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clojurians | clojure | <@Dannette> is *your* project AOT’ed? and if so, have you cleaned? | 2017-10-27T10:15:25.000644 | Sonny |
clojurians | clojure | i guess he's AOTing his project | 2017-10-27T10:15:31.000406 | Kareen |
clojurians | clojure | ah! yes, that was it. Didn't occur to me that AOT could cause this problem :disappointed: | 2017-10-27T10:15:48.000087 | Dannette |
clojurians | clojure | <@Dannette> usually when you're seeing LinkageError/NoSuchMethodError/VerifyError in clojure, it's caused by AOT compilation | 2017-10-27T10:22:18.000164 | Kareen |
clojurians | clojure | Short, probably stupid question:
`(partition 5 5 [\space] "cseerntiofarmit on")`
Why does this not fill the last partition up to 5 elements? Wouldn’t it be supposed to do that when given a pad? | 2017-10-27T11:40:11.000633 | Jon |
clojurians | clojure | >>>In case there are not enough padding elements, return a partition with less than n items. | 2017-10-27T11:42:27.000356 | Evan |
clojurians | clojure | Must have overseen that. Thanks. Is there no simple way to always keep exactly 5 elements and fill the rest with a given pad? | 2017-10-27T11:43:23.000416 | Jon |
clojurians | clojure | `(partition 5 5 (repeat \space) "cseerntiofarmit on")` | 2017-10-27T11:43:35.000656 | Guillermo |
clojurians | clojure | <@Guillermo> there we go :smile: thanks! i forgot about that :confused: still new :smile: | 2017-10-27T11:44:20.000626 | Jon |
clojurians | clojure | this might be a silly question, but is there a way to wipe clean all unknown derivations? something like an `(underive)` that takes no parameters? | 2017-10-27T12:25:24.000611 | Zola |
clojurians | clojure | <@Zola> there’s global-heirarchy | 2017-10-27T12:27:25.000212 | Margaret |
clojurians | clojure | or maybe i should be working with a hierarchy object, store it somewhere, and wipe it when necessary | 2017-10-27T12:27:32.000264 | Zola |
clojurians | clojure | yeah - that’s much cleaner | 2017-10-27T12:27:44.000756 | Margaret |
clojurians | clojure | okay, thanks :slightly_smiling_face: | 2017-10-27T12:27:54.000520 | Zola |
clojurians | clojure | actually using hierarchies isn't exactly well trodden ground | 2017-10-27T12:28:20.000136 | Rebeca |
clojurians | clojure | <@Rebeca> derive, underive, and defmulti all use them - they just default to the global | 2017-10-27T12:28:50.000061 | Margaret |
clojurians | clojure | right | 2017-10-27T12:28:58.000187 | Rebeca |
clojurians | clojure | but even derive and underive on the global hierarchy are not very common | 2017-10-27T12:29:21.000514 | Rebeca |
clojurians | clojure | i think in my 7 years of writing clojure i've used derive twice, never underive | 2017-10-27T12:30:53.000458 | Kareen |
clojurians | clojure | so I am just saying, advice and best practices on using hierarchies(born out from experience) is going to be thin on the ground | 2017-10-27T12:31:51.000100 | Rebeca |
clojurians | clojure | in my scenario i've built a mock file system in the browser from a tabular data source where each row only knows its parent id. when i read in the rows i derive its id with its parent id, and then i can easily grab all descendants without having to mapify or recursively iterate through the rows. | 2017-10-27T12:36:11.000605 | Zola |
clojurians | clojure | it felt quicker and more performant, but i guess it's somewhat stateful as well? | 2017-10-27T12:37:01.000215 | Zola |
clojurians | clojure | sure, definitely | 2017-10-27T12:37:12.000361 | Rebeca |
clojurians | clojure | you are using a hierarchy to get a mutable map | 2017-10-27T12:37:34.000433 | Rebeca |
clojurians | clojure | what could go wrong! | 2017-10-27T12:37:44.000182 | Zola |
clojurians | clojure | you could just use a map in an atom | 2017-10-27T12:37:57.000025 | Rebeca |
clojurians | clojure | (a hierarchy is just a map in a ref, so not all that different implementation wise, but semantics I guess) | 2017-10-27T12:38:58.000482 | Rebeca |
clojurians | clojure | gotcha. it was just an experiment / lazy way to not build and manage a tree myself. in that regards, success. :wink: | 2017-10-27T12:40:04.000549 | Zola |
clojurians | clojure | thanks for the advice guys | 2017-10-27T12:40:10.000652 | Zola |
