Hi folks! Could you recommend a decent Clojure project with good code, where you could learn by reading the code? I mean, documentation is ok, but in practice, there is a lot of tricks and various "meta" knowledge, like: project structure, initialization code, configuration, logging, tests, docstrings, code conventions, idioms and tricks. To me, the best way to learn these things is by example, that is, to read some good code. So I'm seeking for a project with clean code that I could just browse and learn there. Any suggestions?

i really like https://github.com/clojure/clojure/blob/master/src/clj/clojure/java/io.clj

tasteful protocols, extending to java types, defmethods, etc

A JDBC-related question: When I pass a Timestamp as a parameter into a query, I get it back as a string:

["select ?" (new java.sql.Timestamp 1571300133993)]
({:?column? "2019-10-17 11:15:33.993000+03"})

Is there is an option to get it back as instance of a Date/Timestamp/etc class?

Actually, I’ve figured out using PGObject:

(doto (new PGobject)
      (.setType "timestamp")
      (.setValue "2019-10-17 11:25:29.299563+03"

A basic sanity check question question:

Why is (Math/sin Math/PI) not zero?

Have a look at the Javadoc @nhlx2 - you are only guaranteed a result within 1 ulp of the actual result

I need to call this constructor from Clojure: https://github.com/michel-kraemer/citeproc-java/blob/1d5bf0e7bbb2bdc47309530babf0ecaba838bf10/citeproc-java/src/main/java/de/undercouch/citeproc/ListItemDataProvider.java#L38

I have a vec of CSLItemData. I convert them to an array using (into-array CSLItemData the-vec) and pass that to the constructor. but I still get a reflection warning. how to avoid it?

got it:

(ListItemDataProvider. ^"[Lde.undercouch.citeproc.csl.CSLItemData;" item-datas)

Easiest would be type hinting vec as a java.util.list and not bothering with the array

it's not about vec or array I think but about the inner type

Nah

alright, I'll try the java.util.List - the reflection warning is gone 🙂

Are there alternative ways of doing for's matrix of arguments? Obviously I can use it to just create a vector and pass that wherever, but I was wondering if there was another function which provided some alternative approach? In particular I'm using this with reduce.

Starting to work with seesaw and was wondering if there was some documented set of things i would need to do to make a swing component "behave" with it

org.apache.batik.swing.JSVGCanvas

this is the only one that i am thinking of right now

i know from some slides that there is a Value protocol and listen-for-named-event

but all of that seems to be very much "private" in the sense that how to impl them is opaque (at least to me)

@hiredman thanks for the hint (pun intended!)

Anyone got an idea if there is something in Java/Clojure updates that would break https://github.com/Raynes/bultitude ?

@emil0r there is, it’s broken in later versions of Java iirc

Know of any fix?

I think later versions (0.3.0) use a newer version of dynapath which fixes the issue

https://github.com/tobias/dynapath/blob/master/Changelog.md

Hmmm