#clojure – 2016-01-04

2016-01-04

04:58	jonathanj	can i `map` a transducer?
04:59	jonathanj	i have a transducer for filtering out foos (filter foo?), but now i have a nested structure, a list of lists, i'd like to filter out foos from each inner list
04:59	jonathanj	without permanently flattening the structure
05:09	hyPiRion	jonathanj: (map #(filter foo? %))?
05:10	jonathanj	yeah, i guess so but that means i have to have a transducer for foo and just a plain predicate, i was hoping to just compose a bunch of transducers
05:10	jonathanj	i think `eduction` does what i want, but the documentation is so thin i can't really be sure
05:12	hyPiRion	you can probably do it if you generate the nested structure with transducers
05:12	jonathanj	,(sequence (map (partial eduction (filter odd?))) [[0 1] [2 3 4] [5 6 7]])
05:12	clojurebot	((1) (3) (5 7))
05:13	hyPiRion	that's effectively the same as this:
05:13	hyPiRion	(sequence (map #(filter odd? %)) [[0 1] [2 3 4] [5 6 7]])
05:13	jonathanj	for that simple example, what about if i want to layer more transducers?
05:14	jonathanj	i guess it should be the same regardless
05:14	jonathanj	the thing is that in my code i have a transducer instead of (filter odd? xs)
05:14	jonathanj	so it's more like (partial eduction foos)
05:15	hyPiRion	Oh, then eduction is probably fine
05:15	jonathanj	so i can reuse my transducer elsewhere
05:20	jonathanj	mmm
05:23	jonathanj	mmm, except in reality my collection is a list of maps with a key i wish to filter
05:25	jonathanj	specifically, it's a list of maps containing information about pages in a PDF and the key i want to filter is the X-Objects contained by that page, it's not super obvious how i manipulate the data for that key in every map and retain the original structure
05:32	hyPiRion	Could you give an example on how it's laid out?
05:34	jonathanj	[{:page <Page object from Java library> :x-objects [{:x-object <X-Object from Java library> :length 42 ...} ...]} ...]
05:34	jonathanj	what i'm trying to do is keep only certain types of x-objects (i want to remove objects that are not images)
05:35	jonathanj	i'm trying a different approach now though, i'm providing a way for the function that generates the structure to include only the relevant information
05:35	jonathanj	instead of trying to strip it out later
05:35	jonathanj	but i would still be interested to see the solution
05:36	jonathanj	i think what i want is something that behaves like a lens but it's really not clear to me how i make that happen with transducers
05:36	jonathanj	i.e. writing code to "reach in" and transform something while retaining the original structure of all the parent layers seems like a faraway dream to me
05:37	jonathanj	i think i remember reading about some library designed to make this a lot easier but i forget its name
05:37	hyPiRion	(map (fn [x] (update x :x-objects #(filter my-filter %))) my-data) ?
05:38	hyPiRion	or (update-in x [:x-objects] ...) if you're using an old Clojure version
05:39	jonathanj	i think specter is what i was thinking of
05:41	jonathanj	hyPiRion: i was trying to make use of transducers to avoid creating intermediate structures of data i have no use for
05:41	jonathanj	(mostly as an exercise in transducers)
05:42	hyPiRion	Ah
05:42	jonathanj	i think at this point i have a transducer hammer and everything looks like a transducer nail though
05:43	jonathanj	so thanks for knocking some sense into me
05:44	hyPiRion	Well, it's possible I guess, but I don't think it would not be pretty. And I'd assume it's not a performance issue, it's surprisingly rare that actually is an issue.
05:44	hyPiRion	I did some work on recursive transducers (http://hypirion.com/musings/recursive-transducers) and let me say it can get messy quickly
05:44	jonathanj	is there a way to find the index of something in a vector given a pred?
05:44	jonathanj	hyPiRion: yes, it does seem to get messy very quickly
05:46	hyPiRion	(defn indices [pred coll] (keep-indexed #(if (pred %2) %1) coll))
05:48	TEttinger	(reduce #(if (pred %2) (reduced (inc %1)) (inc %1)) 0 coll)
05:48	jonathanj	what is a sorted map?
