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clojurians | clojure | <@Margaret> that looks like an explanation!
However I get
```
Caused by java.lang.RuntimeException
Unable to resolve symbol: KafkaMetricsReporter$ in this context
```
I checked as well I can compile the Java code in the answer just fine
I tried `(-> KafkaMetricsReporter (.MODULE$) (.startReporters (VerifiableProperties. {})))`
but then I get
```
Unhandled java.lang.IllegalArgumentException
No matching field found: MODULE$ for class java.lang.Class
``` | 2017-10-30T14:54:41.000167 | Jonnie |
clojurians | clojure | Sorry, disregard the first point, I was missing an import for `KafkaMetricsReporter$` | 2017-10-30T14:58:00.000483 | Jonnie |
clojurians | clojure | This worked! `(.startReporters (KafkaMetricsReporter$/MODULE$) (VerifiableProperties. props))` | 2017-10-30T14:59:01.000512 | Jonnie |
clojurians | clojure | Thanks a lot! | 2017-10-30T14:59:06.000228 | Jonnie |
clojurians | clojure | You have unnecessary parens around the access of the static MODULE$ value - they are accepted but not needed (see (Math/PI) for a more obvious version of what that is doing) | 2017-10-30T15:05:06.000249 | Margaret |
clojurians | clojure | ```user=> (Math/PI)
3.141592653589793
user=> Math/PI
3.141592653589793``` | 2017-10-30T15:10:00.000520 | Margaret |
clojurians | clojure | Hey folks, I've been working on a single-purpose lib for exploring complex data structures from the REPL as rapidly as possible, with minimum keystrokes. If that's something you spend time doing, I'd love for you to try it out & let me know how it goes. I'll eventually post it in <#C06MAR553|announcements>, but I'm hoping to get feedback from a few more people first. Thanks!
<https://github.com/eggsyntax/datawalk> | 2017-10-30T15:34:06.000439 | Lavenia |
clojurians | clojure | it also accepts `(. MATH PI)` - which is pretty much only useful for writing macros | 2017-10-30T15:36:40.000203 | Margaret |
clojurians | clojure | I know about core/bean but does any other lib/function exist that would also allow customizing what to read and include public members as well, not just bean methods? | 2017-10-30T16:16:50.000013 | Douglass |
clojurians | clojure | <https://github.com/arohner/clj-wallhack> might be a good start | 2017-10-30T16:18:10.000658 | Rebeca |
clojurians | clojure | oh that's specifically for reading specific protected members | 2017-10-30T16:21:06.000090 | Douglass |
clojurians | clojure | seems like obj->map from <https://dzone.com/articles/clojure-converting-java-object> is close to what I need | 2017-10-30T16:29:22.000242 | Douglass |
clojurians | clojure | it reflectively reads members private or otherwise | 2017-10-30T16:39:01.000253 | Rebeca |
clojurians | clojure | what you want is to reflectively read members | 2017-10-30T16:39:20.000627 | Rebeca |
clojurians | clojure | There's a gotcha hiding in using a keyword dispatch on multimethods with two args... can you see it? | 2017-10-30T17:52:40.000368 | Wendi |
clojurians | clojure | ```user=> (defmulti m :type)
#'user/m
user=> (defmethod m :t1 [a b] a)
#object[clojure.lang.MultiFn 0x3eb5ed75 "clojure.lang.MultiFn@3eb5ed75"]
user=> (m {} :t1)
{}``` | 2017-10-30T17:52:43.000488 | Wendi |
clojurians | clojure | heh | 2017-10-30T18:07:45.000019 | Kareen |
clojurians | clojure | I'm doing lexing via regex. Is there a re-find which takes an index as an argument? I want to say (search for this regex, but pretend the start of the string is at index i). This is to avoid constant calls to substring. | 2017-10-30T19:41:12.000229 | Berry |
clojurians | clojure | is there a clojure builtin for `(when x (f x))` ? it seems like the type of thing someone has assigned a word to | 2017-10-30T19:47:28.000171 | Berry |
clojurians | clojure | `(some-> x (f))` | 2017-10-30T19:49:43.000131 | Margaret |
clojurians | clojure | for your lexer, do you plan on support laziness? ie. being able to parse a stream without consuming the whole stream? | 2017-10-30T19:50:26.000122 | Jonas |
clojurians | clojure | there’s several options for readers in java as well as things like `java.util.Scanner` | 2017-10-30T19:50:57.000211 | Jonas |
clojurians | clojure | that may makes things easier | 2017-10-30T19:51:11.000233 | Jonas |
clojurians | clojure | for eg, <https://docs.oracle.com/javase/1.5.0/docs/api/java/util/Scanner.html#next(java.util.regex.Pattern)> | 2017-10-30T19:51:39.000131 | Jonas |
clojurians | clojure | <@Berry> regarding regex with settable input position, I bet Scanner would help <https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html> | 2017-10-30T19:51:55.000187 | Margaret |
