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clojurians | clojure | Nobody has mentioned elixir yet? | 2017-11-09T07:39:35.000102 | Merri |
clojurians | clojure | I bet lumo would run on the pi as well. | 2017-11-09T07:40:40.000044 | Merri |
clojurians | clojure | :slightly_smiling_face: | 2017-11-09T07:41:17.000258 | Darci |
clojurians | clojure | <@Darci> lfe is quite solid/stable | 2017-11-09T07:44:22.000161 | Weston |
clojurians | clojure | ok... so I may give that a try. | 2017-11-09T07:45:03.000174 | Darci |
clojurians | clojure | but even tho clojerl is younger it looks more appealing, lfe inherits from a lot of common lisp idioms | 2017-11-09T07:45:03.000280 | Weston |
clojurians | clojure | yeah... well, I can bet it'll be stable and try clojerl. No harm done in the first months anyway :slightly_smiling_face: | 2017-11-09T07:45:42.000281 | Darci |
clojurians | clojure | it's prolly super alpha but it's moving fast it looks like | 2017-11-09T07:46:02.000261 | Weston |
clojurians | clojure | :+1: | 2017-11-09T07:46:27.000022 | Darci |
clojurians | clojure | <@Celina> I prefer to only have a few keys in my mongo document (basically whatever needs indexing) plus an embedded transit string | 2017-11-09T07:53:19.000046 | Margaret |
clojurians | clojure | because this allows using all the core clojure data types (plus whatever else I implement readers / writers for as needed) | 2017-11-09T07:53:45.000292 | Margaret |
clojurians | clojure | monger will auto-convert all map keys to strings going in, and by default will turn those into keywords coming out, which leads to terrible things like `{1 :a}` (key is a number) becoming `{:1 "a"}` (key is a terrible, illegal keyword) | 2017-11-09T07:55:02.000281 | Margaret |
clojurians | clojure | <https://github.com/cognitect/transit-clj> | 2017-11-09T07:57:02.000123 | Margaret |
clojurians | clojure | Thanks <@Margaret> we are converting the keys to strings befor insertion and it seems to be working | 2017-11-09T07:59:41.000479 | Celina |
clojurians | clojure | right, my point directly to your question is that "namespaced keys" can't exist in mongo without you encoding | 2017-11-09T08:00:51.000479 | Margaret |
clojurians | clojure | yeah I see that now | 2017-11-09T08:01:06.000268 | Celina |
clojurians | clojure | whether it's a simple assumption like "if there's a / that's namespaced and it should be a keyword" or a more advanced usage like embedding a full encoded clojure data payload (my choice has been the latter - it simplifies a lot of things) | 2017-11-09T08:01:47.000341 | Margaret |
clojurians | clojure | `IllegalAccessException class clojure.core$bean$fn__5975$fn__5976 cannot access a member of class sun.management.MemoryImpl (in module java.management) with modifiers "public" jdk.internal.reflect.Reflection.newIllegalAccessException (Reflection.java:361)`
(i'm on java9) | 2017-11-09T08:10:30.000540 | Jutta |
clojurians | clojure | 1. In namespace foo.bar , I created a keyword ::apple
2. In namespace snip, I did (:require [foo.bar :as fb])
3. I'm trying to use fb/:apple ... but am getting an 'no such var error
4. Is there a wa yot refer to a keyword in a namespace via the alias ? | 2017-11-09T10:43:07.000674 | Berry |
clojurians | clojure | <@Berry> use `::fb/apple` | 2017-11-09T10:44:46.000122 | Daniell |
clojurians | clojure | <@Daniell>: works; thanks | 2017-11-09T10:45:15.000670 | Berry |
clojurians | clojure | The `::` auto-resolves the alias. | 2017-11-09T10:45:28.000369 | Daniell |
clojurians | clojure | You'll see that a lot if you do XML manipulation, with the XML namespaces :wink: | 2017-11-09T10:46:33.000204 | Mallie |
clojurians | clojure | Or use spec... | 2017-11-09T10:47:53.000270 | Daniell |
clojurians | clojure | This is from spec use. For the past few days, I've been thinking "getting errors with deep stacks is really annoying -- wouldn't it be great if, for each function, I had two functions:
