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clojurians | clojure | I don’t know of a better option | 2017-12-07T17:56:53.000037 | Margaret |
clojurians | clojure | <@Margaret> ```((fn [m ks] (into (empty m) (select-keys m ks))) (sorted-map 3 "3" 1 "1" 2 "2") [1 3])``` returns ```{1 "1", 3 "3"}```, which 1.) still includes the keys (easy fix) and 2.) isn't in the same order as the original sorted-map | 2017-12-07T17:58:43.000274 | Raul |
clojurians | clojure | except maybe rewriting select-keys to use `(empty map)` | 2017-12-07T17:58:54.000055 | Margaret |
clojurians | clojure | wait, that sorted map literal is not the same order as the sorted-map | 2017-12-07T17:59:22.000376 | Margaret |
clojurians | clojure | actually no, that's fine | 2017-12-07T17:59:29.000134 | Raul |
clojurians | clojure | maybe you want something different, like an insertion ordered map | 2017-12-07T17:59:31.000210 | Margaret |
clojurians | clojure | sorted-map doesn't work like I thought it did :smile: | 2017-12-07T17:59:34.000336 | Raul |
clojurians | clojure | haha - there’s a lib with an insertion-sorted map out there | 2017-12-07T17:59:46.000494 | Margaret |
clojurians | clojure | eh...this is small enough, I'm just going to use a vector and iterate over values | 2017-12-07T17:59:48.000455 | Raul |
clojurians | clojure | (current size of vector: 2, expected size ~5) | 2017-12-07T18:00:05.000124 | Raul |
clojurians | clojure | performance isn't really an issue on that size | 2017-12-07T18:00:13.000205 | Raul |
clojurians | clojure | also if you use the insertion-ordered one, you can just iterate and filter for the keys you care about since seq would return them in order | 2017-12-07T18:00:20.000103 | Margaret |
clojurians | clojure | thanks for the input, <@Margaret> | 2017-12-07T18:00:26.000181 | Raul |
clojurians | clojure | np | 2017-12-07T18:00:30.000338 | Margaret |
clojurians | clojure | if I need to overwrite "print" and "equality", is deftype the right way to go ? | 2017-12-07T18:46:05.000352 | Berry |
clojurians | clojure | by print do you mean print-method (what pr uses) or toString (what str and print use) | 2017-12-07T18:47:13.000230 | Margaret |
clojurians | clojure | I wasn't even aware of that distinction. | 2017-12-07T18:47:29.000072 | Berry |
clojurians | clojure | print-method is a multimethod that decides how pr / prn show things - this is used for return values in the repl and is meant to be readable by the reader if possible | 2017-12-07T18:47:56.000130 | Margaret |
clojurians | clojure | this can be extended at any time (like any multimethod) | 2017-12-07T18:48:11.000352 | Margaret |
clojurians | clojure | toString is a method on object that is used for str and print / println, and it isn’t meant to be clojure readable, and needs to be defined when defining your class as a method on Object | 2017-12-07T18:48:45.000029 | Margaret |
clojurians | clojure | IIRC while defrecord does give you a nice toString you can override it… | 2017-12-07T18:49:03.000334 | Margaret |
clojurians | clojure | the XY problem is: I need t define toString/equality on int-array / float-array | 2017-12-07T18:49:41.000010 | Berry |
clojurians | clojure | <@Berry> ```(ins)user=> (defrecord Foo [] Object (toString [this] "hello"))
user.Foo
(ins)user=> (Foo.)
#user.Foo{}
(ins)user=> (str (Foo.))
