#clojure – 2015-09-06

2015-09-06

00:09	justin_smith	TEttinger: fascinating
00:10	justin_smith	TEttinger: always interesting to see another attempt at manual memory management in a lisp, I'll have to check out how this one approaches it
06:39	skeuomorf	lazy question, is there a way when in smartparens-strict-mode to delete a single paren but not the pair?
06:39	ska-fan	Is (zipmap (map :build-id builds) builds) idiomatic?
06:42	ashwink005	is there a limit to the size of mysql database columns that one can make?
06:46	Rurik	ashwink005, #mysql would know better
06:47	oddcully	ska-fan: looks fine to me - if your build-id is always set and unique. otherwise maybe group-by is an option
06:49	ska-fan	oddcully: Thanks. I just thought a terser way might be possible - build is mentioned twice.
06:49	ashwink005	Rurik: resolved it. Turns out you can't have a column named :desc in mysql
06:50	Rurik	I guess that is because DESC is a keyword in SQL?
06:50	wasamasa	wat
07:00	tim_	(def app-state (atom {:expanded-rows #{124}})
07:01	tim_	how do I add to expanded-rows with swap ?
07:02	oddcully	,(let [a (atom {:x #{1}})] (swap! a update-in [:x] conj 2))
07:03	clojurebot	{:x #{1 2}}
07:09	Rurik	user=> inc
07:09	Rurik	#<core$inc clojure.core$inc@7fab2b22>
07:10	Rurik	What does this mean
07:11	wasamasa	that's how a function is represented in clojure
07:12	tim_	oddcully: thank you
07:12	Rurik	yeah, but what does this strange sentence mean
07:12	Rurik	I'm assuming @7fab2b22 is the memory address
07:12	tim_	I think its just a string representation of the function's location in memory
07:14	tim_	well, its unique id anyway - but I guess you want more detail than that - I'll leave to someone who knows what they are talking about
07:14	muhuk	Rurik: use (doc inc) if you want user readable info on a function.
07:15	Rurik	no, I want to know what this information means
07:17	wasamasa	generated java names for the method I guess
07:27	oddcully	,(pr inc)
07:27	clojurebot	#object[clojure.core$inc 0x4c3a535c "clojure.core$inc@4c3a535c"]
08:49	ashwink005	how do I set default values in a JDBC connected mysql database?
08:53	ashwink005	helloo?
08:55	vak	hi all
08:57	vak	There is an interesting post http://swannodette.github.io/2013/08/02/100000-processes/ and i am trying to reproduce it. But this namespace isn't found: (require ... [blog.utils.dom :refer [by-id set-html! set-class!]])
08:58	vak	could i somehow get the stuff for this namespace via lein? or I'd rather have to find similar functions somewhere else?
09:10	triss	so any of you doing any sort of literate programming? Is Marginalia your tool of choice?
09:20	vak	I did a lot of literate programming, but in R/Sweave
09:31	triss	vak: that sounds very cool. More aimed at producing finished docs than documenting systems though is it on first glance? Can we do similar in clj yet?
09:32	vak	triss: literate programming is very cool in (science) research.
09:33	vak	triss: in pure/generic IT it is not that requested IMHO
09:34	muhuk	vak: precisely. Because you often have overriding priorities.
09:34	triss	Agreed.
09:35	triss	I'm going back in to academia tho....
09:35	triss	and I really like what he process of getting nice documentation ready for code does to my code.
09:37	triss	This seems to be true for me: "The quality of the prose in your documentation will often reflect the quality of the code itself thus highlighting problem areas. The elimination of problem areas will solidify your code and its accompanying prose. Marginalia provides a virtuous circle spiraling inward toward maximal code quality."
09:37	triss	stil believe code should be as self documenting as possible though
09:40	vak	triss: even in science you'll get a lot of colleagues that are borred of literate programming approaches. Albeit many of them will complain on non-reproducible results and lack of possibility "re-create the whole paper after a small fix in labor data"
09:41	vak	triss: the life is funny thing)
09:48	crocket	Can I insert a clojure plugin into lazybot?
10:00	sobel	code is not self documenting. code does what code does, and intentions are sometimes correlated with intuitive idioms, but that's not a reliable documentation method
10:00	sobel	some words about the actual domain and intention of code can save so much time for a reader
10:00	clojurebot	Titim gan éirí ort.
10:01	sobel	reader
10:01	sobel	(what triggered that?)
10:04	muhuk	How do you implement queries in Onyx?
10:05	muhuk	How would you aggreage from multiple tasks?
10:05	crocket	Ala
10:06	muhuk	(or is it just intended for commands - in a CQRS sense)
10:40	Rurik	Why do fn and let take a vector of args/bindings
10:43	justin_smith	Rurik: the thought was to make parens less overloaded
10:44	justin_smith	they do a lot of different things in most lisps, but Hickey wanted to use other delimeters to make it easier to differentiate things
10:44	Rurik	ah, nice
10:45	Rurik	I always kinda got confused by the system scheme used
10:58	kwladyka	justin_smith, do you know place where they looking Clojure Junior?
10:58	justin_smith	no, I don't
10:58	kwladyka	you was my last hope ;)
10:59	kwladyka	I really try, but it is much harder then i thought to be a Clojurian :)
11:00	kwladyka	even many people say Clojure is death technology and it doesn't make sense etc. I don't know history of Clojure but way many people don't like Clojure?
11:01	kwladyka	All love Scala, but Clojure is evil. What is the point?
11:01	Rurik	I don't think that is true...
11:03	kwladyka	me too, but many people think bad about Clojure. I don't know how it look in USA or on West but in my Country and around it is not easy.
11:04	scottj	kwladyka: 99% of programmers don't know enough about clojure to have a worthwhile opinion about it.
