# Latest **URL:** https://racket.discourse.group/latest.md?page=62 [Latest](https://racket.discourse.group/latest.md) · [Categories](https://racket.discourse.group/categories.md) · [Tags](https://racket.discourse.group/tags.md) **Page:** 63 --- ## [Passing procedures of unknow arity across typed/untyped boundary](https://racket.discourse.group/t/passing-procedures-of-unknow-arity-across-typed-untyped-boundary/831)
**Author:** [@scolobb](https://racket.discourse.group/u/scolobb)\ **Replies:** 9\ **Last updated:** [April 2, 2022, 9:41am UTC](https://racket.discourse.group/t/passing-procedures-of-unknow-arity-across-typed-untyped-boundary/831 "2022-04-02T09:41:21Z")
Hello, I need to pass a function of unknown arity to another function in Typed Racket, in particular because the approach using polymorphic functions from this thread does not completely fit my use case, and also becaus… --- ## [\#lang plai-typed not available?](https://racket.discourse.group/t/lang-plai-typed-not-available/840)
**Author:** [@AlexG](https://racket.discourse.group/u/AlexG)\ **Replies:** 2\ **Last updated:** [April 2, 2022, 1:51am UTC](https://racket.discourse.group/t/lang-plai-typed-not-available/840 "2022-04-02T01:51:37Z")
Hello, first post here: I want to work through Shriram Krishnamurthi's PLAI book, but the language specified (#lang plai-typed) does not appear to be included in my Dr.Racket 8.4 Ubuntu distribution. Is there a way to … --- ## [Resyntax: A Macro-Powered Refactoring Tool](https://racket.discourse.group/t/resyntax-a-macro-powered-refactoring-tool/835)
**Author:** [@notjack](https://racket.discourse.group/u/notjack)\ **Replies:** 2\ **Last updated:** [April 1, 2022, 7:56pm UTC](https://racket.discourse.group/t/resyntax-a-macro-powered-refactoring-tool/835 "2022-04-01T19:56:55Z")
Some of you may already know this, but I've implemented a refactoring tool for Racket called Resyntax. It analyzes your code (must be written in #lang racket/base) and suggests ways you can improve it. Here's an example … --- ## [Continuation question (from Matt Might's blogs)](https://racket.discourse.group/t/continuation-question-from-matt-mights-blogs/825)
**Author:** [@tmeehan](https://racket.discourse.group/u/tmeehan)\ **Replies:** 20\ **Last updated:** [March 31, 2022, 8:52pm UTC](https://racket.discourse.group/t/continuation-question-from-matt-mights-blogs/825 "2022-03-31T20:52:14Z")
I have been trying to figure out continuations after a recent question got me interested in them again. I stumbled back onto Matt Might's voluminous blog, and saw this entry, that had this function: (define (current-con… --- ## [Racket meet-up Saturday 2 April 18:00 UTC :racket:](https://racket.discourse.group/t/racket-meet-up-saturday-2-april-18-00-utc/789)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 1\ **Last updated:** [March 31, 2022, 4:34pm UTC](https://racket.discourse.group/t/racket-meet-up-saturday-2-april-18-00-utc/789 "2022-03-31T16:34:07Z")
Racket meet-up Saturday 2 April 18:00 UTC :racket: 2022-04-02T18:00:00Z (UTC) Online: https://gather.town/app/wH1EDG3McffLjrs0/racket-users When: First Saturday EVERY Month UTC: 18:00 Show and tell Anything else? 3… --- ## [Racket meet-up Saturday 5 March 18:00 UTC :racket:](https://racket.discourse.group/t/racket-meet-up-saturday-5-march-18-00-utc/748)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 0\ **Last updated:** [February 28, 2022, 1:06pm UTC](https://racket.discourse.group/t/racket-meet-up-saturday-5-march-18-00-utc/748 "2022-02-28T13:06:31Z")
Racket meet-up Saturday 5 March 18:00 UTC :racket: 2022-03-05T18:00:00Z (UTC) Online: https://gather.town/app/wH1EDG3McffLjrs0/racket-users When: First Saturday EVERY Month UTC: 18:00 RacketCon planning In-person mee… --- ## [Docs.racket-lang.org updated to 8.4](https://racket.discourse.group/t/docs-racket-lang-org-updated-to-8-4/722)
**Author:** [@samth](https://racket.discourse.group/u/samth)\ **Replies:** 0\ **Last updated:** [February 23, 2022, 7:24pm UTC](https://racket.discourse.group/t/docs-racket-lang-org-updated-to-8-4/722 "2022-02-23T19:24:00Z")
The online documentation at https://docs.racket-lang.org/ is now updated to version 8.4, including freshly built versions of all packages with 8.4. --- ## [Parsing X.509 certificates](https://racket.discourse.group/t/parsing-x-509-certificates/833)
