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clojurians | clojure | <@Ahmad>: thanks for all your help, on a sunday evening, with debugging this. | 2017-11-05T21:15:18.000001 | Berry |
clojurians | clojure | No problem :) | 2017-11-05T21:19:33.000031 | Ahmad |
clojurians | clojure | Regarding Datomic, I've been struggling with this for an hour or two, please help me out. I'm trying to run a parameterized query, but apparently I'm doing something wrong, does anyone knows why is the first query not returning the entity? I tried to follow the documentation, but it doesn't seems to be working... ;-; I'm also using the Datomic's Client API (<http://docs.datomic.com/clojure-client/index.html>) | 2017-11-05T21:34:27.000049 | Ahmad |
clojurians | clojure | Just pass the value to bind to `?p-username` in `:args`, e.g. just pass `[db "zignd"]` as `:args` | 2017-11-05T22:42:06.000098 | Wenona |
clojurians | clojure | (There is also <#C03RZMDSH|datomic>) | 2017-11-05T22:42:17.000140 | Wenona |
clojurians | clojure | I have tried .size, .length, .-length
how do I get, in O(1) time, the length of a (float-array n) ? | 2017-11-05T23:58:48.000044 | Berry |
clojurians | clojure | <@Berry> acount I think? | 2017-11-06T00:00:40.000108 | Sandy |
clojurians | clojure | nope, `alength` <https://clojuredocs.org/clojure.core/alength> | 2017-11-06T00:01:09.000001 | Sandy |
clojurians | clojure | <https://clojuredocs.org/search?q=acount%20> doesn'ts eem ot exist | 2017-11-06T00:01:28.000015 | Berry |
clojurians | clojure | alength, thanks! | 2017-11-06T00:01:41.000022 | Berry |
clojurians | clojure | arrays are really strange on the JVM, they don't have methods, or fields | 2017-11-06T00:01:57.000112 | Sandy |
clojurians | clojure | So in Java you have to call something to Array/length, and even that I think might be some sort of strange compiler intrinsic | 2017-11-06T00:02:22.000075 | Sandy |
clojurians | clojure | <https://stackoverflow.com/questions/8755812/array-length-in-java> was throwing me off | 2017-11-06T00:02:23.000072 | Berry |
clojurians | clojure | Thank you! It worked! | 2017-11-06T05:12:35.000365 | Ahmad |
clojurians | clojure | I will post there next time | 2017-11-06T05:13:00.000110 | Ahmad |
clojurians | clojure | Can I "append" a pre/post function to a function? | 2017-11-06T09:21:39.000116 | Jutta |
clojurians | clojure | ```
(defn constrained-fn [f x]
{:pre [(pos? x)]
:post [(= % (* 2 x))]}
(f x))
```
:pre and :post assertions | 2017-11-06T09:26:24.000225 | Ahmad |
clojurians | clojure | you mean after the fact? | 2017-11-06T09:35:02.000028 | Willow |
clojurians | clojure | depending on what you mean by append, this might be helpful too <https://github.com/technomancy/robert-hooke> | 2017-11-06T09:35:06.000180 | Shamika |
clojurians | clojure | ```
(defmacro foo [x y]
`(let [^floats ~x ~y]
~x))
(macroexpand-1
'(foo x (float-array 20)))
;; ==> (clojure.core/let [x (float-array 20)] x)
```
It appears my type hint of ^floats is being stripped away.
Is there a way for macros to generate / keep type hints ? | 2017-11-06T10:47:40.000111 | Berry |
clojurians | clojure | [ I need to keep type hints as I end up using primitive math. ] | 2017-11-06T10:47:55.000505 | Berry |
clojurians | clojure | found answer: <https://stackoverflow.com/questions/11919602/generating-clojure-code-with-type-hints> | 2017-11-06T10:52:06.000116 | Berry |
clojurians | clojure | Is there a more updated view of definline ?