11:06	kwladyka	scottj, but it shapes the labor market (i am not sure it is correct in english :) )
11:07	kwladyka	i like so much Clojure... and just can't find a job in this language :) I found one company but they just starting make a Clojure team and hire 1 person for now :)
11:12	engblom	kwladyka: To me it looks like neither Clojure nor Scala gets much love in the job market.
11:13	Rurik	Isn't loop recur exactly like a while loop?
11:16	muhuk	Rurik: a while loop is a loop-recur.
11:17	Rurik	muhuk, so loop-recur goes beyond what a while loop can do?
11:18	muhuk	Rurik: why, yes.
11:19	justin_smith	Rurik: the difference is that loop can create new bindings each time
11:19	justin_smith	which is very helpful when your data is immutable
11:20	Rurik	gotcha
11:22	tomjack	when you say "while loop" do you mean a (while ...) in clojure or maybe a while loop in some imperative language?
11:36	ashwink005	how can I check what request have I fired to mysql server?
11:36	ashwink005	can I log that in repl
11:36	Rurik	tomjack, imperative
11:37	Rurik	ashwink005, I guess you can use do to print a message in the repl the moment you execute the fn
11:38	ashwink005	Rurik: I have done that. When I execute the command in mysql command line I get a result
11:38	ashwink005	Rurik: but repl gives the result as nil
11:38	ashwink005	for the same command.
11:38	ashwink005	the difference being, in repl I use WHERE X=? then pass parameters
11:39	ashwink005	while in mysql I do WHERE X=5
11:43	ashwink005	anyone...?
11:51	justin_smith	ashwink005: can you share a paste of your repl interaction?
11:51	justin_smith	ashwink005: I think this could have to do with how you are using the return value
11:52	ashwink005	hello-compojure.database.db> (getFilteredOffers ["delhi"] nil nil nil nil nil nil nil nil nil nil) SELECT * FROM OFFERS WHERE budgetmin>=? AND budgetmax<=? AND year>=? AND mileage<=? AND owner<=? AND (INSTR(city,"delhi")>0) nil
11:52	ashwink005	SELECT... is the print
11:53	ashwink005	nil is the output
11:53	justin_smith	and where are you privoding any numeric parameters there?
11:54	justin_smith	can you use refheap.com to show us the code of getFilteredOffers?
11:55	ashwink005	justin_smith: after this statement I add all 5 parameters
11:55	ashwink005	in the vector
11:56	ashwink005	the same query in mysql command prompt with parameters attached inline gives a row output
11:56	justin_smith	what vector? I can't tell you what's wrong without seeing the actual code you use with jdbc
11:58	ashwink005	justin_smith: http://txt.do/ac9el
11:59	justin_smith	ashwink005: the key to with-query-results is you have to do something with res
11:59	ashwink005	justin_smith: create multi query just makes a bunch of INSTR(column,value) statements and appends with an OR
12:00	ashwink005	justin_smith: oooohh myyyy effin gaawd
12:00	justin_smith	ashwink005: you provide no body to with-query results, so the block returns the same thing (do) does - nothing because no code
12:00	justin_smith	ashwink005: this is why I asked to see your code :)
12:00	ashwink005	justin_smith: I'm so sorry.. thats a rookie mistake!
12:00	ashwink005	justin_smith: thanks man :) alot! and sorry
12:00	justin_smith	ashwink005: every question on this channel is somebodies rookies mistake, it's all good :)
12:01	ashwink005	justin_smith: hee hee thanks :)
12:35	kavkaz	Is ({:somekey :someotherkey} :somekey) faster than (first '(:somekey :somekey2))?
12:38	justin_smith	kavkaz: they are not even doing comparable things, but no, it should be a little slower
12:39	justin_smith	you've got two different kinds of data structures there of course
12:43	kavkaz	justin_smith: I see. I'm just trying to figure out a better data structure for my algorithm, or perhaps I just haven't thought of the right way of doing it
12:43	kavkaz	I think my logic is all there though
12:43	justin_smith	kavkaz: do you need associative lookup?
12:43	justin_smith	do you need ordered storage?
12:44	kavkaz	justin_smith: I need associative lookup more than anything. I'm making a lazy sequence of primes, something is slowing it down though and I'm trying to figure out what
12:45	justin_smith	OK, because '(:somekey :somekey2) is not associative - it might be efficient as eg. a stack, but not for looking anything up
12:48	justin_smith	kavkaz: with numeric stuff, I would be sure to turn on warn-on-reflection and warn-on-boxing
12:53	kavkaz	justin_smith: Oh thanks! I'll have to look up what those things are but perhaps it'll help me (:
12:58	justin_smith	kavkaz: :global-vars {warn-on-reflection true unchecked-math :warn-on-boxed}
12:58	justin_smith	(those are the options for project.clj)
12:59	kavkaz	Thanks, I was just putting :warn-on-boxed in project.clj and was wondering why it wasn't working
13:02	kavkaz	Maybe I have too much branching going on
13:19	kavkaz	justin_smith: I figured it out, it had nothing to do with boxed math, reflection or branching. In my lazy sequence of primes I was iterating +1 starting from 2
13:19	kavkaz	Where I should have been iterating +2 starting from 3
13:20	kavkaz	Literally cut my time in half
13:20	justin_smith	kavkaz: nice!
13:20	justin_smith	though eliminating boxing or reflection will make big differences too (if there are places to eliminate it)
13:22	kavkaz	justin_smith: For sure. I'm still not 100% sure what reflection is, but I would prefer to keep boxed math in case I'm going to try and compute huge primes
13:23	justin_smith	kavkaz: if the numbers get large enough you can auto-promote, that's not incompatible with unboxed computations when you are low enough
13:23	kavkaz	Ah
13:24	justin_smith	reflection is when the compiler has no way to know which actual class is being provided, so it needs to emit code that figures out which math operations to actually invoke at runtime
13:24	kavkaz	I'll look into that. I'm probably going to refactor my code, then make a blog post on the whoe experience
13:24	justin_smith	you can literally make code 100x faster by eliminating reflection in a bottleneck
13:24	kavkaz	Hmmm
13:24	justin_smith	(in some cases :))
13:25	kavkaz	justin_smith: I see. I'm only working with a map and BigInteger
13:25	justin_smith	kavkaz: does the compiler know this?
