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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()... | 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/... | 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 [... | 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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