05:49	jonathanj	is it sorted upon every assoc/update?
05:49	TEttinger	,(let [pred #{4} coll (range)](reduce #(if (pred %2) (reduced %1) (inc %1)) 0 coll))
05:49	clojurebot	4
05:50	TEttinger	,(let [pred #{4} coll (range 0 10 2)](reduce #(if (pred %2) (reduced %1) (inc %1)) 0 coll))
05:50	clojurebot	2
05:50	jonathanj	`reduced` is kind of an amazing thing
05:50	TEttinger	yep
05:50	TEttinger	hyPiRion's is shorter though, probably clearer
05:51	TEttinger	mine gets the first, his gets all
05:51	TEttinger	different uses
05:51	jonathanj	are there restrictions on what one can use as a key in a map in clojure?
05:51	jonathanj	can i use a java object as a key?
05:52	powered	reduced is the break of other languages
05:52	powered	but only for reduce
05:52	jonathanj	kind of
05:52	jonathanj	you can't break a reduce in Python, for example
05:54	jonathanj	thinking about it, i almost never use break in Python since i tend to use the higher level constructs
05:55	jonathanj	except that in Clojure you can :while (for) but in Python you can't break a listcomp
05:56	rivarun	nothing you can't write in a listcomp if you really want to, but no sugar for it
05:58	jonathanj	sure, but suddenly what is a concise form has to turn into a wordy function (that you never really wanted in the first place) just so you can exit early
05:59	jonathanj	it just suddenly struck me as mildly amusing, i'd never really thought about it before
07:53	princeso	what is the magic behind this '{& fn catch try finally try} in the macro doc. Im just WOT¿? https://github.com/clojure/clojure/blob/61bc3523eebaade6a1d856f74330169eb26211ea/src/clj/clojure/repl.clj#L120
07:54	princeso	({& fn catch try finally try} name)
07:57	Bronsa	princeso: it's making (doc catch) (doc finally) use the same docstring as try
07:57	Bronsa	and (doc &) use the docstring for fn
08:01	princeso	Bronsa thx. where to find more docs about? i dont get it. Is it some shortcut?
08:02	MJB47	its just a hash-map
08:02	MJB47	which act as functions
08:02	Bronsa	,('{& fn} '&)
08:02	clojurebot	fn
08:05	princeso	MJB47 Bronsa, ah yes, thx. Im sorry im learning at brute force XD
09:37	jsabeaudry	What happens if I call mult on the same channel twice?
09:47	engblom	If I want to merge two vectors so [1 2 3 4] and [a b c d] becomes [[a 1] [b 2] [c 3] [d 4]], what options do I have beside (for..)? Is there a ready function/macro for that?
09:47	opqdonut	,(map vector [1 2 3 4] [:a :b :c :d])
09:47	clojurebot	([1 :a] [2 :b] [3 :c] [4 :d])
09:48	visof	hi guys
09:48	engblom	opqdonut: Thanks! That surely makes the code shorter than my (for...) alternative
09:51	visof	i'm in situation which i have large csv file with first field sorted number, and i want to query the file by the first field, my approach is to split the files to smaller files and check if the provided number in which file then query the smaller file, is there a better approach than this to solve this problem?, note: i don't want to use in-memory design for the full file, i want memory efficient solution
09:51	visof	can anybody suggest anything?
09:51	mavbozo	happy new year!
09:52	visof	mavbozo: today is 1/04
09:52	domgetter	visof: the best solution is probably to shove it in a relational database, but you want to avoid that, no?
09:54	engblom	visof: I do a lot of similar things in my work.... but there I really think bash scripts are the best tools.
10:03	visof	engblom: i want to make this funcionality inside my code
10:03	visof	domgetter: yeah i want to avoid it
10:30	jsabeaudry	Sanity check: wrapping a reset! in a dosync is pointless, right?