13:25	kavkaz	Oh and I guess lazy-seq creates an object
13:25	kavkaz	justin_smith: No, I'm not sure how to specify these things for the clojure compiler
13:26	kavkaz	or JVM that is
13:26	kavkaz	or Java compiler, idk lol
13:26	justin_smith	kavkaz: type hints, if needed. First you need to turn on reflection warnings, then provide hints to eliminate the warnings.
13:26	justin_smith	clojure does not use the java compiler, it's the clojure compiler that needs to figure out if you need runtime reflection or not
13:27	justin_smith	kavkaz: type hints are done via metadata
13:28	kavkaz	justin_smith: Ah I see. I'll refactor my code and then I'll play around with that
13:28	kavkaz	thanks for all the advice btw
13:29	justin_smith	np
14:35	ashwink005	can I distribute my hashmap into 2 seperate vectors one containing keys and one containing values?
14:35	ashwink005	like { :x 2 :y 3} to [:x :y] [2 3]
14:36	amalloy	do you know how to get the keys of a map? or to get the values of a map?
14:37	ashwink005	amalloy: umm no
14:37	AeroNotix	ashwink005: ((juxt keys vals) map)
14:37	ashwink005	AeroNotix: thats a typo or its actually juxt?
14:37	lokien_	Hello my friends! Have anyone here used Clojure for gamedev?
14:39	ashwink005	amalloy: how do I get just the values?
14:47	ashwink005	does anyone know how to get all the values in a Hashmap?
14:47	ashwink005	google ain't helping
14:48	luma	,(vals {:x 2, :y 3})
14:48	clojurebot	(2 3)
14:48	luma	,(keys {:x 2, :y 3})
14:48	clojurebot	(:x :y)
14:49	ecelis	ashwink005: vals
14:49	ecelis	^^ luma did a better job
14:49	ashwink005	ecelis: thanks!
14:49	ashwink005	luma: thanks
14:49	ashwink005	wonder why google can't show shit
14:50	Rurik	ashwink005, conj.io
14:50	ecelis	ashwink005: may I suggest keeping this link under your pilow
14:50	ecelis	?
14:50	ecelis	http://clojure.org/cheatsheet
14:50	amalloy	an interesting alternate solution: ##(apply map vector {:x 2 :y 3})
14:50	lazybot	⇒ ([:y :x] [3 2])
14:51	ashwink005	amalloy: naah don't want a list
14:51	ashwink005	Rurik: Whoa! nice link!
14:52	ashwink005	thanks all!
15:03	rhg135	mapv
15:17	nooga	I'm writing a fairly standard android app with gradle and everything, I wanted to write some logic in clojure - is it even possible to include AOTed uberjar in android app?
15:18	nooga	anyone tried?
15:21	rhg135	Should be
15:21	rhg135	Maven jars are usually byte code
15:25	linuxlite1983	hello
15:28	nooga	my only problem is that I know nothing about java, maven and gradle :D
15:28	amalloy	in fairness, neither do many people who use java, maven, and gradle
15:31	nooga	amalloy: +100
15:31	nooga	:D
15:48	rhg135	So true
15:57	nooga	hah, apparently dexopt fails when I put my jar in deps and try to install the app
16:04	nooga	yeah
16:04	nooga	I imagined that it won't be so easy
16:09	rhg135	You might need to look into multidex
16:11	superfunc	is there a way to evaluate an expression in a branch of a match statement ala match [(inc x)] [(inc someOtherNumber)] ?
16:12	amalloy	evaluating expressions is basically the only thing you can do in match branches
16:14	amalloy	although the example you've written is incomprehensible to me. what do you wish that did?
16:16	superfunc	I was playing around with the play-clj tut. Essentially, I wanted to match on key input and branch on the different possibilities. Like: match [(:key screen)] [(key-code :dpad-up)] (... do something about it)
16:16	nooga	nope, fighting Dalvik is too much for me I think :F
16:16	superfunc	if I throw those up into a let expr, then its no problem
16:16	superfunc	I was just hoping to write them inline
16:52	nooga	HA take that! It somehow worked
16:54	nooga	and of course it was Lollipop bug
16:58	ashwink005_	hey if I take the :cookies keyword's value from my request, do I get a hashmap or a json?
16:58	ashwink005_	can't test
16:59	justin_smith	ashwink005_: it would depend on your middleware, it could be the raw data as bytes, the data slurped into a string, or the data parsed and put into key value pairs in a hash map
17:01	ashwink005_	justin_smith: I'm using wrap-defaults
17:01	ashwink005_	that good?
17:03	ashwink005_	wait found it wrap-cookies middleware
17:04	felipedvorak	Does anybody know of a list of best packages to work with Clojure besides cider?
17:06	justin_smith	ashwink005_ yeah, if wrap-cookies is being used, you should be getting a hash map. But you can also find out what is in your request by using prn (which is like println but shows data types more clearly) or by printing (type (:cookies request)) for example
17:07	Mohikaner	exit
17:07	justin_smith	ashwink005_: another trick I have used is saving the request in an atom so I can use it from the repl
17:07	TEttinger	felipedvorak: clojure toolbox IIRC has a good list
17:08	ashwink005_	justin_smith: yeah I know about destructuring, but right now I can't access any cookies. Dev mode.
17:08	ashwink005_	when I deploy it then maybe I'll test it out
17:08	justin_smith	I don't get it?
