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clojurians | clojure | <@Berry> you know that conj takes multiple args and that you can use into as well right? | 2017-12-21T17:41:26.000303 | Margaret |
clojurians | clojure | yes, but I believe that becomes liner time, not O(1) | 2017-12-21T17:46:33.000238 | Berry |
clojurians | clojure | doesn’t a doubly linked list do that for you? | 2017-12-21T17:53:25.000112 | Thu |
clojurians | clojure | doubly linked lists really aren't functional | 2017-12-21T17:56:25.000113 | Berry |
clojurians | clojure | ot "merge" the two lists, you have to modify the prev/next pointersx | 2017-12-21T17:56:39.000229 | Berry |
clojurians | clojure | is there a way to make jdbc dump the sql statements it’s making? I have a sql query that is working through psql but it doesnt return anything through jdbc, and I don’t get any errors either… | 2017-12-21T17:57:25.000198 | Williemae |
clojurians | clojure | yeah, you can’t do the sharing clojure would normally do with lists | 2017-12-21T17:57:25.000319 | Margaret |
clojurians | clojure | what about those zipper things that I refused to learn about when i was trying to learn haskell | 2017-12-21T18:00:47.000205 | Thu |
clojurians | clojure | > to make a doubly-linked list, you need to construct it all at once, and if you ever want to change any part of it, you either need to use a Zipper or just make a complete copy of it every time
<https://stackoverflow.com/questions/10386616/how-to-implement-doubly-linked-lists> | 2017-12-21T18:08:44.000005 | Margaret |
clojurians | clojure | <@Berry> did anyone mention finger trees yet? | 2017-12-21T18:08:56.000268 | Margaret |
clojurians | clojure | ok | 2017-12-21T18:09:12.000031 | Williemae |
clojurians | clojure | why do sql query examples not use the goddamn results | 2017-12-21T18:09:24.000248 | Williemae |
clojurians | clojure | <@Berry> <https://github.com/clojure/data.finger-tree> | 2017-12-21T18:09:41.000329 | Margaret |
clojurians | clojure | <@Williemae> Ask in <#C1Q164V29|sql> if you want to avoid the noise of this channel... | 2017-12-21T18:10:57.000210 | Daniell |
clojurians | clojure | <@Margaret> fingertrees look interesting | 2017-12-21T18:36:55.000064 | Berry |
clojurians | clojure | I just had an epiphany while implementing Joy in Clojure. Stack based langauges = basicaly programming iwth de bruijn indices instead of variable names. | 2017-12-21T18:37:39.000028 | Berry |
clojurians | clojure | If you are worried about constant factors in run time, you might want to do some profiling of finger trees vs. other data structures like plain old Clojure vectors and/or RRB vectors. I haven't done it myself, but recall that finger trees have constant factors of run time significantly higher than the others. Not O() bad things, but something that might affect what you want to use anyway. | 2017-12-21T18:51:42.000172 | Micha |
clojurians | clojure | yeah, profiling with actual runtime conditions is always called for if there are performance problems | 2017-12-21T19:03:34.000172 | Margaret |
clojurians | clojure | speculatively optimizing before you have something that works is a great way to waste a lot of energy | 2017-12-21T19:03:58.000047 | Margaret |
clojurians | clojure | It just occurred to me... we should update our multi-version testing to check code against `clojure-1.10.0-master-SNAPSHOT` now that 1.9 is released! :laughing: | 2017-12-21T21:24:24.000236 | Daniell |
clojurians | clojure | When using `pprint` on a map containing namespaced keywords, long namespace prefixes are kind of a headache, pushing the output far to the right. Is there a way (short of writing my own formatter) of having it substitute aliases for the full namespace name? | 2017-12-21T21:30:30.000043 | Edmond |
clojurians | clojure | `(set! *print-namespace-maps* false)` perhaps? | 2017-12-21T21:40:36.000202 | Daniell |
clojurians | clojure | (not sure how you'd get an alias substituted in -- unless you wrote your own `print-method` for `clojure.lang.IPersistentMap`?) | 2017-12-21T21:42:30.000062 | Daniell |
clojurians | clojure | `*print-namespace-maps*` is a little better, though it sort of shifts the readability problem. I guess I'll think on making a custom `print-method` that interrogates the current ns aliases or something. | 2017-12-21T22:20:50.000007 | Edmond |
clojurians | clojure | how expensive is the overhead of a vector with one element ? | 2017-12-22T01:34:29.000073 | Berry |
clojurians | clojure | (compared to just storing that element) | 2017-12-22T01:34:37.000110 | Berry |
clojurians | clojure | ~sizeof(Object[32]) IIRC | 2017-12-22T02:07:06.000175 | Charity |
clojurians | clojure | So probably not very | 2017-12-22T02:07:14.000111 | Charity |
clojurians | clojure | Is there a builtin for:
```
(defn u-in [obj path f]
(let [o (get-in obj path)
[nv & rst] (f o)]
(into [(assoc-in obj path nv)] rst)))
(u-in {:a {:b 2}
:foo :cat} [:a :b] (fn [x] [(inc x) :foo]))
``` | 2017-12-22T04:22:25.000275 | Berry |
clojurians | clojure | is there a better way to write:
```
(fn [[o f]] (f o))
```
it seems like a weird enough function there should be some weird name for it | 2017-12-22T04:45:27.000233 | Berry |
clojurians | clojure | (eval (rseq ....)) :bomb::boom: | 2017-12-22T05:02:11.000244 | Lucretia |
clojurians | clojure | is there a 'stateful iterate' ?
