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clojurians | clojure | got it; thanks | 2017-11-27T22:49:24.000107 | Berry |
clojurians | clojure | I'm trying to download a dependency, jai_core, from here <https://repository.jboss.org/nexus/content/repositories/thirdparty-releases/javax/media/jai-core/1.1.3/>. I added the repository to my project.clj like this `:repositories [[["jboss-third-party" "<https://repository.jboss.org/nexus/content/repositories/thirdparty-releases/>"]]]`. I still get an error message like this though `Could not find artifact javax.media:jai_core:jar:1.1.3 in jboss-third-party (<https://repository.jboss.org/nexus/content/repositories/thirdparty-releases/>)` | 2017-11-28T02:37:47.000044 | Mark |
clojurians | clojure | What am I doing wrong? | 2017-11-28T02:37:53.000033 | Mark |
clojurians | clojure | You need to request `jai-core` not `jai_core` | 2017-11-28T02:50:01.000299 | Shira |
clojurians | clojure | hm | 2017-11-28T02:54:52.000322 | Mark |
clojurians | clojure | I can't find any uses of jai_core though, I'm thinking this is a transitive dependency | 2017-11-28T02:55:53.000118 | Mark |
clojurians | clojure | <https://mvnrepository.com/artifact/javax.media/jai_core/1.1.3> ah, there's jai-core and jai_core :slightly_smiling_face: | 2017-11-28T02:56:19.000112 | Mark |
clojurians | clojure | Thanks for the tip | 2017-11-28T02:56:29.000084 | Mark |
clojurians | clojure | what's the cljs equiv of clojure.edn ? | 2017-11-28T05:02:53.000078 | Berry |
clojurians | clojure | do I need a separate library, or is this part of clojure? | 2017-11-28T05:03:04.000141 | Berry |
clojurians | clojure | it's transitively part of cljs | 2017-11-28T05:04:19.000337 | Kareen |
clojurians | clojure | `cljs.tools.reader.edn` | 2017-11-28T05:04:25.000299 | Kareen |
clojurians | clojure | or `clojure.tools.reader.edn`, as you prefer | 2017-11-28T05:04:32.000126 | Kareen |
clojurians | clojure | ```
#?(:cljs [cljs.tools.reader.edn :as edn]
:clj [clojure.edn :as edn])
```
is there a better way to write this, or do I need the conditional ? (this is for a cljc file) | 2017-11-28T05:05:54.000102 | Berry |
clojurians | clojure | you can use `clojure.tools.reader.edn` in both clj and cljs | 2017-11-28T05:12:22.000336 | Kareen |
clojurians | clojure | otherwise what you have is ok | 2017-11-28T05:12:35.000049 | Kareen |
clojurians | clojure | yay for tools.reader! | 2017-11-28T05:14:04.000399 | Fe |
clojurians | clojure | I couldn't figure out how to start clojure 1.9. from the command line (sans boot tools) using `java -cp` because of the additional dependency (now that `java -jar clojure.jar` is not sufficient anymore). Specifically
- which version of spec is needed for clojure-1.9.0-rc2?
- is `java -cp clojure.jar:spec.jar clojure.main` the recommended way to start this?
- is this documented somewhere? This would be a good candidate for the release notes as it might catch users switching to 1.9 unaware | 2017-11-28T07:04:03.000121 | Fe |
clojurians | clojure | hello, channel | 2017-11-28T07:19:00.000303 | Idella |
clojurians | clojure | > If you’ve spent years learning tricks to make your [multi-threaded] code work at all, let alone rapidly, with locks and semaphores and critical sections, you will be disgusted when you realize it was all for nothing. If there’s one lesson we’ve learned from 30+ years of concurrent programming, it is: just don’t share state. It’s like two drunkards trying to share a beer. It doesn’t matter if they’re good buddies. Sooner or later, they’re going to get into a fight. And the more drunkards you add to the table, the more they fight each other over the beer. The tragic majority of MT applications look like drunken bar fights.