17:08	justin_smith	you can use cookies locally
17:08	TEttinger	http://www.clojure-toolbox.com/
17:09	felipedvorak	TEttinger: thanks, what do you use?
17:10	nooga	felipedvorak: clj-refactor is awesome
17:10	TEttinger	I develop clojure with IntelliJ and Cursive
17:10	TEttinger	(I am not a clojure language developer, I mean I use it)
17:11	justin_smith	TEttinger: what is your take on IntelliJ's new licensing?
17:11	TEttinger	I also work on a lazybot fork but I just use jEdit to edit it (not recommended)
17:11	nooga	felipedvorak: I basically got emacs-live from the overtone people and it works for me when it comes to general development
17:11	TEttinger	justin_smith: ?
17:11	ashwink005_	yeah but I'll have to set them. I only want to get cookies.
17:11	TEttinger	don't know about it, justin_smith
17:11	felipedvorak	nooga: thanks
17:12	TEttinger	justin_smith: I'm using IntelliJ IDEA Community 14.1.4
17:12	felipedvorak	nooga: I'm desperate to find a way to have better font-locking for clojure but it seems its a lot harder than I thought and there aren't any packages to improve on clojure-mode
17:13	justin_smith	TEttinger: they are moving to a pay as you go "cloud" app, similar to adobe's model for photoshop
17:13	justin_smith	TEttinger: community edition may not be effected by this
17:13	TEttinger	huh is that for Cursive too?
17:13	TEttinger	I literally only develop open source stuff
17:13	nooga	felipedvorak: no idea, I'm quite content with emacs-live - I did some changes though
17:13	justin_smith	TEttinger: well, Cursive is a separate product, but one you can't do a lot with without IntelliJ
17:14	justin_smith	I hope this new payment / pricing model doesn't fuck with cursive :(
17:14	justin_smith	TEttinger: which is why I asked, I hoped you might have better info about the implications of the new pricing
17:14	TEttinger	I hadn't heard of it
17:15	TEttinger	I'd probably just stick with an older version if I had to pay
17:15	justin_smith	TEttinger: yeah, I dunno if old versions will stop working without subscription payments, or if it's only a new thing for future versions...
17:16	felipedvorak	nooga: never heard of emacs live but it looks very interesting
17:16	TEttinger	justin_smith: since I'm using community, I doubt they can make it stop working remotely?
17:16	justin_smith	TEttinger: https://www.jetbrains.com/idea/buy/
17:17	justin_smith	TEttinger: that's probably true, this probably only effects the pro versions
17:17	justin_smith	TEttinger: https://www.jetbrains.com/buy/opensource/?product=idea
17:18	justin_smith	even the open source licenses are 1 year with yearly renewal
17:18	TEttinger	https://github.com/JetBrains/intellij-community
17:19	justin_smith	aha, so you are probably safe using that one
17:19	TEttinger	justin_smith: do you uh use IntelliJ Community?
17:19	justin_smith	TEttinger: I'm a big fan of cursive and I really want a fully featured tool like that to exist, but I just bang on parens with a rock like a cave man
17:20	justin_smith	which is to say I use emacs but not cider, and run repls in vanilla terminals manually reloading code with require
17:20	TEttinger	there's a weird thing with "open source development only" pro version of intellij, closed-source IDE... and "open source development only" community version of intellij, open source IDE
17:20	justin_smith	~justin_smith bangs on parens with a rock, like a cave man.
17:20	clojurebot	Excuse me?
17:20	justin_smith	:P
17:20	justin_smith	TEttinger: that is weird
17:30	nooga	justin_smith: why not cider?
17:31	justin_smith	nooga: I break it too easily
17:31	justin_smith	I'm probably not smart enough to use cider effectively, I just end up wasting my time with deleting byte code and debugging my tooling and wondering why my editor is freezing up.
17:32	nooga	for me, usually M-x cider-interrupt / M-x cider-restart does the job
17:32	nooga	if something goes wrong that is
17:32	justin_smith	have you ever upgraded versions?
17:33	nooga	I'm running 0.9.0 updated from 0.8.1 I think
17:33	nooga	or something
17:34	justin_smith	clearly you have some talent I do not
17:35	nooga	I mean it was confusing and stupidly hard but I managed :D
17:36	nooga	+ in 0.9.0, there's this debugger thing
17:36	nooga	which is quite awesome
17:36	justin_smith	I heard about that
17:58	justin_smith	TEttinger2: so how hard do you think it would be to make an algorithm that simulated ancient handwriting? http://www.english.cam.ac.uk/ceres/ehoc/manuscripts/kkca346-7v/
17:58	justin_smith	for all I know this is already a thing
18:06	noncom\|2	justin_smith: how did they ever read this...
18:07	noncom\|2	looks like a write-only thing
18:08	oddcully	the perl of the past
18:12	nooga	yeah, I basically forgot how to write by hand
18:12	nooga	I use pen for signatures only these days
18:15	noncom\|2	i like both writing and drawing with pen, but true, not much chance a day i get to do this
18:16	nooga	oh, drawing is cool, I used to doodle a lot and now I draw diagrams everywhere
18:17	nooga	but my handwriting is write-only
18:21	justin_smith	I've actually taken to using a fountain pen and writing ideas on paper - it's a nice break from keyboards and screens
18:21	justin_smith	it encourages a different kind of thinking
18:22	justin_smith	but I'm fascinated by that ancient handwriting - before super regular cursives like copperplate and such were invented (the kind of writing on the declaration of independence and the constitution)
18:22	justin_smith	but yeah, it's so illegible I was imagining a program that could just invent it
18:23	justin_smith	random combinations of simulated ink strokes that look like they are probably words
18:23	tmtwd	oh so clojure has partial functions allowed in core?
18:23	nooga	looks like a task for a deep learning network
18:23	tmtwd	it doesn't require a special keyword?