i.e. suppose
(f x0) = [x1, v1]
(f x1) = [x2, v2]
(f x2) = [x3, v3]
....
I want something where
(g x0 3) = [x3, [v1 v2 v3]) | 2017-12-22T05:57:28.000267 | Berry |
clojurians | clojure | is there a way to ask cloc to count test code separately? | 2017-12-22T07:10:51.000084 | Berry |
clojurians | clojure | basically, anything defined via (ct/...) where ct = clojure.test | 2017-12-22T07:11:01.000117 | Berry |
clojurians | clojure | (def fapp (fn [[f & args]] (apply f args))) <-- wtf, is this function just #(apply apply %) ? | 2017-12-22T08:02:49.000011 | Berry |
clojurians | clojure | woah clojure is just incredible, there are plenty of different macros and then you think “super handy - if there was only a way do _slightly_ diverge from the default behavior”, and then you google a bit and there *is* for sure something build in :smile: | 2017-12-22T08:41:08.000086 | Marcel |
clojurians | clojure | <https://clojurians.slack.com/archives/C03S1KBA2/p1513940248000267>
`(map second (iterate f x0))` | 2017-12-22T09:18:31.000203 | Xavier |
clojurians | clojure | ah, didn’t notice you want all the `v`s | 2017-12-22T09:19:11.000007 | Xavier |
clojurians | clojure | ```(->> [0 []]
(iterate (fn [[x vs]]
(let [[x' v'] (f x)]
[x' (conj vs v')])))
next
(take 3))``` | 2017-12-22T09:27:29.000562 | Xavier |
clojurians | clojure | <@Heriberto> a lumo version issuer. <#C4C63FWP5|unrepl> is a better place for unravel issues | 2017-12-22T09:58:57.000095 | Marla |
clojurians | clojure | <@Marla> Thanks! | 2017-12-22T10:08:43.000237 | Heriberto |
clojurians | clojure | Who said that Clojure's long startup time can't be fixed? :grinning:
See <https://stackoverflow.com/questions/19107683/speed-up-clojure-startup-time-with-nailgun> | 2017-12-22T10:39:02.000408 | Heriberto |
clojurians | clojure | >In my case, startup time of the actual script went down to 80ms | 2017-12-22T10:39:28.000113 | Heriberto |
clojurians | clojure | is there a way to make `clj` start the repl in a certain namespace? | 2017-12-22T11:49:23.000553 | Judy |
clojurians | clojure | `:repl-options :init-ns` | 2017-12-22T11:50:07.000526 | Leann |
clojurians | clojure | so, in project.clj, you could add: `:repl-options {:init-ns user :port 4001 :nrepl-middleware [cemerick.piggieback/wrap-cljs-repl]}` | 2017-12-22T11:50:29.000591 | Leann |
clojurians | clojure | no i'm talking about `clj` which comes with tools.deps, not leiningen | 2017-12-22T11:50:52.000081 | Judy |
clojurians | clojure | it’s a little cumbersome but you could do | 2017-12-22T14:06:56.000087 | Sonny |
clojurians | clojure | `clj -e "(use 'clojure.set) (in-ns 'clojure.set)" -r` | 2017-12-22T14:06:57.000501 | Sonny |
clojurians | clojure | my favorite golfing of require / switch ns is `(doto 'clojure.set require in-ns)` | 2017-12-22T14:09:36.000223 | Margaret |
clojurians | clojure | What would you call the value that `peek` returns? You can't call it "first" or "last" since that depends on the type you supply. | 2017-12-22T15:12:11.000154 | Liza |
clojurians | clojure | not only that but first and last are functions you probably don't want to shadow | 2017-12-22T15:14:26.000179 | Margaret |
clojurians | clojure | for a stack, it would be the top value | 2017-12-22T15:14:40.000241 | Margaret |
clojurians | clojure | That's true. Doesn't really matter what the type of the structure is because chances are good you're using it as a stack or queue if you're using `pop` and `peek`. | 2017-12-22T15:15:24.000154 | Liza |
clojurians | clojure | Thanks. I just needed a gut check on that. | 2017-12-22T15:15:31.000258 | Liza |
clojurians | clojure | I needed an appropriate name for this convenience function I just wrote:
```
(defn update-top [coll fun & args]