clojurians | clojure | oh, haha | 2017-10-30T19:52:05.000109 | Margaret |
clojurians | clojure | :stuck_out_tongue: | 2017-10-30T19:52:08.000202 | Jonas |
clojurians | clojure | your link is much better. not sure why the first result that came up for me was for java 1.5 | 2017-10-30T19:53:05.000018 | Jonas |
clojurians | clojure | <@Margaret> <@Jonas>: I forgot to mention, this is a *.cljc file, so I need jvm + js // I guess I should now look into js regex libraries :slightly_smiling_face: | 2017-10-30T20:00:29.000150 | Berry |
clojurians | clojure | re-find has been great so far in that it works in both | 2017-10-30T20:00:37.000298 | Berry |
clojurians | clojure | looks like this has a similar api <http://sstephenson.github.io/strscan-js/> | 2017-10-30T20:02:04.000060 | Margaret |
clojurians | clojure | <@Berry> also double check if subs is actually a problem - it should be cheap (on the jvm at least) since java strings are immutable | 2017-10-30T20:03:23.000147 | Margaret |
clojurians | clojure | <@Margaret>: some-> is precisely what I need -- thanks | 2017-10-30T20:13:31.000048 | Berry |
clojurians | clojure | though it appears that example can besimplified to (some-> x f) | 2017-10-30T20:13:48.000073 | Berry |
clojurians | clojure | I like to use parens with arrow macros, it's a personal style preference | 2017-10-30T20:15:00.000204 | Margaret |
clojurians | clojure | <@Sonny> I can't see this would ever be desirable behaviour but could be surprising. Do you think a patch would be considered? Something which did (k arg1) instead of (apply k args) for the keyword case. | 2017-10-30T20:34:56.000113 | Wendi |
clojurians | clojure | There are other variadic cases where I don’t think this would work | 2017-10-30T21:40:41.000095 | Sonny |
clojurians | clojure | Fair enough. | 2017-10-30T22:25:16.000225 | Wendi |
clojurians | clojure | It'd seem a shame to make a special case check for keyword? of the dispatch method | 2017-10-30T22:26:16.000081 | Wendi |
clojurians | clojure | I don’t understand why you have [a b] in that method - that just seems wrong | 2017-10-30T22:40:27.000003 | Sonny |
clojurians | clojure | Yes, the code works but is surprising. | 2017-10-30T22:48:09.000245 | Wendi |
clojurians | clojure | Say we have a multi-method which takes two args and we want to dispatch on a keyword from the first arg. | 2017-10-30T22:48:20.000341 | Wendi |
clojurians | clojure | The code does that. The dispatch keyword is called as a function (get) which can take one or two args. | 2017-10-30T22:48:55.000110 | Wendi |
clojurians | clojure | When get doesn't find the keyword the second arg is returned. | 2017-10-30T22:49:07.000246 | Wendi |
clojurians | clojure | That's the oddness. We expect the dispatch-fn to return nil but it returns `:t1`. | 2017-10-30T22:49:40.000064 | Wendi |
clojurians | clojure | To avoid this we need something like
```(defmulti m (fn [a b] (:type a)))``` | 2017-10-30T22:51:17.000155 | Wendi |
clojurians | clojure | That’s what you should have. The prior example is wrong | 2017-10-30T23:40:39.000054 | Sonny |
clojurians | clojure | Fair enough. Thanks. | 2017-10-31T00:26:55.000068 | Wendi |
clojurians | clojure | Hi, is there a name for the common design pattern of letting an HOF accept extra arguments that will be applied to the given function, e.g `swap!` or `update` ? | 2017-10-31T05:53:45.000460 | Rosia |
clojurians | clojure | The succession model is a term I've heard | 2017-10-31T07:11:37.000287 | Fe |
clojurians | clojure | that has more to do with describing behaviour than api | 2017-10-31T07:20:19.000325 | Kareen |
clojurians | clojure | if I have a local jar file, how can I include it in a project? i.e where should the jar be located and what do I need to add to the project file? (lein 2) | 2017-10-31T08:14:36.000029 | Jacob |
clojurians | clojure | Maybe this helps <https://www.pgrs.net/2011/10/30/using-local-jars-with-leiningen/> | 2017-10-31T09:06:24.000036 | Cecilia |
clojurians | clojure | Yeah, I just wasnt sure if 2011 was out of date... | 2017-10-31T09:18:15.000176 | Jacob |
clojurians | clojure | Playing around with `clj`, so I needed to figure out how it works, so I did | 2017-10-31T09:28:12.000009 | Virgil |
clojurians | clojure | ```14:27 $ clj --help
Usage: java -cp clojure.jar clojure.main [init-opt*] [main-opt] [arg*]
``` | 2017-10-31T09:28:17.000044 | Virgil |
clojurians | clojure | I might understand why `clj --help` mentions java, but I'd expect it to have a more specific help message? | 2017-10-31T09:29:14.000376 | Virgil |