~ <http://zguide.zeromq.org/page:all> | 2017-11-28T07:33:21.000039 | Nilda |
clojurians | clojure | hello everyone, is there a function equivalent of haskells `partition :: (a -> Bool) -> [a] -> ([a], [a]) ` in clojure? | 2017-11-28T07:58:30.000060 | Amado |
clojurians | clojure | <@Amado>: <https://clojuredocs.org/clojure.core/partition-by> | 2017-11-28T07:59:41.000201 | Nilda |
clojurians | clojure | <@Amado> Not really, but `group-by` is close | 2017-11-28T07:59:44.000291 | Randee |
clojurians | clojure | That's very different I think. | 2017-11-28T08:00:09.000329 | Randee |
clojurians | clojure | Many programming languages (also e.g. Kotlin) output only 2 vector for `partition` | 2017-11-28T08:00:38.000114 | Randee |
clojurians | clojure | Alright, my bad | 2017-11-28T08:01:20.000496 | Nilda |
clojurians | clojure | <@Nilda>, im not sure if ive understood the docs right | 2017-11-28T08:06:28.000293 | Amado |
clojurians | clojure | <@Fe> two options: 1- use the new `clj` script 2- the just released 1.9.0-RC2 has a standalone jar, it's documented in the readme | 2017-11-28T08:06:33.000292 | Kareen |
clojurians | clojure | ```
(partition-by even? [1 2 3 4 5 6 7 8])
;=> ((1) (2) (3) (4) (5) (6) (7) (8))
``` | 2017-11-28T08:07:25.000475 | Amado |
clojurians | clojure | This will be documented on the Getting Started page on release but there are several answers.
1) use a build tool like lein, boot, maven, etc. If you include Clojure 1.9 as a dependency, it will also pull in its dependencies automatically (spec.alpha and core.specs.alpha).
2) use the new Clojure cli scripts doc’ed at <https://clojure.org/guides/deps_and_cli>. If you’re on a Mac this is as simple as `brew install clojure` then `clj`.
3) build a stand-alone jar from the Clojure git repo - git clone the repo and then follow the directions in the readme.
4) Download the jars for Clojure, spec.alpha, and core.specs.alpha and manually create the classpath. This is probably the most cumbersome | 2017-11-28T08:07:30.000086 | Sonny |
clojurians | clojure | id like 2 lists as a result | 2017-11-28T08:07:53.000456 | Amado |
clojurians | clojure | My suggestion is incorrect for what you have in mind, I misunderstood the purpose of partition in Haskell. | 2017-11-28T08:07:59.000306 | Nilda |
clojurians | clojure | Give the `group-by` suggestion by <@Randee> a whirl, it’s more likely what you’re looking for. | 2017-11-28T08:08:47.000489 | Nilda |
clojurians | clojure | found the solution, ended up with `(vals (group-by even? [1 2 3 4 5 6 7 8]))` | 2017-11-28T08:09:30.000197 | Amado |
clojurians | clojure | group-by | 2017-11-28T08:09:32.000309 | Kareen |
clojurians | clojure | yep | 2017-11-28T08:09:35.000261 | Kareen |
clojurians | clojure | <@Amado> note that using vals is probably incorrect | 2017-11-28T08:10:05.000486 | Kareen |
clojurians | clojure | group by returns an unordered map | 2017-11-28T08:10:14.000250 | Kareen |
clojurians | clojure | no guaranteed that you'll get [truthy falsy] vs [falsy truthy] | 2017-11-28T08:10:26.000046 | Kareen |
clojurians | clojure | +1 to `cloogle` with spec | 2017-11-28T08:10:49.000097 | Jutta |
clojurians | clojure | hmm | 2017-11-28T08:14:40.000475 | Amado |
clojurians | clojure | `(defn haskell-partition [f coll]
(map (group-by f coll) [true false]))` | 2017-11-28T08:33:21.000448 | Cecilia |
clojurians | clojure | (haskell-partition even? (range 10))
=> ([0 2 4 6 8] [1 3 5 7 9]) | 2017-11-28T08:33:29.000377 | Cecilia |
clojurians | clojure | (threads do not support inline code blocks, which sucks, try to bear with me) | 2017-11-28T08:33:45.000160 | Cecilia |
clojurians | clojure | and I’m not 100% certain if that is actually what that haskell function does but I think it gets close enough | 2017-11-28T08:34:15.000106 | Cecilia |