one to check if the input is correct format
one to actually evaluate
and the check-correct-format function is run before hand"
-- then I realize I just rediscovered spec | 2017-11-09T10:51:36.000112 | Berry |
clojurians | clojure | i think you just rediscovered pre/post conditions rather than spec :) | 2017-11-09T10:53:32.000071 | Kareen |
clojurians | clojure | <@Kareen>: good point, those all the 'pre-conditions' are checks of the form 'this var has the following shape' -- and the shapes are composable | 2017-11-09T10:55:43.000416 | Berry |
clojurians | clojure | honestly the jvm can be hard to reason about anyway, especially when you add clojure's runtime on top of that. | 2017-11-09T12:10:23.000411 | Evelin |
clojurians | clojure | My project depends on two libraries that both depend on respectively `some-lib 1.1.1` and `some-lib 1.1.2`. According to `lein deps :tree`, `some-lib 1.1.1` is pulled in. I thought newest version would win in this case? | 2017-11-09T13:55:23.000052 | Laurette |
clojurians | clojure | Oh, btw, I get a warning when running `lein deps :tree` that may explain it in the concrete case:
```
[bidi "2.1.2"] -> [prismatic/schema "1.1.3"]
overrides
[io.nervous/eulalie "0.6.11-SNAPSHOT"] -> [prismatic/plumbing "0.5.5" :exclusions [org.clojure/clojure]] -> [prismatic/schema "1.1.7"]
```
So how come `bidi` overrides in this case? | 2017-11-09T13:59:32.000430 | Laurette |
clojurians | clojure | there is no “newest wins” logic - you can use :exclusions, or ensure that the the dep walking finds the version you want before the other one (including explicitly adding the one you want earlier in the list) | 2017-11-09T14:00:46.000458 | Margaret |
clojurians | clojure | it uses the first one it finds, and it searches from the beginning of your deps vector to the end | 2017-11-09T14:01:11.000456 | Margaret |
clojurians | clojure | <@Margaret> I tried putting `eulalie` on top without any luck. Maybe the dependency path length is taken into account? | 2017-11-09T14:02:15.000431 | Laurette |
clojurians | clojure | hmm - that could be | 2017-11-09T14:02:53.000403 | Margaret |
clojurians | clojure | Okay. Anyway, thanks for the pointer. I ended up adding an explicit dependency to `prismatic/schema "1.1.7"`, and I’ll ask the bidi project to bump the version | 2017-11-09T14:03:40.000191 | Laurette |
clojurians | clojure | Hi. I have a problem with HugSQL used with Postgres (`[com.layerware/hugsql "0.4.7"]`, `[org.postgresql/postgresql "42.1.3"]`).
This code:
```
(try
(db/persist-job-invocation data)
(catch java.sql.SQLException e
(println "=================== caught java.sql.SQLException")
(println (type e))
(println (type (.getCause e)))
(println "==================="))
(catch Exception e
(println "=================== caught Exception")
(println (type e))
(println (type (.getCause e)))
(println "===================")))
```
throws a useful SQL exception wrapped in a useless java.lang.Exception.
```
=================== caught Exception
java.lang.Exception
java.sql.BatchUpdateException
===================
```
How to catch the real wrapped exception? Do I have to unwrap and raise the exception each time I call a HugSQL-generated DB function? | 2017-11-09T15:13:34.000175 | Lino |
clojurians | clojure | <@Lino> Take a look at the stacktrace and see what code is wrapping the exception. I _thought_ that `clojure.java.jdbc` made sure to throw bare `java.sql.SQLExceptions` wherever it could, so maybe HugSQL is catching and rewrapping it? | 2017-11-09T15:24:49.000438 | Daniell |
clojurians | clojure | HugSQL does this in the generated DB functions:
```
(catch Exception e
(adapter/on-exception a e))))))))
```
The default adapter method:
```
(on-exception [this exception]
(throw exception)))
```
Could this cause it?