18:24	justin_smith	tmtwd: well, we have the function "partial" if that's what you mean
18:24	tmtwd	justin_smith, but its not necessary to use partial?
18:24	noncom\|2	yes, i too sometimes take the initiative to do some handwriting. and also some fine handwork, even if it seems pointless. my main motivation is that fine motorics (as it is called in my language at least), things when you have to put much thought into controlling fine finger moves, stimulates the frontal cortex in a very good way
18:24	tmtwd	for example, we could use macros
18:24	noncom\|2	*neocortex
18:25	noncom\|2	sry
18:25	justin_smith	noncom\|2: exactly - hand writing is good for memory too
18:25	justin_smith	tmtwd: OK, but we don't have currying - don't get those confused
18:25	nooga	I play guitar
18:25	noncom\|2	yep, instruments too
18:26	noncom\|2	i play mainly keys. i also want to get an ukulele
18:26	nooga	in fact, I've arranged a small music room in my office :D
18:26	nooga	since most of us there play some instrument
18:26	noncom\|2	haha :) that's so cool, really
18:27	noncom\|2	justin_smith: i think that a neural net could be well put to work with handwriting
18:27	justin_smith	noncom\|2: oh yeah, that's probably true (as nooga mentioned also)
18:27	noncom\|2	yep
18:28	tmtwd	can we have recursive macros?
18:28	noncom\|2	tmtwd: use macros? how
18:28	noncom\|2	tmtwd: sure
18:28	nooga	tmtwd: what would you like to get?
18:29	tmtwd	noncom\|2, http://pastebin.com/Bv7ucjeh
18:29	noncom\|2	tmtwd: umm, i don't know what you're trying to acheive..
18:29	noncom\|2	ah, currying..
18:30	noncom\|2	i guess..
18:30	TEttinger	tmtwd: currying is... tricky with variadic argument lists
18:30	TEttinger	,(+)
18:30	clojurebot	eval service is offline
18:30	TEttinger	&(+)
18:30	lazybot	⇒ 0
18:30	TEttinger	&(+ 1)
18:30	lazybot	⇒ 1
18:31	noncom\|2	wow! what's up with cljbot
18:31	TEttinger	&(-)
18:31	lazybot	clojure.lang.ArityException: Wrong number of args (0) passed to: core/-
18:31	TEttinger	&(- 1)
18:31	lazybot	⇒ -1
18:31	TEttinger	&(- 1 1)
18:31	lazybot	⇒ 0
18:31	TEttinger	that's an oddity of unary -
18:31	noncom\|2	yep
18:33	noncom\|2	no, seriously, currying is good, but not something i'd be too zealous about...
18:33	noncom\|2	esp that there's (partial)
18:34	TEttinger	Shen has an interesting approach to it. it doesn't allow (+) or (+ 1) to return, but does make them curried. they're roughly equivalent to (partial +) and (partial + 1)
18:34	nooga	btw. is there something to flip args positions in the core?
18:34	justin_smith	recursive macros:
18:34	justin_smith	,(defmacro tweedle-dee [args] (if (> (count args) 3) (cons 'list args) (list 'tweedle-dumb (cons :dee args))))
18:34	clojurebot	eval service is offline
18:34	justin_smith	:P
18:35	justin_smith	,(defmacro tweedle-dumb [args] (list 'tweedle-dee (cons :dumb args)))
18:35	clojurebot	eval service is offline
18:35	justin_smith	anyway, those macros are recursive, if you call (tweedle-dee nil) you get (:dumb :dee :dumb :dee) as the output
18:35	noncom\|2	whats up with clojurebot?
18:36	justin_smith	noncom\|2: I don't know if he likes doing macros
18:36	justin_smith	,(+ 1 1)
18:36	clojurebot	eval service is offline
18:36	justin_smith	oh, something worse
18:36	noncom\|2	,run-self-diagnostics
18:36	clojurebot	eval service is offline
18:36	noncom\|2	dammit
18:37	nooga	,(defn clojurebot [_] "eval service is offline")
18:37	clojurebot	#'sandbox/clojurebot
18:37	nooga	WOW
18:37	justin_smith	anyway, those macros are totally useless, but it was fun inventing recursive macros
18:37	justin_smith	,(defmacro tweedle-dee [args] (if (> (count args) 3) (cons 'list args) (list 'tweedle-dumb (cons :dee args))))
18:37	clojurebot	#'sandbox/tweedle-dee
18:37	nooga	I fixed it!!!!
18:37	justin_smith	,(defmacro tweedle-dumb [args] (list 'tweedle-dee (cons :dumb args)))
18:37	clojurebot	#'sandbox/tweedle-dumb
18:37	justin_smith	,(tweedle-dee nil)
18:37	clojurebot	(:dumb :dee :dumb :dee)
18:37	TEttinger	nooga: what's the situation that calls for flipping arg positions? how does it work with more than 2 args?
18:37	noncom\|2	nooga: haha :D
18:38	justin_smith	nooga: periodically clojure bot resets
18:38	TEttinger	,(defn rev-args [f & args] (apply f (reverse args))
18:38	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
18:38	nooga	TEttinger: sometimes there's a fn of 2 args, on which I'd like to use partial but they're in wrong order
18:39	TEttinger	,(defn rev-args [f & args] (apply f (reverse args)))
18:39	clojurebot	#'sandbox/rev-args
18:39	nooga	TEttinger: and I wouldn't expect it to work on more than 2 args
18:39	TEttinger	,(rev-args - 1 2 3)
18:39	clojurebot	0
18:39	nooga	yeah
18:39	TEttinger	you could define your own partial...