"hello"``` | 2017-12-07T18:49:47.000047 | Margaret |
clojurians | clojure | oh - well you can’t change arrays but I guess you could make a thing that acts like one with new toString - I think you might need a more powerful tool than deftype for that since deftype can’t do concrete inheretance | 2017-12-07T18:50:36.000149 | Margaret |
clojurians | clojure | so you’d likely need proxy, or gen-class, or some java code | 2017-12-07T18:50:48.000122 | Margaret |
clojurians | clojure | I was thinking of creating an object, via deftype, which has one field, the array. | 2017-12-07T18:51:07.000137 | Berry |
clojurians | clojure | Then, I define print/equality on the deftype ... okay, so technically I'm not overwriting int-array float-array | 2017-12-07T18:51:23.000188 | Berry |
clojurians | clojure | but you can’t make other people think it’s an array, is the problem | 2017-12-07T18:51:24.000090 | Margaret |
clojurians | clojure | I'm defining a wrapper around them. | 2017-12-07T18:51:33.000083 | Berry |
clojurians | clojure | right - if you dont’ need to fool a consumer about the type, then that should work OK I think | 2017-12-07T18:51:55.000355 | Margaret |
clojurians | clojure | the trick might be methods on array you can’t extend | 2017-12-07T18:52:17.000133 | Margaret |
clojurians | clojure | or things like aget / aset etc. which… dunno how you would make those work without extending the class itself | 2017-12-07T18:52:42.000164 | Margaret |
clojurians | clojure | I'm writing an interpreter, like poor-man's matlab/numpy. These "virtual rrays" can only be accessed by interfaces I define. | 2017-12-07T18:52:45.000273 | Berry |
clojurians | clojure | oh neverm ind you should be fine then | 2017-12-07T18:52:56.000296 | Margaret |
clojurians | clojure | I think we are loudly agreeing. :slightly_smiling_face: | 2017-12-07T18:53:01.000040 | Berry |
clojurians | clojure | Uh. Switching to HoneySQL. Can't find how add RETURNING into query builder. Can anyone help? | 2017-12-07T19:48:11.000184 | Marcos |
clojurians | clojure | Found! <https://github.com/nilenso/honeysql-postgres> | 2017-12-07T19:54:09.000239 | Marcos |
clojurians | clojure | To scan a whole file system (collecting information about file sizes), is recursively applying `.listFiles` the fastest option available to me? I couldn't immediately work out whether it was based on nio2 which seems to be the lowest level option available in Java? Anecdotally my approach seems orders of magnitude slower than, for example, DaisyDisk (I am on a Mac) which appears (although maybe they have some way of deferring the fetching of individual file information for a folder?) to be able to gather the same information in under 30s. -- digging around in the Java I see `java.nio.file.Files#walkFileTree` and I don't think `.listFiles` is using that so I guess I should start digging there. | 2017-12-08T06:50:05.000149 | Kayleigh |
clojurians | clojure | Hello all, how do I convert this?
``` SSHClient ssh = new SSHClient();
ssh.addHostKeyVerifier(
new HostKeyVerifier() {
@Override
public boolean verify(String s, int i, PublicKey publicKey) {
return true;
}
}); ``` | 2017-12-08T07:21:43.000374 | Lois |
clojurians | clojure | <@Lois> `reify` for `new HostKeyVerifier() { ` which seems the only non-straightforward part | 2017-12-08T07:29:40.000281 | Kristy |
clojurians | clojure | how can I do `traverse` in clojure? So I have an array of `[1 2 3 4]` and I’d like to call let’s say `get-user` function, which accepts a user ID and does an http call and then I want to end up with an array of results basically | 2017-12-08T07:34:34.000062 | Tameka |
clojurians | clojure | if I use map, will that hold the computation that happens afterwards, before everything is resolved? | 2017-12-08T07:35:06.000124 | Tameka |
clojurians | clojure | <@Tameka> yes, as long as you realize the computation | 2017-12-08T07:42:34.000038 | Jami |
clojurians | clojure | you could even use <https://clojuredocs.org/clojure.core/pmap> | 2017-12-08T07:42:43.000466 | Jami |
clojurians | clojure | and use doall to ensure you produce the side effect <https://clojuredocs.org/clojure.core/doall> | 2017-12-08T07:43:09.000159 | Jami |
clojurians | clojure | gotcha, thank you! | 2017-12-08T07:43:34.000194 | Tameka |
clojurians | clojure | that’s cool :smile: | 2017-12-08T07:45:23.000400 | Tameka |
clojurians | clojure | Hrmm... even using `hara.io.file.list` which seems to be nio based is glacially slow. I guess apps like DaisyDisk must be using OSX specific apis not available to Java. | 2017-12-08T07:55:35.000120 | Kayleigh |
clojurians | clojure | trying to wrap my head around fully qualified keywords, would the following be a valid way to refer to a spec in another namespace:
```
(ns foo
(:require [clojure.spec :as s]))
(s/def ::layout-string ...)
(ns bar
(:require [clojure.spec :as s]))
(s/fdef parse-layout-string
:args :foo/layout-string
...)
