Disqus - Latest Comments for reborg

Re: Lazy sequences are not compatible with dynamic scope

reborg — Thu, 03 Jan 2019 16:41:23 -0000

Sorry for the confusion. The wrongly written macro (the one without syntax quoting) just simulates the behaviour inside "fn" for explanation only. Maybe worth focusing on the fact that (def s (binding [*my-value* 1] (map (constantly *my-value*) [1 2 3]))) works as expected. Looks like laziness is working properly provided there isn't a context where *my-value* is evaluating at macro expansion time.

Re: Lazy sequences are not compatible with dynamic scope

reborg — Thu, 03 Jan 2019 05:44:37 -0000

Mmmh, no, that's not related to lazyseqs. Or better, tangentially related. What you see here has to do with dereferencing vars at macro expansion VS execution time. "bound-fn" works by accident, you could just use "constantly" ("bound-fn" has a different goal: it copies dynamically bound values from a thread to another but there is no new thread here). The following reproduces the same effect:

(def ^:dynamic *my-value* 42) (defmacro get-my-value [] *my-value*) (binding [*my-value* 1] (get-my-value)) ;; 42

You can check what's going on by macroexpanding:

(require 'clojure.walk) (pprint (clojure.walk/macroexpand-all '(binding [*my-value* 1] (get-my-value)))) (let* [] (clojure.core/push-thread-bindings (clojure.core/hash-map #'*my-value* 1)) (try 42 (finally (clojure.core/pop-thread-bindings))))

"fn" is "macro-like" and is doing that trick in your example (you won't be able to macroexpand fn/fn* because they are special forms). "mapv" or "doall" forces evaluation after "binding" has been macroexpanded (and the var gets the new local binding).

Re: Building ETL pipelines with Clojure and transducers

reborg — Wed, 06 Sep 2017 18:30:04 -0000

(r/fold (constantly nil)
((comp (mapcat parse-json-file-reducible)
(filter valid-entry?)
(keep transform-entry-if-relevant)
(partition-all 1000)
(map save-into-database)) (constantly nil)) coll)

Re: Beyond Clojure: Prelude

reborg — Tue, 19 Apr 2016 09:05:11 -0000

Martin,

I respect your opinion and I'm happy to see you searching somewhere else, especially if what you're missing is caring about software. But (I'm pretty sure you thought this already) there's no silver bullet. I suppose what keeps you motivated is the most important thing at the end of the day.

As of the criticisms in your post, they are all good points and I'll be waiting for a similar post as soon as you have a couple years of ML-style typing under the belt :) What I wouldn't like instead (not your case) are people trying to do Haskell in Clojure. Using ideas from other languages is refreshing and inspiring (see the Racket type system for example) but trying to abuse a Lisp to write into something else is non-sense. In other words, I would fail the build big time if "grep -i monad file.clj" exits with a non-zero code! :)

Re: Clojure Weekly, Dec 3rd, 2014

reborg — Thu, 04 Dec 2014 02:02:07 -0000

Right, saw the thread on Clojure ML. Good idea though, will give it a go and report back next issue. Cheers.

Re: Clojure Weekly, July 9th, 2014

reborg — Wed, 09 Jul 2014 10:59:24 -0000

Thanks, I was confused by that and forgot the previous issue.

Re: Clojure Weekly, Jun 12th, 2014

reborg — Thu, 12 Jun 2014 10:46:28 -0000

Wow, dynamically generated class diagram :) Thanks, will definitely use.

Re: Clojure Weekly, April 1st, 2014

reborg — Wed, 02 Apr 2014 03:38:26 -0000

Thanks Alex for the clarification. I'm always amazed by how many useful things I don't know about clojure.core

Re: Clojure Weekly, March 11th, 2014

reborg — Wed, 12 Mar 2014 07:34:43 -0000

Will check that out too, thanks. The reason I'm linking that initial version of Jscheme is because it is directly linked from the dotLisp notes as the project starting point and dotLisp is cited a few times as the precursor of Clojure in terms of a Lisp running on an hosting VM (CLR in that case).

Re: Clojure Weekly, Feb 19th, 2014

reborg — Wed, 19 Feb 2014 07:39:21 -0000

Oh I see, it was so full of 8th Light pointers that I got confused. I suppose at least you work together :)

Anyway, going to edit the post and give credit to Steven. Thanks.

Re: Clojure Weekly, Oct 17th, 2013

reborg — Fri, 18 Oct 2013 04:14:49 -0000

Thanks for your comment Martin, good to hear it was a good conference, as expected (although what is linked here are blog posts and not tweets). I have recurring evidence though (from other conferences and user groups in the London Clojure community) of criticism toward TDD practitioners and vim users. For example: people declaring they created tests for their solution often generate a smile or two at the London Clojure dojos (ask Bruce). I have personally received negative feedback for using vim during a recent gig at Likely.co (London based Clojure shop). Yes, my experience is not necessarily the community. Still, I'd love to see diversity encouraged and not isolated.