(I'll reproduce it and get an exception in a sec) | 2017-11-09T15:26:30.000207 | Lino |
clojurians | clojure | <https://gist.github.com/not-raspberry/413fc99d5cc352f402770355a95568a7> | 2017-11-09T15:36:57.000128 | Lino |
clojurians | clojure | > Caused by: java.lang.Exception: Exception in :persist-job-invocation
So it looks like that's hugsql. | 2017-11-09T15:37:29.000066 | Lino |
clojurians | clojure | Found the issue in conman. <https://github.com/luminus-framework/conman/issues/44> | 2017-11-09T15:40:38.000065 | Lino |
clojurians | clojure | Downgrading conman helped. | 2017-11-09T15:45:17.000228 | Lino |
clojurians | clojure | does anyone know if Juxt's Clojure radar is geting an update? [ 2016 versoin: <https://juxt.pro/radar.html>] | 2017-11-09T16:02:26.000115 | Antonietta |
clojurians | clojure | Is there any way to adjust the `:tag` metadata on a local binding? | 2017-11-09T16:43:02.000072 | Delois |
clojurians | clojure | ```
(defn len [x]
(let [x (vary-meta x assoc :tag String)]
(.length x)))
```
still produces a reflection warning. | 2017-11-09T16:43:24.000220 | Delois |
clojurians | clojure | do you mean the fn arg or the let binding? | 2017-11-09T16:43:59.000090 | Guillermo |
clojurians | clojure | for the latter I write `(let [^String x .......] ........)` | 2017-11-09T16:44:50.000357 | Guillermo |
clojurians | clojure | Either, really - in this case I’m trying to use the let binding to adjust the meta on the fn arg. | 2017-11-09T16:44:50.000675 | Delois |
clojurians | clojure | Yeah - thinking about it, what I’m trying to do doesn’t make sense. | 2017-11-09T16:45:06.000081 | Delois |
clojurians | clojure | it needs to go on the left-hand-side...the way you have it written it is tagged at runtime, not at compile time | 2017-11-09T16:45:36.000581 | Guillermo |
clojurians | clojure | I was hoping to be able to calculate the tag value at runtime, but of course that affects compilation. | 2017-11-09T16:45:41.000157 | Delois |
clojurians | clojure | yeah you can't dynamically modify at runtime without reflection. | 2017-11-09T16:46:01.000458 | Guillermo |
clojurians | clojure | I was up both late and early, is my excuse. | 2017-11-09T16:46:02.000090 | Delois |
clojurians | clojure | lol. welcome to NZ | 2017-11-09T16:46:08.000034 | Guillermo |
clojurians | clojure | Lein 2.8.0 switched Aether to a new version which has moved from Sonatype to Eclipse | 2017-11-09T16:46:52.000387 | Delois |
clojurians | clojure | So all the package names of the classes have changed. | 2017-11-09T16:47:04.000316 | Delois |
clojurians | clojure | Even though the code is basically the same. | 2017-11-09T16:47:16.000614 | Delois |
clojurians | clojure | Just trying to figure out the best way to handle that. | 2017-11-09T16:47:30.000484 | Delois |
clojurians | clojure | hi guys | 2017-11-09T16:49:46.000007 | Mallory |
clojurians | clojure | which is better?
(-> ll rest butlast butlast)
or
(subvec ll 1 (-> ll count dec dec)) | 2017-11-09T16:50:50.000592 | Mallory |
clojurians | clojure | or if there is something better than both please refer it? | 2017-11-09T16:51:10.000032 | Mallory |
clojurians | clojure | <@Mallory> subvec should perform quite better, assuming II is a vector | 2017-11-09T16:54:37.000043 | Kristy |
clojurians | clojure | subvec surely leverages structural sharing, my guess is it's an instant operation | 2017-11-09T16:55:17.000342 | Kristy |
clojurians | clojure | `(-> v pop pop rest)` | 2017-11-09T16:55:35.000417 | Guillermo |
clojurians | clojure | (or subvec) | 2017-11-09T16:55:45.000468 | Guillermo |
clojurians | clojure | `butlast` is linear | 2017-11-09T16:55:56.000071 | Guillermo |
clojurians | clojure | like `last` | 2017-11-09T16:56:00.000313 | Guillermo |
clojurians | clojure | thanks guys | 2017-11-09T16:57:02.000351 | Mallory |
clojurians | clojure | another question | 2017-11-09T17:03:01.000238 | Mallory |
clojurians | clojure | what is the best way to for ["hello" "world"] to swap first two characters in this list to get ["ehllo" "owrld"] ? | 2017-11-09T17:03:50.000639 | Mallory |
clojurians | clojure | i can do it in ugly way | 2017-11-09T17:04:28.000641 | Mallory |
clojurians | clojure | like: | 2017-11-09T17:04:30.000512 | Mallory |
clojurians | clojure | (mapv (fn [w] (let [l (vec w) tmp (get l 0)] (-> l (assoc 0 (get l 1)) (assoc 1 tmp) )) ["hello" "world"]) | 2017-11-09T17:06:34.000051 | Mallory |