clojurians | clojure | Is there a way for us to override a protocol implementation on a type coming from a transitive library namespace?. Lets say I am consuming a library and it defined to look at a specific field on a Avro type and I want myself to override that lookup for my own usecase. | 2017-10-27T12:41:13.000367 | Lizabeth |
clojurians | clojure | `extend-protocol` is just a macro around `extend` which is just a function | 2017-10-27T13:32:16.000487 | Jonas |
clojurians | clojure | so if you have the protocol, the type you would like to override, and the implementation, you should be able to just pass that to extend at runtime | 2017-10-27T13:37:27.000086 | Jonas |
clojurians | clojure | <@Jonas> The library already has a extend protocol on the type and I want to make sure for my project my own extend protocol on the same type overrides the implementation coming from the library and moreover the protocol itself is defined in the library. | 2017-10-27T13:53:36.000497 | Lizabeth |
clojurians | clojure | when you say for your own project, does that mean your code will use one implementation and in the same program, the library’s code will use a different implementation for the same protocol? | 2017-10-27T13:55:52.000375 | Jonas |
clojurians | clojure | protocols are not locally bindable like that - there’s only one implementation possible per concrete class | 2017-10-27T14:01:48.000631 | Margaret |
clojurians | clojure | if your implementation is defined later, it replaces a previous definition for that specific class (if it existed) | 2017-10-27T14:02:18.000386 | Margaret |
clojurians | clojure | I want to completely replace the definition. how do I ensure that my implementation is the one that is picked up at runtime? | 2017-10-27T14:03:58.000449 | Lizabeth |
clojurians | clojure | I just tried a dummy example and it looks like you get `IllegalArgumentException class MyType already directly implements interface MyProtocol for protocol` | 2017-10-27T14:04:02.000484 | Jonas |
clojurians | clojure | when you try to replace the implementation | 2017-10-27T14:04:34.000049 | Jonas |
clojurians | clojure | ```
(defprotocol MyProtocol
(f1 [_]))
(defrecord MyType []
MyProtocol
(f1 [_]
1))
(clojure.core/extend MyType
MyProtocol
{:f1 (fn [_]
2)})
``` | 2017-10-27T14:04:45.000004 | Jonas |
clojurians | clojure | but ```(defprotocol MyProtocol
(f1 [_]))
(defrecord MyType []
)
(clojure.core/extend MyType
MyProtocol
{:f1 (fn [_]
1)})
(clojure.core/extend MyType
MyProtocol
{:f1 (fn [_]
2)})``` | 2017-10-27T14:06:30.000310 | Jonas |
clojurians | clojure | works | 2017-10-27T14:06:31.000476 | Jonas |
clojurians | clojure | yea, in the above example, lets say the first extend is in namespace1 and second extend(override) is in namespace2 and a third namespace uses namespace1, namespace2. I don't know if I can guarantee that namespace2 extend is always picked over namespace1. May be there is nothing I can do here but want some input for my usecase. | 2017-10-27T14:09:43.000179 | Lizabeth |
clojurians | clojure | if you wrap your extend in a function, then you can just call it at the top of your `-main` | 2017-10-27T14:13:34.000026 | Jonas |
clojurians | clojure | ```;; namespace 2
(defn do-my-extend! []
(extend MyType
MyProtocol
{:f1 (fn [_]
2)}))
;; main namespace
(defn -main [& args]
(do-my-extend!))``` | 2017-10-27T14:13:38.000014 | Jonas |
clojurians | clojure | the -main will probably run after all the top level code | 2017-10-27T14:14:01.000624 | Jonas |
clojurians | clojure | alternatively, if you have access to the source of the library you’re consuming, it might be worth considering just creating your own fork | 2017-10-27T14:14:27.000559 | Jonas |
clojurians | clojure | Thanks. I will try with the first approach. | 2017-10-27T14:16:09.000433 | Lizabeth |
clojurians | clojure | EDIT: question moved to <#C073DKH9P|re-frame> | 2017-10-27T15:05:06.000377 | Berry |
clojurians | clojure | I want to read and write XML but I see there are `clojure.xml`, `clojure.data.xml` and `clojure.data.zip` to choose from. Does anyone have experience with these? Do they complement each other? | 2017-10-27T15:46:22.000211 | Kyra |
clojurians | clojure | I had to do some xml parsing at some point and ended up using clojure.data.xml. clojure.data.xml can parse lazily. I’m not sure if clojure.xml can also parse lazily and without loading the xml document into memory | 2017-10-27T16:01:42.000144 | Jonas |
clojurians | clojure | seems like clojure.data.xml is a better than clojure.xml option unless you really only need very basic xml parsing functionality | 2017-10-27T16:09:20.000041 | Jonas |