18:39	nooga	that's what I do sometimes, I was just wondering if there was something in clojure.core for that already
18:40	justin_smith	flatland/useful has a few of these kinds of things that people coming from haskell wish clojure had
18:41	nooga	justin_smith: nice one, thanks
18:45	TEttinger	,(defmacro flipper [f & a] `(fn [& args#] (apply ~f (concat args# ~a))))
18:45	clojurebot	#'sandbox/flipper
18:46	TEttinger	,(map (flipper - 3) [10 20 30])
18:46	clojurebot	#<ClassCastException java.lang.ClassCastException: java.lang.Long cannot be cast to clojure.lang.IFn>
18:46	TEttinger	sigh
18:46	justin_smith	,(def flipper' (constantly 'EEEeeeEEEeeEEE....SPLASH))
18:46	clojurebot	#'sandbox/flipper'
18:46	justin_smith	,(map flipper' [10 20 30])
18:46	clojurebot	(EEEeeeEEEeeEEE....SPLASH EEEeeeEEEeeEEE....SPLASH EEEeeeEEEeeEEE....SPLASH)
18:48	gargsms	I have a list of hash-maps ( { :name "Anonymous" :job "Jobless" } { :name "John" :job "Doe" } ... [many more such name job hash-maps] ) and I need to convert it to this
18:48	gargsms	{ "Anonymous" { :name "Anonymous" :job "Jobless" } "John" { :name "John" :job "Doe" } ... }
18:48	gargsms	I tried doseq with no success
18:49	justin_smith	gargsms: ##(group-by :name [{:name "al" :job "mcdonalds"} {:name "joe" :job "president"}])
18:49	lazybot	⇒ {"al" [{:name "al", :job "mcdonalds"}], "joe" [{:name "joe", :job "president"}]}
18:49	justin_smith	that's not identical (it uses vectors in case two people have the same name) but it's close to being your logic
18:50	justin_smith	gargsms: doseq is not for creating values, it can only ever return nil
18:51	gargsms	justin_smith, it does help but it returns the map with vectors
18:51	justin_smith	,(into {} (map (juxt :name identity) [{:name "al" :job "mcdonalds"} {:name "joe" :job "president"}]
18:51	justin_smith	oops
18:51	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
18:51	justin_smith	,(into {} (map (juxt :name identity) [{:name "al" :job "mcdonalds"} {:name "joe" :job "president"}])
18:51	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
18:51	justin_smith	,(into {} (map (juxt :name identity) [{:name "al" :job "mcdonalds"} {:name "joe" :job "president"}]))
18:51	clojurebot	{"al" {:name "al", :job "mcdonalds"}, "joe" {:name "joe", :job "president"}}
18:51	justin_smith	finally
18:51	gargsms	Haha
18:51	justin_smith	sorry for that flailing-about
18:52	gargsms	juxt is for?
18:52	justin_smith	just returns a vector of the result of each function
18:52	justin_smith	,((juxt inc identity dec) 0)
18:52	clojurebot	[1 0 -1]
18:53	justin_smith	,((juxt remove filter) even? (range 5))
18:53	clojurebot	[(1 3) (0 2 4)]
18:54	noncom\|2	btw just found out here they allow to excersise in clojure https://www.codingame.com/games
18:55	gargsms	justin_smith, just a quick question. The returned map from what you gave me has a comma separated pairs. Are { "a" {:name "b"} "c" {:name "d"} } and { "a" {:name "b"}, "c" {:name "d"} } equivalent?
18:55	justin_smith	gargsms: yes, commas are whitespace
18:56	justin_smith	,(= [1 2 3], [1, 2, 3], [,,,,,1,,,,,,2,,,,,,3,,,,,,],,,,,,,)
18:56	clojurebot	true
18:56	noncom\|2	,,,,,,,,,,,,,,,,,,,
18:56	clojurebot	#<RuntimeException java.lang.RuntimeException: EOF while reading>
18:56	gargsms	Ah. Thanks a lot. I will need to understand the function you gave me first. I am starting with clojure.
18:56	justin_smith	for obviously we avoid doing excessive silliness with commas, but they are not meaningful in clojure :)
18:57	AeroNotix	,[1,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,1]
18:57	justin_smith	*for obvious reasons
18:57	clojurebot	[1 1]
18:57	justin_smith	I sometimes abuse commas to make the beginning of a line in my editor line up a specific way
18:57	nooga	NaNNaNNaNNaNNa...
18:57	noncom\|2	,"it's coma party"
18:57	clojurebot	"it's coma party"
18:58	noncom\|2	,NaN
18:58	clojurebot	#error {\n :cause "Unable to resolve symbol: NaN in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: NaN in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol: NaN in this conte...
18:58	justin_smith	noncom\|2: you probably want Double/NaN
18:58	noncom\|2	,Double/Nan
18:58	clojurebot	#error {\n :cause "Unable to find static field: Nan in class java.lang.Double"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to find static field: Nan in class java.lang.Double, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to find st...
18:58	noncom\|2	,Double/NaN
18:58	clojurebot	NaN
18:58	justin_smith	,(/ 0 0)
18:58	clojurebot	#error {\n :cause "Divide by zero"\n :via\n [{:type java.lang.ArithmeticException\n :message "Divide by zero"\n :at [clojure.lang.Numbers divide "Numbers.java" 158]}]\n :trace\n [[clojure.lang.Numbers divide "Numbers.java" 158]\n [clojure.lang.Numbers divide "Numbers.java" 3808]\n [sandbox$eval299 invokeStatic "NO_SOURCE_FILE" 0]\n [sandbox$eval299 invoke "NO_SOURCE_FILE" -1]\n [clojure.la...
18:58	justin_smith	err
18:59	noncom\|2	,(- Double/NaN Double/Nan)
18:59	justin_smith	,(/ 0 0.0)
18:59	clojurebot	#error {\n :cause "Unable to find static field: Nan in class java.lang.Double"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to find static field: Nan in class java.lang.Double, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to find st...