**Author:** [@dominik.pantucek](https://racket.discourse.group/u/dominik.pantucek)\ **Replies:** 4\ **Last updated:** [March 29, 2022, 3:36am UTC](https://racket.discourse.group/t/parsing-x-509-certificates/833 "2022-03-29T03:36:51Z")
Long, long time ago, someone implemented a very simple batch request/response processing with signature verification, using openssl\_verify\[1\]. Yes, PHP. Now we are re-implementing the receiver part in Racket. Trouble i… --- ## [Uni-table formatting help](https://racket.discourse.group/t/uni-table-formatting-help/823)
**Author:** [@rscho](https://racket.discourse.group/u/rscho)\ **Replies:** 6\ **Last updated:** [March 28, 2022, 7:09pm UTC](https://racket.discourse.group/t/uni-table-formatting-help/823 "2022-03-28T19:09:47Z")
Hi, I am having a go at the uni-table package (hi @dominik.pantucek! :slight\_smile: ). This styling: (uni-table-\>string tbl #:table-border '(solid light) #:col-borders '((solid lef… --- ## [Need some reasons to persuade me to use racket web rather than others eg python flask](https://racket.discourse.group/t/need-some-reasons-to-persuade-me-to-use-racket-web-rather-than-others-eg-python-flask/829)
**Author:** [@Hanson](https://racket.discourse.group/u/Hanson)\ **Replies:** 3\ **Last updated:** [March 27, 2022, 7:31pm UTC](https://racket.discourse.group/t/need-some-reasons-to-persuade-me-to-use-racket-web-rather-than-others-eg-python-flask/829 "2022-03-27T19:31:44Z")
I know it's cool to use racket but is there any advantage than other web server? --- ## [How can i create function that takes an instance and updates it?](https://racket.discourse.group/t/how-can-i-create-function-that-takes-an-instance-and-updates-it/820)
**Author:** [@osman44](https://racket.discourse.group/u/osman44)\ **Replies:** 3\ **Last updated:** [March 25, 2022, 4:59pm UTC](https://racket.discourse.group/t/how-can-i-create-function-that-takes-an-instance-and-updates-it/820 "2022-03-25T16:59:18Z")
i am trying to complete a homework task based on structure,but when i came to the third bullet point where it asked me to create a function for a customer instance,i got confused how am i supposed to do that,because i do… --- ## [What are examples of use-cases for continuations?](https://racket.discourse.group/t/what-are-examples-of-use-cases-for-continuations/806)
**Author:** [@jcottrell](https://racket.discourse.group/u/jcottrell)\ **Replies:** 13\ **Last updated:** [March 24, 2022, 8:39pm UTC](https://racket.discourse.group/t/what-are-examples-of-use-cases-for-continuations/806 "2022-03-24T20:39:40Z")
I read the recent reddit question about finding the first odd number. I was going to respond with my meager knowledge about continuations that I'm trying to accumulate as I go through The Seasoned Schemer but first I tho… --- ## [Places to share racket related stuff online](https://racket.discourse.group/t/places-to-share-racket-related-stuff-online/821)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 0\ **Last updated:** [March 23, 2022, 5:40pm UTC](https://racket.discourse.group/t/places-to-share-racket-related-stuff-online/821 "2022-03-23T17:40:17Z")
We are all here because we like Racket. (There are a lot of different reasons) If you find, make or write something that is Racket related, it is good and right to share it with others who may be interested. My strateg… --- ## [A news or announcements category](https://racket.discourse.group/t/a-news-or-announcements-category/728)
**Author:** [@spdegabrielle](https://racket.discourse.group/u/spdegabrielle)\ **Replies:** 11\ **Last updated:** [March 22, 2022, 9:44pm UTC](https://racket.discourse.group/t/a-news-or-announcements-category/728 "2022-03-22T21:44:31Z")
A news or announcements category Categories have the advantage of allowing users to find posts more easily by navigating the site control their notification and emails settings In the case of a news or announcements … --- ## [Introducing Seq: A generic, isomorphic sequence library](https://racket.discourse.group/t/introducing-seq-a-generic-isomorphic-sequence-library/816)
**Author:** [@countvajhula](https://racket.discourse.group/u/countvajhula)\ **Replies:** 10\ **Last updated:** [March 22, 2022, 6:42pm UTC](https://racket.discourse.group/t/introducing-seq-a-generic-isomorphic-sequence-library/816 "2022-03-22T18:42:00Z")
Hi all, If you use Alexis King's Generic Collections (data/collection) library for generic sequences and collections, you may be interested in this package I put up recently. Ever since I discovered data/collection, wh… --- ## [When would I use boxes?](https://racket.discourse.group/t/when-would-i-use-boxes/813)