```
? (I ask since I’m getting an interesting ‘Call to clojure.core/ns did not conform to spec’ error) | 2017-12-08T07:58:10.000164 | Joette |
clojurians | clojure | yes, "::" resolves to your current namespace | 2017-12-08T08:00:06.000233 | Jami |
clojurians | clojure | but you should put (:require foo) in ns bar | 2017-12-08T08:00:40.000002 | Jami |
clojurians | clojure | <@Jami> thank you! | 2017-12-08T08:07:17.000003 | Joette |
clojurians | clojure | <@Jami> seems my error was an incompatibility in my dependency chain with clojure 1.9…could be I’m a bit thick here, but I don’t always find those spec error messages entirely easy to grok | 2017-12-08T08:17:42.000221 | Joette |
clojurians | clojure | they certainly take some getting used to | 2017-12-08T08:20:00.000435 | Cecilia |
clojurians | clojure | there is this <https://github.com/bhb/expound> | 2017-12-08T08:20:52.000333 | Cecilia |
clojurians | clojure | you can try to make them more readable with <https://github.com/bhb/expound> | 2017-12-08T08:20:54.000537 | Jami |
clojurians | clojure | <@Cecilia> <@Jami> thanks for the pointer, I’ll take a look at expound | 2017-12-08T08:25:18.000225 | Joette |
clojurians | clojure | problem is this was the clojure compiler complaining about code I didn’t write. Not sure it would be possible to force the clojure internal spec conform calls to use expound… | 2017-12-08T08:26:40.000216 | Joette |
clojurians | clojure | yes it is | 2017-12-08T08:26:57.000187 | Cecilia |
clojurians | clojure | <https://github.com/bhb/expound#explain-out> | 2017-12-08T08:27:23.000135 | Cecilia |
clojurians | clojure | if that is set then spec uses expound to do it’s error printing | 2017-12-08T08:28:08.000242 | Cecilia |
clojurians | clojure | would it be possible to inject this early enough in the build process so that when clojure checks my transitive dependencies, it would use expound/printer? (I’m using leiningen) | 2017-12-08T08:29:33.000321 | Joette |
clojurians | clojure | not sure, haven’t tried it. But you can execute arbitrary code within Leiningen. The problem is though, that if the exception actually does truly happen during dependency resolution then it is kinda too early since spec itself is a dependency | 2017-12-08T08:30:51.000427 | Cecilia |
clojurians | clojure | and so is expound | 2017-12-08T08:30:57.000117 | Cecilia |
clojurians | clojure | I would be super surprised the problem would surface during dependency resolution though | 2017-12-08T08:31:23.000148 | Cecilia |
clojurians | clojure | after dependencies you can execute code via leiningen `:injections`, see example here <https://github.com/technomancy/leiningen/blob/master/sample.project.clj#L182> | 2017-12-08T08:32:02.000474 | Cecilia |
clojurians | clojure | argh | 2017-12-08T08:32:06.000204 | Cecilia |
clojurians | clojure | You could put it in user.clj - thats loaded pretty early | 2017-12-08T08:32:08.000541 | Sonny |
clojurians | clojure | user.clj is another option, that comes later than `:injections` but if that is enough then it would be preferrable. | 2017-12-08T08:33:18.000345 | Cecilia |
clojurians | clojure | I think one of my dependencies was not built to work with clojure 1.9 and fails a few checks when it is, I have solved the issue by upping the dependency to a version which is built for 1.9 so this is somewhat academic for the purposes of my immediate issue, but interesting nevertheless | 2017-12-08T08:33:19.000197 | Joette |
clojurians | clojure | right, well that would not break during dependency resolution | 2017-12-08T08:33:43.000309 | Cecilia |
clojurians | clojure | thank you both for the pointers | 2017-12-08T08:33:44.000418 | Joette |
clojurians | clojure | but more when it gets loaded | 2017-12-08T08:33:49.000187 | Cecilia |
clojurians | clojure | so, you have plenty of time to hook expound as spec error printer | 2017-12-08T08:34:09.000172 | Cecilia |
clojurians | clojure | and here my clojure newbieness shines through a bit. Would not the dependencies be loaded on “first refer” or something, i.e. probably before the code in core.clj etc is executed? | 2017-12-08T08:35:10.000056 | Joette |
clojurians | clojure | if your code is not AOT compiled then dependencies etc are loaded when you require them | 2017-12-08T08:35:43.000293 | Cecilia |
clojurians | clojure | so, if you add the expound hook into user.clj - which is the very first thing Clojure loads - and there only refer spec and expound then you will get that code executed before another piece of code gets executed which will try to require the offending library | 2017-12-08T08:36:45.000148 | Cecilia |
clojurians | clojure | which would normally be in the ns block at the top, so the error printer hooking would have to happen before that at least | 2017-12-08T08:36:46.000002 | Joette |
clojurians | clojure | <@Cecilia> ok, thank you again! | 2017-12-08T08:37:41.000074 | Joette |
clojurians | clojure | np, the dynamic nature of Clojure is really powerful, it has a slight drawback of relatively high startup time but in general it’s benefits far outweigh the downsides | 2017-12-08T08:38:16.000001 | Cecilia |
clojurians | clojure | you pretty much cannot do stuff like that in most of the languages | 2017-12-08T08:38:47.000300 | Cecilia |
clojurians | clojure | It is ok to seek feedback for a library idea here? Its a rather big idea so before releasing anything I and investing too much I want to make sure its not totally wrong!