10:31	ridcully_	reset! is for atoms, dosync is for refs
10:33	jsabeaudry	ridcully_, thanks, I'm cleaning some old code and this made no sense to me
10:37	nathanic	et
11:15	matthavener	visof: run through the file once and create a lookup table of 'first field' to 'file offset and length', and then mmap the file
12:20	kungi	Is there a maximum function size in clojure?
12:20	kungi	When I try to evaluate a function I get the funky error: Unknown constant tag 80 in class file
12:20	Bronsa`	there's a hard limit on how much bytecode can be emitted, imposed by the jvm
12:21	Bronsa`	kungi: can you nopaste that function?
12:21	kungi	Bronsa`: yes
12:22	kungi	http://p.nnev.de/8084
12:22	Bronsa`	you're probably exceding the max size for the jvm constant pool
12:22	Bronsa`	don't embed huge strings in code
12:23	kungi	Bronsa`: Ok.
12:23	Bronsa`	save them in a file and read that file
12:24	kungi	Bronsa`: To my defense I have to say: It's not my code :-). Some guy tries to evaluate how far he can adapt my code through my "templates".
12:49	engblom	When looking at this file: http://pastebin.com/J9eCWA3y , what do you think is the best way to check that the first line ends with "YES"? And what would be the best way to get the number from t=number at the end of the second line?
12:50	engblom	Would you use (subs ...)?
12:51	engblom	If I would use subs, I would need to catch StringIndexOutOfBoundsException... Because the line length might vary.
12:52	Bronsa`	engblom: a regex?
12:55	engblom	Bronsa`: How would you use regex to get out only 20750 from "4c 01 55 00 7f ff 0c 10 be t=20750"? The value might vary.
12:57	Bronsa`	engblom: wouldn't #".t=(.)" do?
12:59	devth	,(re-find #"\d+$" "4c 01 55 00 7f ff 0c 10 be t=20750")
12:59	clojurebot	"20750"
12:59	devth	if the value is always numeric
12:59	devth	int to be specific
13:01	engblom	Thanks!
13:08	justin_smith	jonathanj: regarding what you can use as keys - you can use anything as a key in a hash-map, but using a mutable object as a key, then mutating it, will have fun consequences that your code probably isn't ready for
13:09	devth	so...i never got in the habit of using transducers. read all about them a few years ago. are they making anyone else's life better?
13:09	devth	*1.5 yrs or whatever it was
13:10	devth	same with reducers
13:13	justin_smith	devth: they are a performance tweak that helps a bit, and for those people creating things like core.async that have new data sources they are an awesome feature
13:13	devth	makes sense. more appropriate for certain lib authors..
13:14	devth	one thing that almost made me reach for reducers the other day was wanting to perform a map and a filter at the same time.
13:14	devth	which you are essentially doing if you compose reducers, right?
13:15	justin_smith	devth: reducers and transducers are not the same thing
13:15	justin_smith	you compose transducers
13:16	devth	yes i know they are not the same thing :P
13:16	justin_smith	OK, reducers are not a thing you can compose
13:16	devth	ok, got mixed up while reading http://ianrumford.github.io/blog/2013/08/25/some-trivial-examples-of-using-clojure-reducers/ i guess
13:44	engblom	I tried to take use of the -> macro, but failed. Could someone please tell me what I am doing wrong in http://pastebin.com/Xy8KC5AB
13:47	engblom	With that code I am trying to list all files having a filename beginning with "28"
13:47	engblom	It is doing what it should do until line 8 where it fails
13:47	ridcully_	map and filter want the seq last
13:48	engblom	When I had them nested, without -> it worked
13:48	featheredtoast	probably better to use the ->> macro
13:48	featheredtoast	if you're going that route
13:49	justin_smith	(-> "/some/path" File. .listFiles seq (->> (map #(.getName %)) (filter #(= "28" (subs % 0 2)))))
13:49	justin_smith	or just use ->> all throughout I guess
13:49	justin_smith	also, that last check might be better as #(.startsWith % "28")
13:53	engblom	Actually, all the files I want are looking like this: 28-something. For example 28-04146d8243ff. I would want the 04146d8243ff part of all those files.