<http://bytopia.org/2014/07/07/inline-functions-in-clojure/> | 2017-11-06T10:59:19.000288 | Berry |
clojurians | clojure | Probably not, but is there something in key destructuring that lets you rename the keys in one go as you destructure them? | 2017-11-06T11:14:47.000514 | Johana |
clojurians | clojure | yes. | 2017-11-06T11:15:39.000693 | Jodie |
clojurians | clojure | ```
{new-name :old-name}
``` | 2017-11-06T11:16:00.000225 | Jodie |
clojurians | clojure | Is anyone here using the s3-private-wagon plugin with Leiningen 2.7.1 on Java 1.8? I’m getting authentication errors when using the plugin and running `lein deps`; however, when I run the `aws` cli tool, I’m able to retrieve objects from the private bucket. | 2017-11-06T11:16:07.000360 | Sadye |
clojurians | clojure | It seems s3-private-wagon isn’t retrieving the EC2 instance profile credentials | 2017-11-06T11:16:50.000395 | Sadye |
clojurians | clojure | ```
jenkins@ip-10-110-61-60:~/workspace/movr3-api-dev$ lein deps
Could not transfer artifact wardrobe:wardrobe:pom:0.1.3 from/to releases (<s3p://artifacts-prd.pnmac.com/releases/>): Access Denied (Service: Amazon S3; Status Code: 403; Error Code: AccessDenied; Request ID: AA5EF73EDF617F8E)
This could be due to a typo in :dependencies or network issues.
If you are behind a proxy, try setting the 'http_proxy' environment variable.
jenkins@ip-10-110-61-60:~/workspace/movr3-api-dev$ cd ../../.m2/repository/wardrobe/wardrobe/0.1.3/
jenkins@ip-10-110-61-60:~/.m2/repository/wardrobe/wardrobe/0.1.3$ aws s3 sync <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/> .
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.jar.sha1> to ./wardrobe-0.1.3.jar.sha1
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.pom> to ./wardrobe-0.1.3.pom
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.jar> to ./wardrobe-0.1.3.jar
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.pom.sha1> to ./wardrobe-0.1.3.pom.sha1
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.jar.md5> to ./wardrobe-0.1.3.jar.md5
download: <s3://artifacts-prd.pnmac.com/releases/wardrobe/wardrobe/0.1.3/wardrobe-0.1.3.pom.md5> to ./wardrobe-0.1.3.pom.md5
jenkins@ip-10-110-61-60:~/.m2/repository/wardrobe/wardrobe/0.1.3$
``` | 2017-11-06T11:18:06.000383 | Sadye |
clojurians | clojure | <@Johana> <https://clojure.org/guides/destructuring#_associative_destructuring> | 2017-11-06T11:18:30.000386 | Jodie |
clojurians | clojure | <@Jodie> I mean something like this:
```
(let [{:keys [x y]} {:x 1 :y 2}
original-x x
original-y y
{:keys [x y]} {:x 2 :y 3}
new-x x
new-y y]
{:x (+ original-x new-x)
:y (+ original-y new-y)})
```
where I want to assign the destructured `x` directly to the intended name | 2017-11-06T11:19:55.000335 | Johana |
clojurians | clojure | Ah, that is what `{new-name :old-name}` can do, I see | 2017-11-06T11:21:05.000055 | Johana |
clojurians | clojure | By the way, I’m using version 1.3.0 of s3-private-wagon | 2017-11-06T11:21:08.000034 | Sadye |
clojurians | clojure | ```
(let [{original-x :x original-y :y} {:x 1 :y 2}
{new-x :x new-y :y} {:x 2 :y 3}]
{:x (+ original-x new-x)
:y (+ original-y new-y)})
``` | 2017-11-06T11:22:37.000217 | Johana |
clojurians | clojure | cool | 2017-11-06T11:22:38.000411 | Johana |
clojurians | clojure | <https://github.com/s3-wagon-private/s3-wagon-private/issues/18> It seems this has already been solved as of version 1.3.0 | 2017-11-06T11:22:53.000118 | Sadye |
clojurians | clojure | You may want to try leiningen 2.8.1 <@Sadye>, I know some attention went into updating s3-private-wagon | 2017-11-06T11:23:01.000398 | Guillermo |
clojurians | clojure | Actually the first time I needed this renaming :slightly_smiling_face: | 2017-11-06T11:23:09.000505 | Johana |
clojurians | clojure | Not sure it handles your issue, but it does appear that related issues have been closed upstream | 2017-11-06T11:23:37.000164 | Guillermo |
clojurians | clojure | <@Guillermo> Thanks for the tip! I’ll give that a try | 2017-11-06T11:24:10.000386 | Sadye |
clojurians | clojure | ```
Could not find artifact wardrobe:wardrobe:jar:0.1.3 in central (<https://repo1.maven.org/maven2/>)
Could not find artifact wardrobe:wardrobe:jar:0.1.3 in clojars (<https://repo.clojars.org/>)
Could not transfer artifact wardrobe:wardrobe:jar:0.1.3 from/to releases (<s3p://artifacts-prd.pnmac.com/releases/>): Access key cannot be null.