**Author:** [@rmuller](https://racket.discourse.group/u/rmuller)\ **Replies:** 9\ **Last updated:** [March 21, 2022, 3:36pm UTC](https://racket.discourse.group/t/when-would-i-use-boxes/813 "2022-03-21T15:36:37Z")
I'm enjoying the time I'm spending learning Racket and Scheme. One thing that has puzzled me is the topic of boxes. The guide says that "A box is like a single-element vector". Okay, but why would I want to use a box rat… --- ## [Racket Commons - A collection of modules I wrote over the years](https://racket.discourse.group/t/racket-commons-a-collection-of-modules-i-wrote-over-the-years/801)
**Author:** [@Dexter](https://racket.discourse.group/u/Dexter)\ **Replies:** 3\ **Last updated:** [March 21, 2022, 3:31pm UTC](https://racket.discourse.group/t/racket-commons-a-collection-of-modules-i-wrote-over-the-years/801 "2022-03-21T15:31:35Z")
Hey there, I just put together a large collection of procedures I wrote over the years. Each collection is grouped in a module. These are the procs I use the most when developing Racket apps and tools. Warning: some of … --- ## [CSV to SQL v1.1](https://racket.discourse.group/t/csv-to-sql-v1-1/815)
**Author:** [@Dexter](https://racket.discourse.group/u/Dexter)\ **Replies:** 0\ **Last updated:** [March 21, 2022, 3:28pm UTC](https://racket.discourse.group/t/csv-to-sql-v1-1/815 "2022-03-21T15:28:35Z")
Hey there, I just released a revised version of my CSV to SQL conversion tool. This small tool converts any CSV file to a list of SQL UPDATE queries. It assumes the first column is the primary ID to base itself on, and … --- ## [Scheme+ for Racket](https://racket.discourse.group/t/scheme-for-racket/798)
**Author:** [@damien\_mattei](https://racket.discourse.group/u/damien_mattei)\ **Replies:** 1\ **Last updated:** [March 21, 2022, 10:57am UTC](https://racket.discourse.group/t/scheme-for-racket/798 "2022-03-21T10:57:53Z")
Hello, i have port my Scheme+ for Racket language: Scheme+ is an extension of the syntax of the Scheme language. Scheme+ makes it easy the assignment of Scheme objects in infix (works also in prefix) notation with a fe… --- ## [Futures in 8.4 cs and 8.4 bc](https://racket.discourse.group/t/futures-in-8-4-cs-and-8-4-bc/809)
**Author:** [@joskoot](https://racket.discourse.group/u/joskoot)\ **Replies:** 7\ **Last updated:** [March 20, 2022, 2:52pm UTC](https://racket.discourse.group/t/futures-in-8-4-cs-and-8-4-bc/809 "2022-03-20T14:52:48Z")
Hi I have a program using futures. It runs very well with DrRacket 8.4 cs. With DrRacket 8.4 bc it seems to use one processor only. Is this a known problem? If not I can send the source code (about 500 lines) Detai… --- ## [Huge values of exact numbers](https://racket.discourse.group/t/huge-values-of-exact-numbers/805)
**Author:** [@dstorrs](https://racket.discourse.group/u/dstorrs)\ **Replies:** 1\ **Last updated:** [March 17, 2022, 7:29pm UTC](https://racket.discourse.group/t/huge-values-of-exact-numbers/805 "2022-03-17T19:29:27Z")
While reading through section 4.3 Numbers of the Reference, I noticed this: The precision and size of exact numbers is limited only by available memory (and the precision of operations that can produce irrational numbe… --- ## [Multi Process Racket (or even distributed)](https://racket.discourse.group/t/multi-process-racket-or-even-distributed/785)
**Author:** [@simonls](https://racket.discourse.group/u/simonls)\ **Replies:** 5\ **Last updated:** [March 17, 2022, 4:29pm UTC](https://racket.discourse.group/t/multi-process-racket-or-even-distributed/785 "2022-03-17T16:29:36Z")
I wrote this in response to another question, but also to get these things out of my head and written down. I am also curious about other interesting similar or related tools. Personally I don't have done a lot of multi… --- ## [How to deal with \`let/cc\` in typed racket?](https://racket.discourse.group/t/how-to-deal-with-let-cc-in-typed-racket/795)