(conj (pop coll) (apply fun (peek coll) args)))
``` | 2017-12-22T15:19:20.000152 | Liza |
clojurians | clojure | does anyone know how to _write_ to STDIN from clojure? I'd like to write a string to STDIN so that a process listening to `*in*`would be able to consume the string | 2017-12-22T15:40:56.000055 | Eldridge |
clojurians | clojure | unorthodox, i know, but mostly for hacky purposes | 2017-12-22T15:41:38.000229 | Eldridge |
clojurians | clojure | <@Eldridge> are these 2 separate processes? | 2017-12-22T15:47:22.000046 | Ambrose |
clojurians | clojure | well one of them is a repl and the other is a server receiving messages across a web socket | 2017-12-22T15:48:39.000121 | Eldridge |
clojurians | clojure | is the repl running in the same process as the server? | 2017-12-22T15:49:07.000159 | Ambrose |
clojurians | clojure | yes | 2017-12-22T15:49:15.000040 | Eldridge |
clojurians | clojure | AFAIK you need to resort to OS functionality to write to STDIN - it's something I wouldn't expect the jvm to abstract or provide for you | 2017-12-22T15:52:17.000188 | Margaret |
clojurians | clojure | is the server listening on both stdin and the websocket? | 2017-12-22T15:53:09.000106 | Ambrose |
clojurians | clojure | what is the interpretation of this `(spit *in* some-string)` | 2017-12-22T15:53:14.000234 | Eldridge |
clojurians | clojure | no | 2017-12-22T15:53:20.000269 | Eldridge |
clojurians | clojure | server only listens to websocket | 2017-12-22T15:53:27.000204 | Eldridge |
clojurians | clojure | you can't spit to `*in*`, that will just throw an exception; beyond the obvious `*in*` can be freely rebound, and the binding only has to support reading | 2017-12-22T15:53:46.000281 | Margaret |
clojurians | clojure | which process is listening to `*in*` | 2017-12-22T15:54:08.000014 | Ambrose |
clojurians | clojure | the repl | 2017-12-22T15:54:17.000017 | Eldridge |
clojurians | clojure | to rephrase my question: there is a websocket server running in a repl and I want the msg coming through the socket to be interpreted by the repl as if it was entered from STDIN | 2017-12-22T15:55:16.000368 | Eldridge |
clojurians | clojure | you can easily start a repl that listens to a fifo or socket btw | 2017-12-22T15:55:26.000444 | Margaret |
clojurians | clojure | I'd start a repl on a new thread in the same process, and bind `*in*` to the input from the socket | 2017-12-22T15:55:59.000118 | Margaret |
clojurians | clojure | STDIN isn't special | 2017-12-22T15:56:03.000209 | Margaret |
clojurians | clojure | true. thats a good idea. | 2017-12-22T15:56:39.000124 | Eldridge |
clojurians | clojure | thank you | 2017-12-22T15:56:43.000221 | Eldridge |
clojurians | clojure | and you probably want it's `*out*` to send back to the client too, for that matter | 2017-12-22T15:57:04.000359 | Margaret |
clojurians | clojure | clojure has a built in socket repl class, but for a websocket you might need to write your own (also I'm sure you're aware this a security nightmare) | 2017-12-22T15:57:38.000209 | Margaret |
clojurians | clojure | yeah =/ other than an http request, websockets seemed the only way to talk to a remote repl from the browser | 2017-12-22T15:59:57.000225 | Eldridge |
clojurians | clojure | right, the problem is that a repl effectively gives root because every single mainstream OS has local root holes that don't require physical access | 2017-12-22T16:01:20.000155 | Margaret |
clojurians | clojure | if you trust everyone who can load the web page to have root, that works out (I'd be very careful about who can visit the page of course) | 2017-12-22T16:01:45.000368 | Margaret |
clojurians | clojure | it would be internal to my company's network, but yes I understand the implication. Are jupyter notebooks with ipython kernels similarly insecure? | 2017-12-22T16:02:40.000068 | Eldridge |