Could not transfer artifact wardrobe:wardrobe:jar:0.1.3 from/to snapshots (<s3p://artifacts-prd.pnmac.com/snapshots/>): Access key cannot be null.
Could not transfer artifact wardrobe:wardrobe:pom:0.1.3 from/to releases (<s3p://artifacts-prd.pnmac.com/releases/>): Access key cannot be null.
This could be due to a typo in :dependencies, file system permissions, or network issues.
If you are behind a proxy, try setting the 'http_proxy' environment variable.
``` | 2017-11-06T11:29:30.000685 | Sadye |
clojurians | clojure | I’m getting a similar error with the upgrade to Lein 2.8.1. I’m going to try Lein 2.8.0 next | 2017-11-06T11:29:58.000889 | Sadye |
clojurians | clojure | you're getting a much better error message now | 2017-11-06T11:30:48.000384 | Guillermo |
clojurians | clojure | `Access key cannot be null` | 2017-11-06T11:30:59.000369 | Guillermo |
clojurians | clojure | Might want to ask in <#C09N0H1RB|aws> <@Sadye> -- usually for IAM instance profiles you don't have to do anything | 2017-11-06T11:34:31.000182 | Guillermo |
clojurians | clojure | ```
(defmacro ifor [[i start end] & body]
`(let [start# (long ~start)
end# (long ~end)]
(loop [~i start#]
(when (p/< ~i end#)
~@body
(recur (unchecked-inc ~i))))))
(defmacro iproc [expr [data i v] & body]
`(let [~data ~expr]
(ifor [~i 0 (alength ~data)]
(let [~v (aget ^floats ~data ~i)]
~@body))))
(def x (float-array (* 1000 100)))
(cc/quick-bench
(ifor [i 0 (alength x)]
(aset ^floats x i (float i))))
Evaluation count : 3276 in 6 samples of 546 calls.
Execution time mean : 183.588777 µs
Execution time std-deviation : 923.219982 ns
Execution time lower quantile : 182.996929 µs ( 2.5%)
Execution time upper quantile : 185.164436 µs (97.5%)
Overhead used : 1.962587 ns
(cc/quick-bench
(let [^long end (alength x)]
(loop [i 0]
(when (p/< i end)
(aset ^floats x i (float i))
(recur (unchecked-inc i))))))
Evaluation count : 2412 in 6 samples of 402 calls.
Execution time mean : 248.133557 µs
Execution time std-deviation : 926.589005 ns
Execution time lower quantile : 247.272398 µs ( 2.5%)
Execution time upper quantile : 249.071233 µs (97.5%)
Overhead used : 1.962587 ns
(cc/quick-bench
(iproc x [x i v]
(aset ^floats x i (float i))))
Evaluation count : 6 in 6 samples of 1 calls.
Execution time mean : 1.121665 sec
Execution time std-deviation : 70.439931 ms
Execution time lower quantile : 1.067037 sec ( 2.5%)
Execution time upper quantile : 1.206947 sec (97.5%)
Overhead used : 1.962587 ns
``` | 2017-11-06T12:19:44.000410 | Berry |
clojurians | clojure | any idea why the running time increases ? I would expect the three to be about the same | 2017-11-06T12:20:04.000584 | Berry |
clojurians | clojure | your type hint in iproc isn't doing what you think it's doing | 2017-11-06T12:23:20.000010 | Kareen |
clojurians | clojure | should I be doing
``` (aget ~(vary-meta data assoc :tag 'floats) ~i) ``` | 2017-11-06T12:23:48.000138 | Berry |
clojurians | clojure | use `~(with-meta data {:tag 'floats})` instead | 2017-11-06T12:23:48.000460 | Kareen |
clojurians | clojure | i have a question about idiomatic application architecture — i’m writing a server application with a series of modules acting as various services; my thinking now is that i can wrap the important state to each module in an atom and then connect each module w/ `core.async` channels to pass messages around as various events come into the top-level port | 2017-11-06T12:28:20.000340 | Venessa |
clojurians | clojure | does anyone have any feedback on this plan? or a better suggestion for structuring the software? i’m used to the situation in Go where i can just connect all the modules w/ channels to pass messages around; what i’m used to doing in clojure for concurrency is using atoms and i’m trying to resolve the two approaches | 2017-11-06T12:29:17.000512 | Venessa |
clojurians | clojure | <@Venessa> I would caution against that architecture unless you specifically know you need concurrency already | 2017-11-06T12:29:53.000033 | Aldo |
clojurians | clojure | is that basically the erlang / actor model ? | 2017-11-06T12:30:22.000041 | Berry |
clojurians | clojure | <@Kareen> :
```
(defmacro ifor [[i start end] & body]
`(let [start# (long ~start)
end# (long ~end)]
(loop [~i start#]
(when (p/< ~i end#)
~@body
(recur (unchecked-inc ~i))))))
(defmacro iproc [expr [data i v] & body]
`(let [~(vary-meta data assoc :tag 'floats) ~expr]
(ifor [~i 0 (alength ~data)]
(let [~v (aget ~(vary-meta data assoc :tag 'floats) ~i)]
~@body))))
(do
(def x (float-array (* 1000 1000)))
(println "\n\n\n\n\n")
(println "=====")
(cc/quick-bench
(ifor [i 0 (alength x)]
(aset ^floats x i (float i))))
(cc/quick-bench
(iproc x [x i v]
(aset ^floats x i (float i)))))
=====
Evaluation count : 360 in 6 samples of 60 calls.