clojurians | clojure | Is it really so convoluted to add a local jar to a project? | 2017-10-31T09:36:40.000312 | Jacob |
clojurians | clojure | Does anyone familiar with the salesforce API, know what would happen if I have push topic's set up to sync salesforce data to a standalone db, then a user's permissions change and the user is now long has access to a specific record, would the push topic send a `delete` update for the request that the user can no longer view? | 2017-10-31T10:13:42.000227 | Billye |
clojurians | clojure | A noob question: is it possible to make a http HEAD request in clojure without reverting to javaland (HttpURLConnection) or pulling in a third party dependency? | 2017-10-31T10:16:08.000416 | Joette |
clojurians | clojure | clojure.core has no http client unless you count slurp as one, and slurp doesn't support http methods options | 2017-10-31T10:18:22.000297 | Weston |
clojurians | clojure | so yeah, interop or clj-http&co | 2017-10-31T10:18:48.000343 | Weston |
clojurians | clojure | I find myself writing a lot of code of the form
`{:tag kw kw data ... other attribs ... }`
for ecample
`{:tag :pat :pat .... :name .... }`
thi seems a bit redundant | 2017-10-31T10:26:44.000406 | Berry |
clojurians | clojure | Good morning :slightly_smiling_face: Is anyone here familiar with Neanderthal? I'm trying to find some missing constants that are required in order to run the hello-world example. `(require '[uncomplicate.clojurecl.core :as uc])` from a repl in the example project gives me a `CompilerException java.lang.Exception: No namespace: uncomplicate.clojurecl.constants, compiling:(uncomplicate/clojurecl/core.clj:1:1)`. There is no `constants` namespace defined anywhere in the Neanderthal repo, and I can't find a repo in the Uncomplicate org that looks like it might have those constants. | 2017-10-31T12:11:04.000460 | Jesusa |
clojurians | clojure | Obviously <@Jesusa> you haven't got the correct setup to use `neanderthal` <http://neanderthal.uncomplicate.org/articles/getting_started.html#installation> `ClojureCL` (OpenCL) not installed correct | 2017-10-31T12:31:07.000836 | Lovie |
clojurians | clojure | you might like to try <#C08PLCRGT|uncomplicate> | 2017-10-31T12:32:52.000331 | Lovie |
clojurians | clojure | Maybe I should go over the opencl install again via the Neandertal instructions. I already have webcl working in Firefox, and opencl working from Python. | 2017-10-31T13:15:29.000860 | Jesusa |
clojurians | clojure | Thanks for the room link, I almost missed that | 2017-10-31T13:16:39.000510 | Jesusa |
clojurians | clojure | is there a good word for 'compute a bunch of auxiliary / derived data for caching purposes' ? (informatically theoretically, it adds nothing new, but it precomputes a bunch of lookup tables / caches) | 2017-10-31T13:38:53.000695 | Berry |
clojurians | clojure | it’s similar to how dynamic programming works, right? - organizing things so you can save and reuse partial calculations | 2017-10-31T13:39:36.000177 | Margaret |
clojurians | clojure | 'dynamic programming' is a very specific class of algorithms; where you save computation by remembering it
in my case, I'm pre-building lookup tables -- it's not quite the same | 2017-10-31T13:41:11.000720 | Berry |
clojurians | clojure | best word I have so far, is 'prep' | 2017-10-31T13:41:18.000283 | Berry |
clojurians | clojure | any reason you aren’t using memoize? | 2017-10-31T13:44:58.000360 | Margaret |
clojurians | clojure | err, so I have this structure which represents the 'precedence of each operator' | 2017-10-31T13:54:47.000148 | Berry |
clojurians | clojure | so it's something like:
[[:right "^"]
[:left "*" "/"]
[:left "+" "-"]] | 2017-10-31T13:55:12.000394 | Berry |
clojurians | clojure | now, given two ops, I want to know which has a higher precedence .. so I need to 'invert' the above vector of vectors, and cache the results, to get something like:
^ -> 3
* -> 2
/ -> 2
+ -> 1
- -> 1 | 2017-10-31T13:55:47.000109 | Berry |
clojurians | clojure | so I'm literally precomputing a map | 2017-10-31T13:56:09.000568 | Berry |
clojurians | clojure | I'm not particularly happy with 'prep', but it's the best word I can think of | 2017-10-31T13:56:41.000726 | Berry |
clojurians | clojure | why generalize it, why not just call it “build-precedence-map” or something mundane like that | 2017-10-31T14:00:17.000930 | Margaret |
clojurians | clojure | do you anticipate this being a common type of task? | 2017-10-31T14:00:25.000764 | Margaret |
clojurians | clojure | 1. why do you believe i'm trying to 'generalize' it?