clojurians | clojure | let me put my suggestion here, it’s now hidden inside a thread:
```
(defn haskell-partition [f coll]
(map (group-by f coll) [true false]))
(haskell-partition even? (range 10))
=> ([0 2 4 6 8] [1 3 5 7 9])
``` | 2017-11-28T08:36:32.000131 | Cecilia |
clojurians | clojure | this way order is guaranteed | 2017-11-28T08:37:29.000573 | Cecilia |
clojurians | clojure | thank you! | 2017-11-28T08:39:38.000605 | Amado |
clojurians | clojure | np | 2017-11-28T08:39:43.000280 | Cecilia |
clojurians | clojure | it is not always obvious that you can use maps as functions :slightly_smiling_face: | 2017-11-28T08:41:12.000070 | Cecilia |
clojurians | clojure | Hm the rc2 link on <https://clojure.org/community/downloads> is broken | 2017-11-28T09:03:46.000035 | Fe |
clojurians | clojure | cc: <@Sonny> | 2017-11-28T09:03:54.000615 | Fe |
clojurians | clojure | <@Kareen>, do you know if the standalone jar is published somewhere? | 2017-11-28T09:05:23.000470 | Fe |
clojurians | clojure | no | 2017-11-28T09:05:35.000370 | Kareen |
clojurians | clojure | it's just a local build | 2017-11-28T09:05:43.000336 | Kareen |
clojurians | clojure | as the build profile names suggests | 2017-11-28T09:05:49.000276 | Kareen |
clojurians | clojure | thanks for the reply! building the classpath manually is fine by me - looks like you can see the correct spec.alpha and core.spec.alpha versions here: <https://mvnrepository.com/artifact/org.clojure/clojure/1.9.0-RC1> | 2017-11-28T09:08:36.000363 | Fe |
clojurians | clojure | Ah yeah, I need to update that page. This just changed as of yesterday. | 2017-11-28T09:10:22.000408 | Sonny |
clojurians | clojure | Yep, but note that the reason for breaking these out is to allow them to change more quickly than Clojure so there won’t be one single version that is applicable necessarily | 2017-11-28T09:12:01.000314 | Sonny |
clojurians | clojure | We have a weird issue where some go routines stop working after about 5hrs - any ideas what we can look at ? | 2017-11-28T09:24:53.000174 | Celina |
clojurians | clojure | when I try to build the classpath manually I get `Could not locate clojure/spec/alpha__init.class or clojure/spec/alpha.clj on classpath` | 2017-11-28T09:25:30.000331 | Fe |
clojurians | clojure | look for blocking IO inside `go` blocks | 2017-11-28T09:25:31.000390 | Kareen |
clojurians | clojure | will that hold up all the go routines though ? | 2017-11-28T09:25:55.000336 | Celina |
clojurians | clojure | blocking io is almost always the culprit | 2017-11-28T09:25:55.000718 | Weston |
clojurians | clojure | <@Celina> go routines execute in a shared threadpool | 2017-11-28T09:26:15.000295 | Kareen |
clojurians | clojure | if you block all the threads available in that threadpool, nothing will gets executed anymore | 2017-11-28T09:26:31.000590 | Kareen |
clojurians | clojure | it's just 8 threads even so it's quite easy to break if you're not careful | 2017-11-28T09:26:45.000647 | Weston |
clojurians | clojure | <@Fe> how are you bulding that cp? | 2017-11-28T09:27:14.000197 | Kareen |
clojurians | clojure | thanks folks - off to debug | 2017-11-28T09:27:35.000156 | Celina |
clojurians | clojure | <@Kareen>, I had a typo | 2017-11-28T09:33:23.000481 | Fe |
clojurians | clojure | it works now - here's a simple script to download clojure manually: <https://gist.github.com/pesterhazy/afdfa47ac04d94ee16b5f2e8ddbb0bb1> | 2017-11-28T09:33:39.000449 | Fe |
clojurians | clojure | don't do that | 2017-11-28T09:34:40.000409 | Kareen |
clojurians | clojure | right, so the version in clojure's pom is essentially the minimal version of those extra deps | 2017-11-28T09:34:56.000805 | Fe |