Execution time mean : 1.680640 ms
Execution time std-deviation : 3.250002 µs
Execution time lower quantile : 1.677290 ms ( 2.5%)
Execution time upper quantile : 1.685090 ms (97.5%)
Overhead used : 1.962587 ns
Evaluation count : 456 in 6 samples of 76 calls.
Execution time mean : 1.324811 ms
Execution time std-deviation : 255.773342 ns
Execution time lower quantile : 1.324424 ms ( 2.5%)
Execution time upper quantile : 1.324963 ms (97.5%)
Overhead used : 1.962587 ns
```
not complaining at all -- iproc is now faster than ifor, weird | 2017-11-06T12:30:59.000659 | Berry |
clojurians | clojure | ok great <@Aldo> i’m working on a bitcoin node — messages from peers will end up going to one module and then that will have downstream effects to some other modules | 2017-11-06T12:31:09.000597 | Venessa |
clojurians | clojure | ^ <@Berry> | 2017-11-06T12:31:22.000427 | Venessa |
clojurians | clojure | i’m wondering what the best way to do this in clojure is | 2017-11-06T12:31:32.000470 | Venessa |
clojurians | clojure | I don't know enough about erland/actor model to comment on that. you absolutely can set up an app where you have components that own little worker threads and the components talk to each other via channels. I've written apps like that. almost all of them i either have or wish I had gone back and rewritten them in a more functional way | 2017-11-06T12:32:10.000144 | Aldo |
clojurians | clojure | to reinforce <@Aldo>’s point: I've found core.async hard to debug (both stack traces and reasoning about it) -- and found it's much simpler to take the FRP / reagent model /reactive atom route | 2017-11-06T12:33:10.000303 | Berry |
clojurians | clojure | turns out it's hard to predict which parts of your app will benefit from asynchronous programming :slightly_smiling_face: | 2017-11-06T12:33:31.000181 | Aldo |
clojurians | clojure | now when I use core.async I prefer to keep it in one namespace that wires everything together. gives you one place to read/understand your asynchronous algorithm and one place to vary the number of threads for the different parts etc | 2017-11-06T12:34:29.000291 | Aldo |
clojurians | clojure | ok thanks <@Aldo> <@Berry> | 2017-11-06T12:37:57.000276 | Venessa |
clojurians | clojure | <@Venessa> - That sounds to me like a use case that Storm is designed to solve. However, I'm speaking from relative ignorance here on both the application architecture and Storm itself, so take that with a grain of salt. <http://www.storm-project.net/> | 2017-11-06T12:42:34.000242 | Adelaida |
clojurians | clojure | thanks! seems a little like overkill | 2017-11-06T12:43:05.000213 | Venessa |
clojurians | clojure | for me now | 2017-11-06T12:43:09.000469 | Venessa |
clojurians | clojure | I may try putting all the state in a single atom | 2017-11-06T12:56:12.000314 | Venessa |
clojurians | clojure | There will just be a little overhead for each module to only get the pieces it wants | 2017-11-06T12:56:34.000397 | Venessa |
clojurians | clojure | It might also be overkill, but you could take a look at Onyx. It's written in clojure and will handle things like state for your modules and has a clear model for describing how the data flows between your tasks. | 2017-11-06T12:56:46.000530 | Cecile |
clojurians | clojure | Thanks | 2017-11-06T12:56:56.000400 | Venessa |
clojurians | clojure | Anyone use anything like lenses? | 2017-11-06T12:57:10.000583 | Venessa |
clojurians | clojure | Zippers etc | 2017-11-06T12:57:20.000177 | Venessa |
clojurians | clojure | look into Specter | 2017-11-06T12:57:38.000595 | Cecile |
clojurians | clojure | Ah right | 2017-11-06T12:58:21.000245 | Venessa |
clojurians | clojure | I think that will help if I go with one big ball of state approach | 2017-11-06T12:58:33.000432 | Venessa |