edit: <https://www.reddit.com/r/Clojure/comments/7if66b/objection_another_component_alternative_is_this_a/>
gh: <https://github.com/riverford/objection> | 2017-12-08T09:13:17.000121 | Elmira |
clojurians | clojure | why wouldn’t it be? :slightly_smiling_face: | 2017-12-08T09:14:14.000684 | Cecilia |
clojurians | clojure | tell us about your idea and we’ll evaluate it | 2017-12-08T09:14:28.000057 | Cecilia |
clojurians | clojure | I might not have time right now but someone will | 2017-12-08T09:14:34.000628 | Cecilia |
clojurians | clojure | I've attached a reddit thread/github link :slightly_smiling_face: | 2017-12-08T09:15:30.000296 | Elmira |
clojurians | clojure | Any comments would be greatly appreciated, just so I know whether to invest in it - I have lots of open-source work that I want to do and want to get a feel for whether its worth the risk on this one (as it seems very risky) | 2017-12-08T09:16:56.000666 | Elmira |
clojurians | clojure | ok, I read the github page | 2017-12-08T09:17:40.000339 | Cecilia |
clojurians | clojure | really doesn’t look that different from mount to me | 2017-12-08T09:18:14.000367 | Cecilia |
clojurians | clojure | for example, the “lazy construction instead of explicit single start! fn.” is not strictly totally true, you can specify which components you want started with mount when you call it’s start! | 2017-12-08T09:18:45.000624 | Cecilia |
clojurians | clojure | I've started a thread. | 2017-12-08T09:19:32.000364 | Elmira |
clojurians | clojure | so, I would say that would look great if there were no mount available, since it is however I do not see any real value I would get out of that | 2017-12-08T09:20:09.000708 | Cecilia |
clojurians | clojure | <@Cecilia> could you paste your stuff here? :slightly_smiling_face: | 2017-12-08T09:20:24.000225 | Elmira |
clojurians | clojure | ah, sorry | 2017-12-08T09:20:37.000276 | Cecilia |
clojurians | clojure | Empperi [4:17 PM]
ok, I read the github page
[4:18]
really doesn’t look that different from mount to me
[4:18]
for example, the “lazy construction instead of explicit single start! fn.” is not strictly totally true, you can specify which components you want started with mount when you call it’s start!
[4:20]
so, I would say that would look great if there were no mount available, since it is however I do not see any real value I would get out of that | 2017-12-08T09:20:50.000064 | Cecilia |
clojurians | clojure | so, I wouldn’t say “don’t do it” but as it is now it doesn’t look compelling enough to me to justify a new library | 2017-12-08T09:21:23.000316 | Cecilia |
clojurians | clojure | I would prefer seeing some PRs in mount to improve it if you find it lacking | 2017-12-08T09:21:37.000464 | Cecilia |
clojurians | clojure | but, I got to go and cannot give you any more relevant feedback. Do not kill your idea based on just what I said :slightly_smiling_face: | 2017-12-08T09:22:49.000390 | Cecilia |
clojurians | clojure | I do not use mount, I have looked at it in the past - in fact a lot of this came out of a lack of satisfaction with mount/integrant/component for certain kinds of system.
I do appreciate 'yet another component/mount/bla' alternative, and one of the main reasons why I am apprehensive. I'll adjust the readme a bit to try and help demonstrate why its different, and where the value prop is of this over the others. Thanks for taking the time to give it a look :slightly_smiling_face: | 2017-12-08T09:24:55.000390 | Elmira |
clojurians | clojure | looks like clojure 1.9 is out :) | 2017-12-08T09:30:37.000004 | Kareen |
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