**Author:** [@dannypsnl](https://racket.discourse.group/u/dannypsnl)\ **Replies:** 3\ **Last updated:** [March 16, 2022, 2:29am UTC](https://racket.discourse.group/t/how-to-deal-with-let-cc-in-typed-racket/795 "2022-03-16T02:29:11Z")
(: foo : -\> Integer) (define (foo) (let/cc r (r 1))) The above program will report Type Checker: Cannot apply expression of type Any, since it is not a function type in: (r 1) How to let type checker knows the t… --- ## [Logging to a single file from multiple loggers](https://racket.discourse.group/t/logging-to-a-single-file-from-multiple-loggers/781)
**Author:** [@dstorrs](https://racket.discourse.group/u/dstorrs)\ **Replies:** 11\ **Last updated:** [March 15, 2022, 7:40pm UTC](https://racket.discourse.group/t/logging-to-a-single-file-from-multiple-loggers/781 "2022-03-15T19:40:54Z")
I feel dumb having to ask this, but here we go. Various files in my CLI application define loggers -- there's a (define-logger users) in the users.rkt file, and a (define-logger files) in files.rkt and so on. I'd like … --- ## [Tangerine now supports exporting color models via the new PLY exporter](https://racket.discourse.group/t/tangerine-now-supports-exporting-color-models-via-the-new-ply-exporter/803)
**Author:** [@Aeva](https://racket.discourse.group/u/Aeva)\ **Replies:** 0\ **Last updated:** [March 15, 2022, 6:57pm UTC](https://racket.discourse.group/t/tangerine-now-supports-exporting-color-models-via-the-new-ply-exporter/803 "2022-03-15T18:57:39Z")
Here's a link with some pictures: https://twitter.com/ladyaeva/status/1503639297643139072 --- ## [How can i nest an expression to use resulting function only once?](https://racket.discourse.group/t/how-can-i-nest-an-expression-to-use-resulting-function-only-once/791)
**Author:** [@osman44](https://racket.discourse.group/u/osman44)\ **Replies:** 1\ **Last updated:** [March 13, 2022, 11:45pm UTC](https://racket.discourse.group/t/how-can-i-nest-an-expression-to-use-resulting-function-only-once/791 "2022-03-13T23:45:11Z")
I am trying to nest this already designed function ,so the function place-image is only used once,however,i have tried different ways but i keep getting errors,this is the closest i could get to but it returns an error d… --- ## [How do I add types to these wrapped function in Typed Racket?](https://racket.discourse.group/t/how-do-i-add-types-to-these-wrapped-function-in-typed-racket/783)
**Author:** [@Decabytes](https://racket.discourse.group/u/Decabytes)\ **Replies:** 0\ **Last updated:** [March 11, 2022, 4:19am UTC](https://racket.discourse.group/t/how-do-i-add-types-to-these-wrapped-function-in-typed-racket/783 "2022-03-11T04:19:20Z")
I was adding types to a library and I ran into some ctypes I'm unsure how to annotate. They are (\_fun -\> \_pointer) (\_fun -\> \_double) Does the pointer get wrapped as a integer, and the double a float? What if I need to … --- ## [Welcome to Racket Discussions Discourse](https://racket.discourse.group/t/welcome-to-racket-discussions-discourse/7)
**Author:** [@system](https://racket.discourse.group/u/system)\ **Replies:** 2\ **Last updated:** [November 22, 2021, 8:05am UTC](https://racket.discourse.group/t/welcome-to-racket-discussions-discourse/7 "2021-11-22T08:05:13Z")
Welcome! This is a friendly and inclusive place to ask questions, show off neat projects, and participate in the life of this fairly awesome family of languages and its ecosystems. :racket: :racketscript: :star\_struck: … --- ## [Trying to get started](https://racket.discourse.group/t/trying-to-get-started/793)
**Author:** [@pcanz](https://racket.discourse.group/u/pcanz)\ **Replies:** 1\ **Last updated:** [March 13, 2022, 3:15pm UTC](https://racket.discourse.group/t/trying-to-get-started/793 "2022-03-13T15:15:47Z")
Hi, I am trying to get started with Racket, but I could not get the download to work. It was not clear to me who or how to ask for help. I looked around the Racket main site https://racket-lang.org but could not see a… --- ## [\[ann\] kafka-lib](https://racket.discourse.group/t/ann-kafka-lib/790)
**Author:** [@bogdan](https://racket.discourse.group/u/bogdan)\ **Replies:** 0\ **Last updated:** [March 13, 2022, 11:01am UTC](https://racket.discourse.group/t/ann-kafka-lib/790 "2022-03-13T11:01:55Z")
I’ve written a pure-Racket client for Apache Kafka. It’s far from feature-complete at this point, but the basics are there, so check it out if you’re interested in using Kafka with Racket. Feedback welcome! [Previous page](https://racket.discourse.group/latest.md?page=61) [Next page](https://racket.discourse.group/latest.md?page=63)