18:59	clojurebot	NaN
18:59	noncom\|2	,(- Double/NaN Double/NaN)
18:59	clojurebot	NaN
18:59	justin_smith	,(hash-map (/ 0 0.0) :a (/ 0 0.0) :b)
18:59	clojurebot	{NaN :a, NaN :b}
19:00	noncom\|2	wooooow
19:00	noncom\|2	heeey wait..
19:00	noncom\|2	how so
19:00	justin_smith	,(contains? (hash-map (/ 0 0.0) :a (/ 0 0.0) :b) (/ 0 0.0))
19:00	clojurebot	false
19:00	justin_smith	that's why
19:00	noncom\|2	boxed?
19:00	justin_smith	the hash map doesn't think a key is duplicate if it isn't equal
19:00	justin_smith	,(= (/ 0 0.0) (/ 0 0.0))
19:00	clojurebot	false
19:00	noncom\|2	ah..
19:00	noncom\|2	no equality for NaN
19:01	justin_smith	right
19:01	justin_smith	well - almost!
19:01	justin_smith	,(let [nana (/ 0 0.0)] (= nana nana))
19:01	clojurebot	false
19:01	noncom\|2	hmm
19:01	justin_smith	err... there's a trick here to make it return true...
19:01	justin_smith	forgetting the trick
19:01	noncom\|2	yeah, but i got the idea
19:01	justin_smith	,(let [nana (/ 0 0.0)] (hash-map nana :a nana :b))
19:01	clojurebot	{NaN :a, NaN :b}
19:02	justin_smith	Bronsa figured out how to make two NaNs equal in some context - it was weird
19:02	noncom\|2	hm
19:02	noncom\|2	oh yeah, he could do this, he know everything about evaluation
19:06	justin_smith	welcome
19:07	gargsms	coming from JavaScript background, I can relate to (= NaN NaN) being false
19:07	justin_smith	gargsms: that's actually specified by IEEE floating point
19:07	gargsms	What exactly is NaN then?
19:08	justin_smith	it's a value that isn't a number - it's an undefined arithmetical result that is not equal to any number, nor itself
19:08	justin_smith	it's the specified result for operations that are nonsense
19:08	justin_smith	like (/ 0.0 0.0)
19:08	gargsms	Well, in JS you can have !NaN === !NaN
19:08	justin_smith	,(not Double/NaN)
19:08	clojurebot	false
19:09	justin_smith	,(= (not Double/NaN) (not Double/NaN))
19:09	clojurebot	true
19:09	gargsms	Yes
19:09	justin_smith	but not always returns a boolean, never a numeric
19:10	justin_smith	oh which is true in js too
19:10	gargsms	How else can you make (= NaN NaN) true without coercion then?
19:10	noncom\|2	,(= (read-string "NaN") (read-string "NaN"))
19:10	clojurebot	true
19:10	justin_smith	noncom\|2: those were symbols
19:10	gargsms	Ha!
19:11	justin_smith	,(type (read-string "NaN"))
19:11	clojurebot	clojure.lang.Symbol
19:11	danielle_romes	,(= "NaN" "NaN")
19:11	clojurebot	true
19:11	justin_smith	gargsms: it's a trick where in a specific context you can make clojure use a boxed number and compare by hash value and not true equality
19:11	justin_smith	gargsms: it's somewhat tricky to set up and I forget how
19:12	gargsms	some other time
19:12	justin_smith	I'm sure next time Bronsa is around he will remember how it worked
19:21	TEttinger	woo finally I can copy things without sometimes crashing my IRC client!
19:22	TEttinger	sorry about the join/crash spam
19:28	wasamasa	you could grab a znc and put it somewhere with a good connection
19:29	TEttinger	it wasn't a connection issue, it was a UI doesn't like whatever locked the clipboard issue...
19:29	TEttinger	,(defmacro flipper [f# & a#] `(fn [& args#] (apply ~f# (concat args# [~@a#]))))
19:29	clojurebot	#'sandbox/flipper
19:30	TEttinger	,(map (flipper - 3) [10 20 30])
19:30	clojurebot	(7 17 27)
19:31	ashwink005_	can I convert a url query string to a Hashmap in clojure?
19:31	justin_smith	ashwink005_: yeah, ring's wrap-query-params middleware will do that for you
19:32	ashwink005_	justin_smith: and I can refer to it using what keyword?
19:32	ashwink005_	not :params I guess
19:32	justin_smith	ashwink005_: :query-params
19:33	justin_smith	ashwink005_: wrap-params merges query-params with body params etc. into one :params map
19:33	ashwink005_	hmm.. is this the correct syntax?
19:33	ashwink005_	wait
19:34	ashwink005_	(def app (-> (wrap-defaults app-routes site-defaults) (wrap-cookies) ))
19:34	ashwink005_	app-routes is my handler
19:42	gargsms	ashwink005_, avoid wrap-defaults or you may end up having ANTI-FORGERY token issues
19:42	ashwink005_	gargsms: jaa yahan se
19:45	rhg135	You can disable just that. See the site
19:51	gargsms	justin_smith, I am securing some of my routes with friend and I want some routes open. Can I have different route groups?
19:52	gargsms	I tried it and only one of them seems to work, whichever I pass first
19:53	justin_smith	gargsms: I'm not good with compojure (I don't use it myself beacuse it is hard to do higher order stuff with it in my experience) but there is definitely a way to combine two groups of routes in compojure.
19:53	ashwink005_	justin_smith: doing wrap params only. Still the request params are coming inside the query-string keyword
19:53	justin_smith	I assume that is what you are using for routing.
19:53	gargsms	justin_smith, Yes, in fact I am.
19:54	justin_smith	ashwink005_: wrap-params will take request params and query params etc. and merge them into one :params, but iirc you still need the other middlewares to parse those
19:54	justin_smith	wrap-params itself doesn't do all that parsing I don't think
19:56	ashwink005_	justin_smith: I'm actually printing the request received. It still shows me a query string inside :query-string keyword.