clojurians | clojure | <@Jonas> thanks, I’ll give that a spin :sunglasses: | 2017-10-27T17:24:49.000012 | Kyra |
clojurians | clojure | Does programming shape the way you think? A research project: <https://twitter.com/leraboroditsky/status/924006274852892672> Comments to <#C03RZGPG3|off-topic> , please. | 2017-10-27T18:03:14.000152 | Lucia |
clojurians | clojure | anyone with core.logic experience here? | 2017-10-28T11:56:17.000048 | Isabell |
clojurians | clojure | in particular core.logic.fd | 2017-10-28T11:56:31.000030 | Isabell |
clojurians | clojure | i'm stuck with a relation i'm trying to implement | 2017-10-28T11:59:06.000096 | Isabell |
clojurians | clojure | (map + a b) -> c (where a b and c are lists of ints) | 2017-10-28T11:59:51.000076 | Isabell |
clojurians | clojure | what does it mean by Returns a new coll consisting of to-coll with all of the items of from-coll conjoined? does it iterate over the whole collection or just joining them together? | 2017-10-28T12:00:11.000030 | Anneliese |
clojurians | clojure | <@Anneliese> remember values are immutable, so you'll receive a new collection with all items conjoined. | 2017-10-28T12:24:20.000072 | Bibi |
clojurians | clojure | There's more detail "under the covers" but you can think of this as a "copy" of the to-coll and from-coll conj'ed into a 3rd collection. | 2017-10-28T12:25:31.000108 | Bibi |
clojurians | clojure | Well, conj of course doesn't join 2 collections, so excuse that part of my explanation. | 2017-10-28T12:27:43.000057 | Bibi |
clojurians | clojure | Still you'll have a copy, and the original from-coll is still the same. | 2017-10-28T12:28:57.000001 | Bibi |
clojurians | clojure | What explanation are you referring to in your original question? | 2017-10-28T12:29:42.000061 | Bibi |
clojurians | clojure | <@Anneliese>if i'm not mistaken you're asking about `into`, which does `(reduce conj to from)`, so it does iterate | 2017-10-28T13:16:01.000054 | Evan |
clojurians | clojure | Is anyone using dire error handling? How does it work with multimethods? | 2017-10-28T14:26:42.000069 | Lesia |
clojurians | clojure | Which library do you use to connect a Clojure app to a relational database? | 2017-10-28T17:47:59.000007 | Mina |
clojurians | clojure | I'm surprised when I see anything other than clojure.java.jdbc used to connect / communicate, but there are many options for DSLs that construct queries | 2017-10-28T17:49:10.000071 | Margaret |
clojurians | clojure | I like hugsql together with conman. | 2017-10-28T17:51:40.000067 | Elwanda |
clojurians | clojure | <https://www.hugsql.org/> | 2017-10-28T17:51:54.000069 | Elwanda |
clojurians | clojure | <https://github.com/luminus-framework/conman> | 2017-10-28T17:52:19.000049 | Elwanda |
clojurians | clojure | <@Margaret> do you write strings for your queries? | 2017-10-28T17:54:52.000069 | Mina |
clojurians | clojure | no, but I'm 100% certain you shouldn't use the query generating library I use | 2017-10-28T17:55:35.000036 | Margaret |
clojurians | clojure | I don't get it, from your answer I realized you are using `jdbc` | 2017-10-28T17:57:30.000057 | Mina |
clojurians | clojure | jdbc is not a query generator, it's a connection library, which is what your question asked for | 2017-10-28T17:57:50.000031 | Margaret |
clojurians | clojure | Any preferences for a library to manage and handle queries and transactions? From the OOP world, something like an ORM? | 2017-10-28T17:59:53.000079 | Mina |
clojurians | clojure | <@Mina> Since there are no "objects" in Clojure, there's no need for ORM. `clojure.java.jdbc` is the "standard" contrib library for JDBC work -- `[org.clojure/java.jdbc "0.7.3"]` is the latest version -- <https://github.com/clojure/java.jdbc/> -- community documentation <http://clojure-doc.org/articles/ecosystem/java_jdbc/home.html> | 2017-10-28T19:36:49.000077 | Daniell |
clojurians | clojure | (disclaimer: I maintain this library) | 2017-10-28T19:37:11.000080 | Daniell |
clojurians | clojure | That library "handles queries and transactions". You have a hash map you want stored in a table? `(jdbc/insert! db-spec :table my-hash-map)` Simple as that. | 2017-10-28T19:38:29.000070 | Daniell |
clojurians | clojure | If you want transactions over multiple operations: ```(jdbc/with-db-transaction [conn db-spec]