clojurians | clojure | Each module can define a lens over the substate it cares about and a single atom can handle concurrent writes | 2017-11-06T12:59:34.000327 | Venessa |
clojurians | clojure | Does anyone have any suggestions on writing maintainable accessors with specter? | 2017-11-06T13:00:21.000630 | Venessa |
clojurians | clojure | Can I avoid having to re-write all my accessors if the shape of the state changes? | 2017-11-06T13:00:55.000591 | Venessa |
clojurians | clojure | onyx/storm are great, but I don't think they're really related to the problem here | 2017-11-06T13:00:59.000816 | Aldo |
clojurians | clojure | Agreed | 2017-11-06T13:01:06.000137 | Venessa |
clojurians | clojure | This is p simple and I just want well factored code | 2017-11-06T13:01:21.000089 | Venessa |
clojurians | clojure | If you just go with a single key per module, you probably won't need lenses. Although that's assuming each module has its own subsection rather than different modules needing state from different pieces. | 2017-11-06T13:01:42.000386 | Cecile |
clojurians | clojure | <@Venessa> specter is probably helpful here. but if you have lots of different functions mutating things then you're not writing very clojurey code | 2017-11-06T13:01:52.000140 | Aldo |
clojurians | clojure | humble suggestion: write functions that take data and return data :slightly_smiling_face: | 2017-11-06T13:02:27.000325 | Aldo |
clojurians | clojure | <@Aldo> can you point to an example that shows the difference? | 2017-11-06T13:02:27.000578 | Venessa |
clojurians | clojure | Yeah I guess the issue is going from that to “here is a stream of events that impact various modules” | 2017-11-06T13:03:08.000521 | Venessa |
clojurians | clojure | if at all possible pull state tracking/munging up to the very top level | 2017-11-06T13:03:20.000017 | Aldo |
clojurians | clojure | Yeah I think that is the single top-level atom idea I like | 2017-11-06T13:03:42.000391 | Venessa |
clojurians | clojure | Then depending on what happens each module will need to read/write the state | 2017-11-06T13:04:15.000001 | Venessa |
clojurians | clojure | right, but if you have a single top level atom I would manipulate it only at that top level, ie deref the atom and pass the contents down, not the atom itself. then receive the changes back up the top and modify the atom | 2017-11-06T13:04:23.000336 | Aldo |
clojurians | clojure | Ok that’s a good suggestion | 2017-11-06T13:04:52.000299 | Venessa |
clojurians | clojure | I’ll keep that in mind | 2017-11-06T13:04:57.000111 | Venessa |
clojurians | clojure | Which invariably has me asking — what’s a good way to diff data structures ? | 2017-11-06T13:05:29.000506 | Venessa |
clojurians | clojure | Is this map different from that map, etc | 2017-11-06T13:05:52.000246 | Venessa |
clojurians | clojure | <@Venessa> ```(= {:a 1} {:a 1})
true
(= {:a 1} {:a 2})
false``` | 2017-11-06T13:07:44.000300 | Evan |
clojurians | clojure | Great | 2017-11-06T13:07:49.000308 | Venessa |
clojurians | clojure | so long as you're staying in the good world of immutable clojure data structures then comparing is just `=` ya | 2017-11-06T13:09:55.000397 | Aldo |
clojurians | clojure | hello every one, is there a better way to achieve this?
`(apply str (map str (interpose “, ” [1 2 3 4 5])))` | 2017-11-06T13:11:43.000267 | Amado |
clojurians | clojure | Unless diffing maps is specific to the task... I'd say it's probably bad practice in general. Think more about how the data flows through the system, the output of a pure function should depend on the input, generally not the input + diff against another piece of changing state. | 2017-11-06T13:12:43.000404 | Cecile |
clojurians | clojure | `(clojure.string/join ", " [1 2 3 4 5])` <@Amado> | 2017-11-06T13:12:44.000071 | Evan |
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