13:53	justin_smith	engblom: right, I was saying use that as the filter
13:53	justin_smith	instead of subs etc.
13:54	justin_smith	,(filter #(.startsWith % "28") ["28hi" "no" "a" "28done"])
13:54	clojurebot	("28hi" "28done")
13:54	engblom	Thanks
13:54	justin_smith	engblom: also, with your existing filter lambda, you would get an error with a one character file name
13:55	justin_smith	(not that this is likely, but just so you know)
13:57	engblom	Ok, now it is outputting a list looking like this: ("28-04146d54e7ff" "28-04146d8243ff")
13:57	engblom	How would you remove the "28-" part from each, knowing that in worst case the list is empty?
13:58	justin_smith	,(clojure.string/replace "28-foo" "28-" "")
13:58	clojurebot	"foo"
13:59	justin_smith	or, if it is guaratneed that all start with 28- #(subs % 3)
13:59	engblom	justin_smith: So another map?
13:59	justin_smith	engblom: right
13:59	ridcully_	if you filter for 28- you can savely remove it. if you have concerns about a `28-` file leaving you with an empty name, you can either use a regexp to filter or just use that file
13:59	justin_smith	,(subs "28-foo" 3)
13:59	clojurebot	"foo"
13:59	engblom	justin_smith: It is pretty much sure all begins with 28 as we already filtered out only those
13:59	justin_smith	right, right
14:01	engblom	Thanks!
14:02	justin_smith	you could replace the two maps with one keep (keep #(when (.startsWith % "28-") (subs % 3)))
14:03	justin_smith	the when returns nil for non-matches, and those are removed by keep
14:26	engblom	I have a list (key1 key2 key3) and a function f. Now I would want to create a map {key1 (f key1) key2 (f key2) key3 (f key3)}. The value is always what you get when you run f on the key. Is there a ready function for that, or do I need to create one myself?
14:27	justin_smith	(zipmap key-list (map f key-list))
14:27	justin_smith	or (into {} (map (juxt identity f) key-list))
14:28	justin_smith	or (into {} (map (juxt identity f)) key-list)
14:28	justin_smith	I like the last one best
14:32	engblom	Thanks!
14:43	engblom	Now I have a pretty useful GPIO library for Raspberry Pi: https://github.com/engblom/gpio
14:43	justin_smith	cool
14:43	justin_smith	engblom: glad you didn't give up when that other one didn't work out
14:44	engblom	I know I am not experienced with Clojure, so if anyone got interrest to improve on it, feel free to do so. I might learn something from that too :)
14:55	kungi	engblom: how does defn ^:private differ from defn-?
14:59	souterrain	engblom: I'm learning clojure, and now I'll have to dust off the RPi as well. Thanks. :)
15:06	noncom\|2	did anyone had a chance to install a fresh emacs with prelude recently?
15:19	engblom	kungi: It is the same as far as I understand.
15:20	engblom	souterrain: Yes, please do that! I am happy for as much testing as possible of this library.
15:21	engblom	souterrain: I think this library should make GPIO programming very simple. It will work as normal unprivileged user.
15:22	engblom	souterrain: I have tested it with the Jessie version of Raspbian, which added the gpio user group.
15:23	noncom\|2	recently i installed a freshnew emacs and with prelude and it hangs on loading
15:23	noncom\|2	it eats 1 core of CPU and all RAM it can get, doing nothing on the stage where prelude should draw its packages
15:23	noncom\|2	...
15:23	noncom\|2	what do i do?
15:24	justin_smith	noncom\|2: have you tried the -debug-init flag?
15:24	justin_smith	noncom\|2: another option is to start "emacs -q" (load no user init), then run each line of your .emacs one at a time in the ielm console
15:25	justin_smith	then you can see which one hangs (and see verbose output as each step runs)
15:26	justin_smith	noncom\|2: or, instead of ielm, you can just open your .emacs and use C-M-x to run each line of your .emacs one at a time
15:26	noncom\|2	justin_smith: just tried the -debug-init flag.. does not change anything.. emacs starts in its bare configuration, tries contacting melpa on behalf of prelude and hangs..