(jdbc/insert! conn :table my-data)
(jdbc/insert! conn :other-table more-data))``` | 2017-10-28T19:40:03.000073 | Daniell |
clojurians | clojure | If you want a DSL for composing SQL queries, I highly recommend `honey-sql` (linked from the community documentation above). | 2017-10-28T19:41:40.000023 | Daniell |
clojurians | clojure | <@Mina> If you really want something ORM-like in Clojure, check out Korma (also linked from the community documentation above). I thought it had stopped being maintained a long time ago but it appears to have a new maintainer... My experience has been that people quickly run into limitations with Korma and end up dropping it. YMMV. | 2017-10-28T19:44:53.000045 | Daniell |
clojurians | clojure | For small and specifically performance-sensitive sections in a program, is it possible to write "imperative with local mutable variables" style code using Clojure? In other words, is it possible to "write Java in Clojure"? The closest thing I could find were volatiles, and those are still one extra layer of boxing, right? | 2017-10-28T21:10:20.000014 | Araceli |
clojurians | clojure | For what it's worth, I understand this goes heavily against the idioms of Clojure in the standard case. | 2017-10-28T21:11:24.000038 | Araceli |
clojurians | clojure | <@Araceli>, if you're thinking of writing "Java in Clojure", why not just write the Java code and call that? What I mean is, Java's a very good Java, if that's what you want :slightly_smiling_face: | 2017-10-28T21:27:01.000006 | Bibi |
clojurians | clojure | you can write “java in clojure” | 2017-10-28T21:28:08.000046 | Jonas |
clojurians | clojure | <@Bibi> Yes, that's the other option. Mainly, the benefit from a theoretical "Java in Clojure" would be locality/organization of the source files, for whatever that's worth. | 2017-10-28T21:28:18.000001 | Araceli |
clojurians | clojure | depending on how much performance you need to eek out | 2017-10-28T21:28:48.000032 | Jonas |
clojurians | clojure | most of the code I’ve seen that focuses on performance talks about type hints to avoid reflection which is one of the slower parts | 2017-10-28T21:29:42.000030 | Jonas |
clojurians | clojure | <@Jonas> I'm looking for on-par with writing regular imperative Java. Which is to say, I need mutable locals in an unboxed form. | 2017-10-28T21:30:00.000062 | Araceli |
clojurians | clojure | are you creating lots of volatiles? | 2017-10-28T21:30:16.000018 | Jonas |
clojurians | clojure | Yes, and using things like transient collections, as long as they don't leak outside the function. | 2017-10-28T21:30:36.000005 | Bibi |
clojurians | clojure | you may be able to create them once and reuse them, depending on the context | 2017-10-28T21:30:37.000004 | Jonas |
clojurians | clojure | For now, it's purely hypothetical. I want to know if I have this option available before I get into it. | 2017-10-28T21:30:44.000045 | Araceli |
clojurians | clojure | Because, whether I do or don't have this option available will probably change what I do. | 2017-10-28T21:31:14.000027 | Araceli |
clojurians | clojure | because other than creation, I think it’s the same as just regular java mutation | 2017-10-28T21:31:18.000001 | Jonas |
clojurians | clojure | Can you be more clear by what you mean with "write Java in Clojure" though? There's a wide scope of what it *could* mean. | 2017-10-28T21:32:27.000082 | Bibi |
clojurians | clojure | <@Bibi> Say I take a generic computer algorithms textbook. It has well-known algorithms in a form that can be translated near-verbatim into Java, same as any other traditional imperative language. If I wanted to do the same for Clojure, and maintain Java-level performance, my (admittedly limited) understanding is that I would need mutable locals. | 2017-10-28T21:34:13.000044 | Araceli |
clojurians | clojure | I see. I haven't tried (at least on purpose) to program imperatively in Clojure having spent so much energy to leave Java behind :slightly_smiling_face: I can't think of anything beyond mutability you'd need, it seems all flow control mechanisms are there. | 2017-10-28T21:37:59.000062 | Bibi |
clojurians | clojure | For the most part, I try to learn and write idiomatic Clojure. But for that low-single-digit percent of code that needs it, I'm exploring options for getting Java-level performance. | 2017-10-28T21:39:05.000040 | Araceli |
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