clojurians | clojure | use the new clj script instead | 2017-11-28T09:35:15.000010 | Kareen |
clojurians | clojure | no | 2017-11-28T09:35:21.000218 | Fe |
clojurians | clojure | why? it basically does that for you | 2017-11-28T09:35:33.000449 | Kareen |
clojurians | clojure | I understand, but this is simple and I know exactly what it does - it's the moral equivalent of the standalone jar in clojure 1.8 | 2017-11-28T09:36:37.000409 | Fe |
clojurians | clojure | clojure is just a jar, remember? | 2017-11-28T09:37:08.000640 | Fe |
clojurians | clojure | so what? | 2017-11-28T09:37:12.000726 | Kareen |
clojurians | clojure | (or three jars) | 2017-11-28T09:37:13.000337 | Fe |
clojurians | clojure | meh | 2017-11-28T09:37:17.000218 | Kareen |
clojurians | clojure | feels like NIH tbh | 2017-11-28T09:37:24.000435 | Kareen |
clojurians | clojure | I don't see any point in reinventing something that has now an official impl | 2017-11-28T09:37:42.000488 | Kareen |
clojurians | clojure | but you're free to do as you think best :) | 2017-11-28T09:38:02.000082 | Kareen |
clojurians | clojure | all `clj` does is download your artifacts and build a cacheable classpath for you, nothing more than that or magical | 2017-11-28T09:39:38.000707 | Kareen |
clojurians | clojure | `clj` is wonderful, but that doesn't mean that it's not useful to build a shell script to understand how it works | 2017-11-28T09:40:57.000178 | Fe |
clojurians | clojure | I'm not saying it's not useful to build a simplified version of X to understand how it works, I'm saying if you need to use it, it's probably better to use X instead. in this case, your script will break when clojure adds a new dependency. `clj` would handle that automatically | 2017-11-28T09:46:28.000396 | Kareen |
clojurians | clojure | it won't break so long as I don't update the clojure version :slightly_smiling_face: | 2017-11-28T09:54:21.000536 | Fe |
clojurians | clojure | Hi, is `ex-info` json serializable? | 2017-11-28T10:14:34.000564 | Jacalyn |
clojurians | clojure | <@Jacalyn> ex-info can contain any java objects, so it depends on the contents | 2017-11-28T10:15:18.000385 | Fe |
clojurians | clojure | This doesn't seem to work:
```
(try (throw (ex-info "testss" {:a 3}))
(catch Exception e
(clojure.data.json/write-str (Throwable->map e))))
=> Exception Don't know how to write JSON of class java.lang.Class clojure.data.json/write-generic (json.clj:385)
``` | 2017-11-28T10:15:28.000532 | Jacalyn |
clojurians | clojure | What about that case though ^ | 2017-11-28T10:15:33.000609 | Jacalyn |
clojurians | clojure | get it using ex-data? | 2017-11-28T10:15:51.000011 | Fe |
clojurians | clojure | Yeah, if I did that, I would lose the Message. | 2017-11-28T10:16:07.000481 | Jacalyn |
clojurians | clojure | which in this case above is "testss". | 2017-11-28T10:16:22.000397 | Jacalyn |
clojurians | clojure | it says right in the error message what the problem is | 2017-11-28T10:26:53.000684 | Tai |
clojurians | clojure | you’re trying to serialize an object of the class java.lang.Class, and your json writer doesn’t know how to do that | 2017-11-28T10:27:15.000480 | Tai |
clojurians | clojure | Ah thank you, it's a macro so I must evaluate it?
```
(try (throw (ex-info "testss" {:a 3}))
(catch Exception e
`(json/write-str (Throwable->map ~e))))
``` | 2017-11-28T10:28:08.000056 | Jacalyn |
clojurians | clojure | no, being a macro doesn’t have anything to do with it. `(Throwable->map e)` produces something that has a java.lang.Class object inside it. | 2017-11-28T10:29:12.000427 | Tai |
clojurians | clojure | Ok but then how can you json serialize a generic ex-info? | 2017-11-28T10:30:10.000599 | Jacalyn |
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