clojurians | clojure | I don't know python - but a good indicator would be how hard is it to make a shell call inside the python code... if they can run a system command then it's probably about the same | 2017-12-22T16:03:42.000213 | Margaret |
clojurians | clojure | indeed you can with little in the way. thats at least *a bit* comforting | 2017-12-22T16:04:27.000055 | Eldridge |
clojurians | clojure | <@Sonny> have a quick question about `clojure.java.classpath/classpath-directories` with JDK 9 | 2017-12-22T16:06:32.000267 | Elanor |
clojurians | clojure | I got an issue for migratus recently <https://github.com/yogthos/migratus/issues/126> | 2017-12-22T16:07:13.000077 | Elanor |
clojurians | clojure | and traced it down to the fact that the behavior of `classpath-directories` changed when using JDK 9 | 2017-12-22T16:07:59.000195 | Elanor |
clojurians | clojure | when I run it with JDK 8 or below I see something like:
```
(#object[java.io.File 0x30efe7c "/Users/yogthos/src/migratus/test"]
#object[java.io.File 0x70111841 "/Users/yogthos/src/migratus/src"]
#object[java.io.File 0x51ee3ff3 "/Users/yogthos/src/migratus/resources"]
#object[java.io.File 0x24a1e205 "/Users/yogthos/src/migratus/target/classes"])
``` | 2017-12-22T16:08:40.000045 | Elanor |
clojurians | clojure | however running on JDK 9 returns an empty seq | 2017-12-22T16:08:54.000001 | Elanor |
clojurians | clojure | is this a bug? | 2017-12-22T16:09:00.000131 | Elanor |
clojurians | clojure | 3 lines of unit test per line of code -- is this within reasonable limits, or is it ridicilous ? | 2017-12-22T16:30:30.000077 | Berry |
clojurians | clojure | depends on how much logic you like to put on a line I guess | 2017-12-22T16:31:23.000234 | Margaret |
clojurians | clojure | here's an example of code + unit tests:
```
(do ;; stateful
(def si (fn [f s] (itr #(f (first %)) [s])))
(def sic (fn [f s n] (take (+ n 1) (siter f s))))
(def sics (juxt #(first (last %)) #(map second (rest %))))
(def sis (fn [f s n] (sics (sic f s n))))
(def sfc (fn [f c [o sf] i] (va [id #(c sf %)] (f o i))))
(def smap (fn [f o lst] (reduce #(sfc f conj %1 %2) [o []] lst)))
(def swu (fn [s t f] (if (t s) (recur (f s) t f) s)))
(let [g0 (juxt inc #(* 2 %))
g1 (fn [s i] [(+ s i) (+ (* 10000 s) i)])]
(ct/is (= (sic g0 0 3) [[0] [1 0] [2 2] [3 4]]))
(ct/is (= (sis g0 0 3) [3 [0 2 4]]))
(ct/is (= (smap g1 0 [1 2 3 ]) [6 [1 10002 30003]]))
(ct/is (= (swu 1 #(< % 10) #(+ % 2)) 11))))
``` | 2017-12-22T16:32:12.000003 | Berry |
clojurians | clojure | looks like things break down here:
```
(map
get-urls
(take-while
identity
(iterate #(.getParent ^ClassLoader %) (clojure.lang.RT/baseLoader))))
=> (nil nil nil nil nil nil)
``` | 2017-12-22T16:49:09.000277 | Elanor |
clojurians | clojure | while you can create new functions for various combinations of builtins, there’s something to be said for writing most of your code in terms of more common functions | 2017-12-22T17:14:54.000010 | Jonas |
clojurians | clojure | for example, if you us `smap` somewhere | 2017-12-22T17:15:43.000077 | Jonas |
clojurians | clojure | to figure out what it does you have to then go and figure out what `sfc` does | 2017-12-22T17:15:59.000224 | Jonas |
clojurians | clojure | which means you have to figure out what `va` does | 2017-12-22T17:16:13.000055 | Jonas |
clojurians | clojure | and I don’t know what `va` does | 2017-12-22T17:16:27.000203 | Jonas |
clojurians | clojure | nothing like a codebase that forces you to master a language only used in Tolkien's Sylmarillion in order to understand it | 2017-12-22T17:19:05.000128 | Margaret |
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