15:27	noncom\|2	i don't actually ahve any customization in init.el at all, it all comes from prelude
15:27	noncom\|2	its a fresh one
15:27	noncom\|2	would that mean that prelude installation is broken now?
15:27	noncom\|2	i can try to run it an instruction-by-instruction..
15:27	justin_smith	noncom\|2: until melpa is available, sounds like it...
15:27	justin_smith	noncom\|2: yeah, my suggestion would end up leading ot debugging what broke about prelude
15:28	justin_smith	but it sounds like you already know connecting ot melpa is the part that is broken
15:28	sdegutis	Are all Clojure libraries, and Clojure itself, and third party libraries, known to work well with Java JDK 8?
15:28	noncom\|2	justin_smith: well, at least, its the last text that remains in the status line when it hangs
15:28	kwladyka	cfleming i heard you can say something about add rum macros like rum/defc rum/defcs and < to curisve in intellij? I want make show parameters, jump to source, refactoring etc. work for https://github.com/tonsky/rum
15:28	engblom	sdegutis: I have not had any problem at least, but that does not neccessary mean much as I have only used a fraction.
15:29	justin_smith	sdegutis: I would hesitate to make any assertion about "all third party libraries". There are definitely at least some third party libs that will break with jdk 8, I'm sure of it. How many? hopefully very few.
15:29	justin_smith	sdegutis: I've had no problems using jdk8 for a large project with many deps
15:30	sdegutis	justin_smith: so then do most people use JDK 1.7 rather?
15:30	justin_smith	sdegutis: why would jdk8 be more likely to break something than 7 would? clojure says it will work with 6+
15:30	justin_smith	in my experience it works great with 6,7, or 8
15:31	sdegutis	Cool.
15:31	justin_smith	I'm just saying, third party libs break in weird ways, and there are a lot of them. But the good ones work with 8, in my experience so far.
15:31	engblom	The library I just wrote will not work with jdk1.6...
15:31	sdegutis	I upgraded to JDK 1.8 a few weeks ago and my server stopped sending emails (it seemed that it no longer could send them) via AWS JDK SES.
15:31	engblom	1.7 added the WatchService
15:32	justin_smith	sdegutis: is aws using 1.8?
15:32	justin_smith	sdegutis: the one gotcha I can think of is if you were using javac locally with 1.8 and targetting the wrong version
15:33	sdegutis	hmm
15:33	justin_smith	or a random 1.8 bug that you found, I guess?
15:33	sdegutis	maybe
15:34	sdegutis	looking into it today (first day back at work)
15:38	noncom\|2	there is (defvar prelude-dir (file-name-directory load-file-name) "comment") at the very beginning, C-x C-e it gives "Wrong type argument: stringp, nil" and everywhere further, prelude-dir == nil. is this okay or does it look like a problem?
15:39	noncom\|2	this being nil ruins all other dir inits furhter down..
15:39	noncom\|2	but idk if it's the same with the real work, as with C-x C-e
15:40	justin_smith	that expression should return the directory the file is in, but if loading line by line it might not
15:40	justin_smith	you might need to do an explicit set with M-x :
15:40	justin_smith	you can also use M-x : (or an IELM repl buffer) to check the value of prelude-dir, make sure it is set, etc.
15:44	noncom\|2	justin_smith: umm it's still always nil.. even if i do : http://joxi.ru/1A5b5BZFKzkEVr and C-x C-e it separately
15:44	noncom\|2	there, at the next line where it should be used, it is nil..
15:45	noncom\|2	eh.. i guess finding what's the problem with emacs will be a real quest
15:45	justin_smith	noncom\|2: defvar is like defonce
15:45	noncom\|2	ah
15:45	justin_smith	you need to use setq instead to explicitly set the var
15:45	justin_smith	(only while debugging, of course)
15:45	justin_smith	welcome to the magical world of elisp!
