would definitely have an impact

Re: [racket] `def' ?

Unfortunately I don't think you can combine def with destructuring, because then you can't use it for functions afaik. I think two forms is necessary. On Thu, May 10, 2012 at 1:20 PM, Greg Hendershott wrote: > To combine what Neil and Luke said, maybe one new thing `def' cou

Re: [racket] `def' ?

+1000 to "def" idea I think the super verbose keywords can be an impediment to code readability. The increase in signal-to-noise, along with (imo) sexier looking code samples to show to prospective Racketeers is worth it. As silly as it might sound, when I started out, Scheme's notoriously long ke

Re: [racket] [Typed Racket] mapping car

I had to instantiate the "map" function explicitly, and couldn't use "cons?" because it returns whether something is a Pair, not a Listof - but the following works: (: cars : (All (A) (Listof (Listof A)) -> (Listof A))) (define (cars ls) ((inst map A (Listof A)) car (filter (λ (x) (not (empty? x)

Re: [racket] sad user face?

To weigh in on this - when I was an undergrad, women routinely called themselves "freshmen." Best, Luke On Sat, Feb 18, 2012 at 8:13 PM, Matt Jadud wrote: > On Sat, Feb 18, 2012 at 19:59, Joe Gilray wrote: > > No doubt about it! And the little icon-guy in the upper

Re: [racket] Disable/Enable Tests

I've also been wondering about this. It doesn't seem to do anything if I use the standard (check-expect) and (run-tests) forms. On Sun, Nov 27, 2011 at 8:17 PM, Mark Engelberg wrote: > In the latest version of Racket, I see a menu item to disable and > enable tests. What testing library does thi

[racket] Ceylon language borrows Typed Racket features?

Has anyone taken a look at the upcoming language Ceylon? It feels to me like a pretty aggressively blub-y Java clone, but it has two features that seem like they're ripped straight out of Typed Racket. It looks like the language includes a basi

Re: [racket] Getting test-engine to work with #lang racket

wrote: > > On Sep 18, 2011, at 9:22 PM, Luke Vilnis wrote: > > Thanks guys, that works! Still, it's pretty confusing that running (test)from > the repl does not work, only inserting it at the end of the file. It > would be nice to mention that in the docs, something like: &

Re: [racket] Getting test-engine to work with #lang racket

Tests option in the Racket menu do? It doesn't appear to affect the automatic test-running of "Beginning Student" either. It could be a bug, but I'd be willing to bet that I'm missing something else basic here as well. On Sun, Sep 18, 2011 at 8:30 PM, Stephen Bloch wrote:

[racket] Getting test-engine to work with #lang racket

variable in their module definition, but I have no idea what that would mean for getting it to work in regular old racket. Thanks, Luke _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users

Re: [racket] HTDP2e typo?

#f and false both work, maybe someone else can comment about if there are limitations related to which language (Beginner, Advanced, full Racket...) is declared in DrRacket. On Wed, Jan 5, 2011 at 10:34, Arthur Nunes-Harwitt wrote: > Hi, > > I apologize if this is not quite the right mailing li

Re: [racket] Am I Missing Something? [HtDP 31.3.1]

true. On Tue, Jan 4, 2011 at 08:10, Carl Eastlund wrote: > Luke, > > In the future, please do not post complete (or nearly complete) > homework solutions to the list. Try to find a slightly more indirect > way to ask your question -- we're happy to answer, we just don'

[racket] Am I Missing Something? [HtDP 31.3.1]

When I run the plain recursive vs. the accumulator version of sum with g-series, I get the same result, which the text says isn't supposed to happen. Code attached. What am I missing? Luke 31.3.1.rkt Description: Binary data _ For list-re

Re: [racket] Defining Variables in a function

point and trust that in time all will be revealed. Luke On Sat, Jan 1, 2011 at 08:03, Sayth Renshaw wrote: > Working through HTDP and I got to this example(below) I created a working > function but I reused a function, is there a better way to assign a variable > in another function so, f

Re: [racket] Rookie Question on Functional Languages

h doesn't make sense. (define (do-times n expr) (cond [(< n 1) evaluate-expr-last-time] [else ?? evaluate-expr (do-times (sub1 n) expr)])) On Thu, Dec 9, 2010 at 13:08, Ryan Culpepper wrote: > On 12/09/2010 11:51 AM, Luke Jordan wrote: > >> Here's a rookie question t

[racket] Rookie Question on Functional Languages

f a better way. Am I missing a piece? Does it only seem tricky because Racket is my first functional language. aTdHvAaNnKcSe ^ actually unnecessarily tricky Luke _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users

[racket] Value Extraction from Lists vs. Structures

I'm reading HtDP 29.3. I get how value extraction from lists works in O(n) time, but how does extraction from structures work in O(1)? Thanks (for being the "help me with HtDP" mailing list as well as the Racket mailing list...) Luke _

Re: [racket] Exploratory programming?

Yes, using DrRacket it's really really easy to interface with help, explore libraries, etc., at least as far as I have found for my humble needs. It uses racket/doc/search/search-context.html. On Tue, Nov 30, 2010 at 10:55, Richard Lawrence < richard.lawre...@berkeley.edu> wrote: > Dear Racketee

Re: [racket] 27.1.3

>From your description you haven't done anything wrong that I can tell. But there's not enough detail there to help either. Will you post error feedback, or your code? Or if the code will give away the solution I am happy to help offline (email me direct). On Thu, Nov 11, 2010 at 12:48, Ken Hege

Re: [racket] Newbie question

Think of how, with multiplication, you could convert a sequence of digits into a whole number that you could compare to another whole number. On Nov 10, 2010 2:40 PM, "André Toscano" wrote: Hi all! I'm new to programming. I'm trying to learn on my own in my spare time, not a student in any scho

Re: [racket] Generative recursion

1 modified-input) wasn't a divisor, else (list input). It's really not a generative solution, just a confusing structural one. On Fri, Nov 5, 2010 at 06:16, Jos Koot wrote: > Luke, you'd better ignore my third approach and follow the instructions > of Todd. > My method

Re: [racket] Math Guidance

Thanks for the valuable input! I feel more sure of my footing. Onward... _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users

Re: [racket] Generative recursion

t and append are different. Trying not to say too much, but hope I'm still saying something useful. - Luke On Wed, Nov 3, 2010 at 17:43, Ken Hegeland wrote: > I am trying to do the problem 26.1.1 in the book HTDP and I just feel like > the more I think about it, the more confused I ge

[racket] Math Guidance

what math?) or just learn it as I go along based on what programming I am studying? What math do I need to get through HtDP? Thanks-- Luke _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users

[racket] Stuck on HtDP 25.2.6

ocking me from seeing how to approach this problem. Thanks-- Luke _ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users