clojurians | clojure | i feel it's ugly way to do this | 2017-11-09T17:06:42.000515 | Mallory |
clojurians | clojure | is there elegant way to this? | 2017-11-09T17:06:50.000574 | Mallory |
clojurians | clojure | that's exactly i have | 2017-11-09T17:13:01.000269 | Mallory |
clojurians | clojure | (->> ["hello" "world"] (mapv (fn [w] (let [l (vec w) tmp (get l 0)] (-> l (assoc 0 (get l 1)) (assoc 1 tmp))))) (mapv #(apply str %))) | 2017-11-09T17:13:03.000379 | Mallory |
clojurians | clojure | ```(->> ["hello" "world" ""]
(map (fn [w]
(let [split-index (min (count w)
2)]
(str
(apply str (reverse (subs w 0 split-index)))
(subs w split-index))))))``` | 2017-11-09T17:19:48.000138 | Jonas |
clojurians | clojure | <@Jonas> what makes your version more elegant ? | 2017-11-09T17:21:59.000159 | Mallory |
clojurians | clojure | it depends on who you ask | 2017-11-09T17:22:15.000003 | Jonas |
clojurians | clojure | i want your prespective | 2017-11-09T17:22:32.000320 | Mallory |
clojurians | clojure | I prefer this way of writing it because I think it emphasizes what you’re trying to do | 2017-11-09T17:22:46.000163 | Jonas |
clojurians | clojure | what makes my version is less elegant in your prespective ? | 2017-11-09T17:23:10.000335 | Mallory |
clojurians | clojure | the fact that you’re swapping letters is a little harder to see | 2017-11-09T17:24:11.000499 | Jonas |
clojurians | clojure | and the fact that you’re using assoc and manipulating vectors makes it harder to tell you’re doing string manipulation | 2017-11-09T17:24:47.000049 | Jonas |
clojurians | clojure | another try is ```(->> ["hello" "world" ""]
(map (fn [[first-letter second-letter & other-letters]]
(apply str second-letter first-letter other-letters))))``` | 2017-11-09T17:25:04.000008 | Jonas |
clojurians | clojure | yeah last version is better for me | 2017-11-09T17:25:33.000018 | Mallory |
clojurians | clojure | which matches your problem description a little more closely | 2017-11-09T17:25:38.000153 | Jonas |
clojurians | clojure | the `reverse` in my first version is a little closer to the “swap” part of “swap the first two characters” | 2017-11-09T17:27:13.000456 | Jonas |
clojurians | clojure | > what is the best way to for ["hello" "world"] to swap first two characters in this list to get ["ehllo" "owrld"] ?
also worth nothing that what you really care about is the string function. dealing with vectors is trivial and a separate concern
by reducing problems to their essence, you get to think more clearly :slightly_smiling_face: | 2017-11-09T17:27:20.000260 | Kristy |
clojurians | clojure | the other thing I would consider is that in <@Mallory>’s example, the “swapping the first two letters” gets split up into two pieces | 2017-11-09T17:28:35.000544 | Jonas |
clojurians | clojure | first the swap and then turning it back into a string | 2017-11-09T17:28:44.000539 | Jonas |
clojurians | clojure | so even if you were going to do it that way, I would combine both pieces into one function since I think of swapping the first two letters of a string as one operation | 2017-11-09T17:29:30.000091 | Jonas |
clojurians | clojure | like ```(->> ["hello" "world"]
(mapv (fn [w]
(let [l (vec w)
tmp (get l 0)]
(-> l
(assoc 0 (get l 1))
(assoc 1 tmp)
(->> (apply str)))))))``` | 2017-11-09T17:30:14.000046 | Jonas |
clojurians | clojure | the other point I would make is that `tmp` isn’t very descriptive | 2017-11-09T17:31:48.000583 | Jonas |
clojurians | clojure | just using good names can help readability a lot imo ```(->> ["hello" "world"]
(mapv (fn [w]
(let [l (vec w)
first-letter (first l)
second-letter (second l)]
(-> l
(assoc 0 second-letter)
(assoc 1 first-letter)
(->> (apply str)))))))``` | 2017-11-09T17:33:58.000048 | Jonas |
clojurians | clojure | <@Jonas> as a suggestion, you can replace that let block with `(let [[first-letter second-letter] w] ...)` | 2017-11-09T17:35:30.000084 | Margaret |
clojurians | clojure | oh, you need it to be a vector never mind | 2017-11-09T17:36:08.000233 | Margaret |
clojurians | clojure | `(let [[first-letter second-letter & trailing] w] (apply str second-letter first-letter trailing))` | 2017-11-09T17:37:07.000175 | Margaret |
clojurians | clojure | one of my snippets above is very similar to that one | 2017-11-09T17:37:25.000282 | Jonas |
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