19:56	ashwink005_	justin_smith: do confirm the syntax
19:56	ashwink005_	(-> (wrap-params app-routes)(wrap-cookies))
19:58	justin_smith	,(macro-expand '(-> (wrap-params app-routes)(wrap-cookies)))
19:58	clojurebot	#error {\n :cause "Unable to resolve symbol: macro-expand in this context"\n :via\n [{:type clojure.lang.Compiler$CompilerException\n :message "java.lang.RuntimeException: Unable to resolve symbol: macro-expand in this context, compiling:(NO_SOURCE_PATH:0:0)"\n :at [clojure.lang.Compiler analyze "Compiler.java" 6704]}\n {:type java.lang.RuntimeException\n :message "Unable to resolve symbol:...
19:58	justin_smith	,(macroexpand '(-> (wrap-params app-routes)(wrap-cookies)))
19:58	clojurebot	(wrap-cookies (wrap-params app-routes))
19:58	justin_smith	yeah, looks right
19:59	justin_smith	remember that -> is just a convenience, the more middleware you have the more helpful it gets
19:59	justin_smith	but it's just a convenient way to do function wrapping
20:01	ashwink005_	could u suggest some middleware that could cause this problem?
20:01	ashwink005_	params empty and query-string full
20:01	justin_smith	ashwink005_: like I said it's because you are not using wrap-query-params
20:03	justin_smith	or at least that's what I meant to say
20:03	ashwink005_	justin_smith: okie I'll give it a shot
20:05	ashwink005_	justin_smith: whats the dependency?
20:06	justin_smith	oh, I was wrong
20:06	justin_smith	just use wrap-params
20:06	justin_smith	:params will be all param types merged
20:06	justin_smith	:query-params will be just the query params
20:07	ashwink005_	yeah I am using the wrap-params
20:07	ashwink005_	still no luck. The params map is empty
20:07	justin_smith	and you are providing query parameters?
20:07	justin_smith	because in my experience that middleware works
20:08	ashwink005_	justin_smith: yes
20:08	ashwink005_	the parameters are coming inside the query-string keyword likeI said
20:09	justin_smith	OK, :params is supposed to be the merge of query params with form-params
20:09	justin_smith	:query-string isn't the param map, it's the raw string
20:09	ashwink005_	yup thats how it looks
20:10	justin_smith	have you restarted your server since putting wrap-params in there?
20:10	ashwink005_	I just want my parameters added in my js file to come inside the params map
20:10	ashwink005_	justin_smith: yup did that
20:12	domokato	what's the best way to model a one-to-one relationship between two kinds of data? For example, A "has a" B and B "has an" A (the same A). I could use a pair of maps, A->B and B->A, but maintaining them is repetitive and potentially error prone
20:12	domokato	is there something built-in that is more appropriate?
20:13	justin_smith	domokato: I think there's a bi-map out there somewhere, but beware duplicate keys of course
20:17	tmtwd	what is the difference between these 2 macros? they seem to do the same thing http://pastebin.com/8PUKsgKq
20:20	justin_smith	tmtwd: in the second one, weird things can happen with x
20:20	justin_smith	via capture
20:23	TEttinger	domokato: there's the set of sets approach
20:24	TEttinger	,#{ #{:A :B} #{:A :C :D} }
20:24	clojurebot	#{#{:A :D :C} #{:A :B}}
20:25	cfleming	justin_smith: TEttinger: Yeah, the new pricing is, um, interesting. I hope it won't affect what I have to do with Cursive.
20:25	cfleming	They have confirmed that the OSS versions will not be affected, and Cursive will always work with them.
20:26	TEttinger	I wonder if Android Studio will be affected
20:26	cfleming	Currently they're not planning to change their release model, i.e. moving to a rolling update model or anything like that, which would have been much more complicated for me.
20:26	cfleming	No, that's free and based on the community edition AFAIK
20:27	TEttinger	what does the pro version of IDEA even... offer above Community?
20:28	domokato	TEttinger: it's not many-to-many, it's one-to-one
20:28	domokato	thanks tho
20:36	ashwink005_	has anyone used ring.util.codec ?
20:36	ashwink005_	(ring.util.codec/form-decode "baz=3&bar=2&foo=1") gives {"foo" "1", "bar" "2", "baz" "3"}
20:36	ashwink005_	how can I retain the keywords?
20:38	ashwink005_	hellooo?
20:40	rhg135	Retain implies they were once
20:44	amalloy	ashwink005_: once you start paying for IRC tech support you can offer indignant "hellooo?" when nobody answers at a time that's convenient for you. but while people here are helping you just because they want to help, it is rather tacky
20:44	ashwink005_	amalloy: ok sorry didn't know that
20:45	ashwink005_	amalloy: new to IRC, will keep in mind
20:45	amalloy	anyway, once you have that map you can convert to keywords if you want, the same way you would for any map; the fact that it came from form-decode is no longer relevant
20:46	justin_smith	though some keys that would be legal in a form context might not be good keywords, which is one reason for not converting them
20:52	amalloy	yes, better to either look them up as strings or to convert a fixed set of form parameters that you actuall expect, rather than converting any old junk into a keyword
20:52	ashwink005_	yeah I'm using the keywordize-keys function from the walk library
20:53	ashwink005_	does the job
20:53	cfleming	TEttinger: It offers lots of Java enterprise stuff you probably don't care about, and a lot of very useful web tech stuff that you might care about.
21:24	beginner	Hello! I am a beginner to clojure. I need an asynchronous library to do some web scraping and mining but there's so many that I am unable to decide. I have some experience with asyn stuff from programming in Go. Which library is the best to get started with? Aleph manifold core.async etc.?
22:40	talios	anyone here using the https://github.com/leonardoborges/bouncer library? ( or have suggestions for a better validations library ) - want to return multiple validation results from a single validation, which I don't think I can with bouncer