2. 'build-inverse-precedence-map' is perfectly valid, but I was hoping for a shorter word | 2017-10-31T14:01:48.000006 | Berry |
clojurians | clojure | I'm not trying to 'write a more general function', I'm literally looking for a shorter func name. | 2017-10-31T14:02:13.000129 | Berry |
clojurians | clojure | tough if we don't know exactly what it returns and how you'll use it. If it just returns -1,0,1, `compare-by-precedence`. If it returns the lower of the two `lower-precedence`, if it returns a vector of the two ops sorted, `sort-be-precedence`. If it returns a map that allows you to lookup by operator token then `make-precedence-map` | 2017-10-31T14:08:29.000173 | Willow |
clojurians | clojure | ah, I see, I should have been clearer on input/output
```
input:
{:tag :grammar
...
:precs [[:right "^"] [:left "*" "/"] [:left "+" "-"]]
}
output
add a field
:inv-precs { "^" [3 :right] "*" [2 :left] "/" [2 :left] "+" [1 :left] "-" [1 :left]]
``` | 2017-10-31T14:20:10.000041 | Berry |
clojurians | clojure | i'm getting a compilation error in 1.9.0-beta3: `Caused by: java.lang.ClassNotFoundException: clojure.pprint` i definitely see it in the source/tests, and it's basically a new/empty project. any idea what i'm doing wrong? | 2017-10-31T14:41:24.000129 | Zola |
clojurians | clojure | <@Zola> How did you create the project? Have you edited it at all? What command are you using that produces that error? What does the source look like that it is complaining about? | 2017-10-31T14:46:37.000439 | Daniell |
clojurians | clojure | i used the lein-re-frame template and added just a few deps. you have a good point though... i'll start with a barebones project and rule out any weird dependency problems first. | 2017-10-31T14:52:38.000379 | Zola |
clojurians | clojure | sounds like some code was assuming clojure.pprint is loaded on startup (a bad assumption) | 2017-10-31T14:53:05.000213 | Margaret |
clojurians | clojure | dumb question i know, but why is that a bad assumption? | 2017-10-31T14:56:34.000723 | Zola |
clojurians | clojure | there’s some tooling which requires clojure.pprint, that often runs on startup, but it’s not something you can count on | 2017-10-31T14:56:58.000401 | Margaret |
clojurians | clojure | if you use a namespace, you should explicitly require it, even if it comes with clojure.core | 2017-10-31T14:57:12.000682 | Margaret |
clojurians | clojure | ahh okay, thank you | 2017-10-31T14:57:25.000170 | Zola |
clojurians | clojure | even for namespaces like <http://clojure.java.io|clojure.java.io> that are loaded by clojure.core itself, there’s no explicit promise that will be the case with the next clojure release, so it’s better to require it if you access it | 2017-10-31T14:59:04.000024 | Margaret |
clojurians | clojure | got it :slightly_smiling_face: | 2017-10-31T15:07:06.000326 | Zola |
clojurians | clojure | (by the way, that was exactly the problem) | 2017-10-31T15:12:26.000035 | Zola |
clojurians | clojure | is a lambda function the same as a closure? | 2017-11-01T02:32:23.000110 | Corazon |
clojurians | clojure | hey all - I'm having super slow compile times on my clojure app - I remember there being a way to report on which namespace the compiler is busy working on, but can't find it anywhere now? | 2017-11-01T05:09:34.000194 | Dimple |
clojurians | clojure | I suspect one or two namespaces to be culprits, so would like to identify them and then see what I can do | 2017-11-01T05:10:11.000169 | Dimple |
clojurians | clojure | <@Corazon> They are not the same. A lambda is a function as a value (you can assign it, pass it around, execute etc). A closure is an implementation detail. It has to do with visibility of symbols when the function is created inside another function (think of it as an implicit map). The inner function "closes over" the context of the outer function, thus creating a closure. This allows the inner fn to refer to symbols that are not declared locally to it. The wikipedia entry does a decent job describing it: <https://en.wikipedia.org/wiki/Closure_(computer_programming)> | 2017-11-01T05:15:08.000219 | Eliana |
clojurians | clojure | Cool | 2017-11-01T06:20:17.000151 | Corazon |
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