15:45	noncom\|2	oh, that really worked!
15:45	noncom\|2	ehehe))
15:48	noncom\|2	justin_smith: yes, found the line, err: http://joxi.ru/KAgKZaYugNe3kA
15:48	justin_smith	noncom\|2: and that is just like clojure require, it looks for the prelude-packages.el file, and the error will be somewhere in there
15:49	noncom\|2	yeah
16:08	spieden	anyone using devcards with reagent? can't find versions of both that work together
16:08	jonathanj	justin_smith: cool, i have no intention of mutating it
16:11	noncom\|2	justin_smith: heh: http://joxi.ru/BA0d9E6uBvwXnA
16:13	noncom\|2	i don't know what could be wrong with it
16:14	noncom\|2	simply the package download hangs
16:14	noncom\|2	but not just hangs - it wastes a lot of cpu and memory..
16:14	noncom\|2	and it never happened before. afaik there were no changes to emacs and prelude since it worked the last time
16:14	noncom\|2	:/
16:14	justin_smith	noncom\|2: is that host available?
16:16	noncom\|2	justin_smith: this one: https://melpa.org/packages/ yes, looks like it is online
16:17	noncom\|2	anyway, what a terrible error must be to cause this type of hang..
16:20	noncom\|2	damn this is a blocker... i'll have to reside to some sublime text..
17:18	pilne	hrm.. is the reason it is so easy to call frege functions from clojure because frege compiles first to java source and then lets javac compile it down to java bytecode?
17:19	hiredman	clojure interop with other jvm langauges is via the jvm
17:19	hiredman	the jvm provides types and an object model
17:41	pilne	yeah, but when i mentioned calling scala from clojure, i was told it can be difficult due to the way scala handles things, frege seems to compile down to "plain" java, which is what i assume makes it easy to call it?
17:45	TEttinger	pilne: from what I understand, frege does seem to compile down to some approximation of ordinary java.
17:45	hiredman	my understanding is frege's runtime is more, maybe 'reified' is the right word, so the semantics sort of match the generated code, where scala's compiler is more sophisticated
17:45	TEttinger	this is hello world http://lpaste.net/148367
17:45	TEttinger	(compiled to java)
17:46	TEttinger	there's no defined frege fns there, so I'm not sure how they are callable (I could ask my friend who made it to compile a defn example)
17:46	hiredman	a more sophisticaed compiler, through transforms and optimizations what have you, can result in code that has the semantics of the input language, but looks way different
17:48	pilne	interesting
17:50	pilne	this is the kinda shit that really interests me and gets my brain churning... i need a way to hack on things productively on my phone so i can burn downtime at work productively to gain more time hacking code >.< lol
20:01	souterrain	engblom: which JRE are you using on RPi? Just curious whether there are performance issues, or if there is a better one to choose on a small system like that.
20:19	justin_smith	souterrain: I've had good luck with the vm that comes with raspian (sun jdk 8)
20:38	TEttinger	I'm curious if Avian can run Clojure now with something less than the heavyweight OpenJDK class library
20:50	justin_smith	TEttinger: even if it was possible, it would also require people not use non-avian stuff via interop, right?
20:50	TEttinger	mmm
20:54	souterrain	justin_smith: ok, thanks. I'll stick with what raspian comes with then.
21:29	mikerod	are Java type hints safe to leave in cljs code?
21:29	mikerod	meaning does the compiler allow it
21:29	mikerod	or do you need to reader-conditional it out etc
21:30	mikerod	for some reason I haven't been able to find a definite answer to this - I'm just not sure what is the "best practice" there
21:39	banjiewen	I'm running in to a strange issue with static methods in a gen-class and return type casts: https://gist.github.com/banjiewen/cc0a03e16e5880ed60bd
21:39	banjiewen	In short, "ClassCastException rat.fish.RatFish cannot be cast to rat.fish.RatFish" doesn't make much sense to me.
21:39	banjiewen	Guessing I'm lacking some sort of interop understanding
21:41	banjiewen	Any suggestions would be greatly appreciated.