Re: Clojure Weekly, April 30th, 2013

reborg — Tue, 30 Apr 2013 16:14:05 -0000

Thanks, fixed.

Re: Clojure weekly, Jan 28th, 2013

reborg — Wed, 30 Jan 2013 05:19:35 -0000

Thank you, good thoughts. That sounds like a good model to apply based on your corporate/team mindset. So I would say that if your team usually goes beyond the pure "getting the work done" showing general interest for new technologies or craftsmanship in software, you can pick Scala and be reasonably sure that when the "idiomatic jump" is required your team should be able to react. Of course Clojure should be a success in that context anyway. But if you pick Scala in a context where people are generally lazy and not interested in improving their skills, you'll probably end up with non-idiomatic Scala written the ugly Java way.

Re: Clojure weekly, Jan 28th, 2013

reborg — Tue, 29 Jan 2013 09:38:15 -0000

Since he's working at the Guardian, I assume is now working close to 100% in Scala, but I think he just recently joined. I can't make comparisons as well, since I never written a single line of Scala. But while I was kind of convinced by the argument that you can gradually learn FP using Scala, I'm less convinced now that this is a valid statement. The learning curve is definitely steeper if you come from an imperative language, but not steep enough to justify the adoption of an hybrid approach which assumes you're also going to take responsibility over the next phase: "now let's try to be more functional". It ain't gonna happen. Thoughts?

Re: Clojure weekly Aug 09-16 2012

reborg — Wed, 15 Aug 2012 13:10:00 -0000

Thanks for the doco pointer! As for the standard clojure-datalog dialect: I agree the underlying implementations are different and it's healthy to have multiple of them. It might be a good idea though to let the end user always use the same datalog-like syntax and switch the implementation as they like.

Re: Clojure weekly Aug 2-9 2012

reborg — Fri, 10 Aug 2012 01:09:45 -0000

Of course http://reborg.tumblr.com/ta...

Re: Tomatoes

reborg — Tue, 27 Jul 2010 06:37:10 -0000

Hey Scott, sorry for the late reply. I don't use a specific tool, but just a syntax highlighter for vim based on the TaskPaper format (http://www.hogbaysoftware.c.... What I like about TaskPaper is exactly the fact that it's a format specification like markdown is for HTML for example. You can then open your todo list with all the tools supporting the format. Inside VIM for example, the TaskPaper plugin add a few keyboard shortcuts to handle the todo list effectively. The "official" software from the link above is another nice graphical interface to the same format.

Re: http://reborg.tumblr.com/post/502805437

reborg — Wed, 07 Apr 2010 08:20:30 -0000

Totally agree. >90% won't get it or not interested and you shouldn't waste time trying to convincing them if they don't want to listen. That said, if your work is quality work and it's consistent over time, the fact that the PT is behind the success could start attracting some interest.

Re: MacRuby CoreData Tutorial

reborg — Sun, 27 Dec 2009 09:34:56 -0000

Update: fixed fetch error variable name

Re: MacRuby CoreData Tutorial

reborg — Wed, 09 Dec 2009 05:46:42 -0000

Update: removed static variables and fixed only-once initialization problem

Re: Pomodori

reborg — Fri, 20 Nov 2009 00:48:12 -0000

Hey Dan, thanks for the support. I still see a few weeks ahead of me mainly because I work on this a few hours a day. I'm the first to be frustrated because I had to switch to SL and I lost my tool. I know this is not a solution but for now maybe consider to use another neat tool out there: http://pomodoro.ugolandini.... which is not far from Pomodori. Damn, I'm sending customers away! :)

Re: Pomodori

reborg — Tue, 17 Nov 2009 04:04:11 -0000

Thanks Paolo!

Re: Life Lesson From CouchDB

reborg — Wed, 26 Aug 2009 18:51:47 -0000

Totally agree, I was not negating the existence of creative and artistic power in programming. I was thinking more from an average perspective. And while a few years ago something like software craftsmanship was not even mentioned, today is clear that programming is a discipline and as such there are practices. Creativity is always involved, it's just more structured than the past. At least, IMHO. Thanks for your experience report.

Re: Back From The Diet

reborg — Sat, 25 Jul 2009 02:48:27 -0000

Hey Trevor, I just went through the post, with a mix of people saying "oh no!" and others saying "go for it!". It seems to depend mostly on the mood and what you're doing at that time of your life. Mine is just one of those experiences, but I had to try myself. Good luck for your next media vacation!

Re: Webrat with RSpec, no Cucumber

reborg — Tue, 21 Jul 2009 11:12:25 -0000

Not sure, but I suspect you need to add a mapping: http://blog.davidchelimsky....
I'll try in the following days but if you find a solution before please let me know. Thanks.