21:45	mikerod	@banjiewen I think I don't see enough info here to try to diagnose the issue
21:46	mikerod	or I don't understand all the tricky details about gen-class
21:46	mikerod	it sort of sounds to me like you have multiple instances of the same class from conflicting class loaders
21:46	banjiewen	mikerod: RatFish is a pretty straightforward `defrecord` in ns rat.fish
21:47	mikerod	perhaps you have an AOT-compile-loaded RatFish in the AppClassLoader and then you have a 2nd version of this RatFish from a Clojure DynamicClassLoader due to the :require
21:47	mikerod	I can't immediately think of any related Jiras or anything to this and I cannot see how you could be doing something wrong here really
21:50	banjiewen	Thanks for taking a look, anyway.
21:51	justin_smith	banjiewen: this happens because of reloaded code
21:51	banjiewen	There's no way to stick a static method on a defrecord'd class, is there?
21:51	justin_smith	banjiewen: the old object is not an instance of the new definition
21:51	justin_smith	banjiewen: yes, there is
21:51	justin_smith	oh wait, not statics
21:51	justin_smith	n/m
21:52	banjiewen	justin_smith: I'll try with a clean environment to see
21:52	justin_smith	banjiewen: you might need to run lein clean before starting a new repl
21:52	banjiewen	kk
22:03	mikerod	banjiewen: I'd like to see the series of steps you take
22:03	mikerod	to build the project and then run your repl
22:04	mikerod	it does seem like you're managing to get Clojure's DynamicClassLoader to load up a RatFish class instance after your AOT-compiled code has already loaded a RatFish class instance with another loader - probably your system dependent "AppClassLoader"
22:04	mikerod	or "jvm dependent" I guess
22:05	banjiewen	mikerod: Looks like justin_smith was right about the environment - too much cruft lying around. `lein clean` followed by some fixup on my project.clj cleared up the issue.
22:05	banjiewen	Thanks both.
22:05	mikerod	haha good
22:05	mikerod	that makes it simple then
22:06	justin_smith	alias wat lein clean
22:06	justin_smith	heh
22:06	mikerod	AOT-compiled code is often a quick way to get in scenarios where you see MyClass cannot be cast to MyClass
23:05	jeaye	How could I make this work: (update-in {:foo {:bar [1 2 3 4 5 6]}} [:foo :bar] remove even?)
23:05	justin_smith	,(update-in {:foo {:bar [1 2 3 4 5 6]}} [:foo :bar] (partial remove even?))
23:05	clojurebot	{:foo {:bar (1 3 5)}}
23:06	jeaye	,(update-in {:foo {:bar [1 2 3 4 5 6]}} [:foo :bar] #(remove even? %))
23:06	clojurebot	{:foo {:bar (1 3 5)}}
23:06	jeaye	justin_smith: Ah, beat me to it.
23:06	jeaye	Thanks.
23:07	justin_smith	np - you almost had the answer already, clearly
23:07	justin_smith	jeaye: also, if you have flip (update-in m (flip remove) even?)
23:07	jeaye	,(doc flip)
23:07	clojurebot	I don't understand.
23:07	justin_smith	err, forgot the kvec but I think you get the idea
23:08	jeaye	Where does flip live?
23:08	justin_smith	jeaye: flip is a function available in a few util libs that returns a new function taking the same number of args, in the opposite order
23:08	jeaye	Ah. I don't have it.
23:08	justin_smith	I think there is a version of flip in flatland/useful and also in prismatic/plumbing
23:08	justin_smith	also it is an easy function to write
23:09	justin_smith	,(defn flip [f] (fn [& args] (apply f (reverse args))))
23:09	clojurebot	#'sandbox/flip
23:09	jeaye	No problem. I'll leave it as-is for now.
23:09	justin_smith	,(update-in {:foo {:bar [1 2 3 4 5 6]}} [:foo :bar] (flip remove) even?)
23:09	clojurebot	{:foo {:bar (1 3 5)}}