is there a builtin for (defn avg [lst] (/ (apply + lst) (count lst))) ?

not in core

@qqq average is defined in incanter.stats (mean)

Hi guys. I am trying to run-all-tests of my lein project in a repl. I'd need to load/require all my test namespaces, so that I could run them with (run-all-tests #"mynamespace.*"). Is there a similar way to load/require all the test namespaces by a project-specific package regex? Thanks

@andras.liter you could create a namespace that requires all the namespaces you want to test

is there a reason why you don't use lein test from the command line ?

thanks @fmind, I am looking for fast feedback loops for test development with Eclipse, and lein test is incredibly slow (to run on each small change), thus want to have a repl running

in that case, you ca simply create a namespace that loads all the others you want to test

yes, will try that - hoping that listing all test namespaces there & run-all-tests then results in the same outcome as running lein test in cmdline and on our build server

is there a way to have assoc stay with array maps even when they grow past size 10 without switching to a third party implementation? i.e. assoc switches to PersistentHashMap from PersistentArrayMap when the maps become large enough (> 10) and I need the map to stay ordered

@mbjarland have you tried https://github.com/amalloy/ordered ?

his implementation is a bit more complex, and involves protocols

I saw that but am trying to avoid extra dependencies...

Since it’s pure clojure you could just paste the sources you need into your project, no extra dependencies that way

Having some real weird problem in a large-ish project: I removed expectations code (everything works) and then I removed the dependency and suddenly my uberjar build fails with: java.lang.ClassNotFoundException: cljs.tagged_literals.JSValue

I removed all transitive dependencies from the expectations dependency via :exclusions — everything works — once I remove expectations itself things break

When I create a diff of the lein deps :tree output before and after removal of expectations it’s a one line difference (i.e. only expectations itself)

here’s the full stacktrace: https://gist.github.com/martinklepsch/a5c28fbfdc5b7ff65f8edd56a8dbe1f8

Seems that if I add a Clojurescript dependency to my regular build (i.e. not just :dev) things work. Just wrecks my brain what expectations has to do with all of that 😄

which is more idiomatic for filtering out nils, (filter identity coll) or (filter (complement nil?) coll)?

I realize the material difference if coll contains booleans

actually, maybe (remove nil? coll) is better

yes, that ^^

This kind of makes me thing I would need to add my src dir manually, but it seems it’s implicit https://github.com/clojure/brew-install/blob/master/docs/guide-clj.adoc#including-your-source-directory-into-the-classpath

I'm almost certain it's not implicit... Are you seeing behavior otherwise?

Hi guys, we just had an interesting discovery when working with clojure: we can call functions like clojure.string/replace throughout our project without explicitly having to require the clojure.string namespace. I assumed the same would hold true for the entire core lib, so I called clojure.set/intersection without requiring clojure.set. This worked in the REPL, but when trying to build an uberjar I get a compilation exception: java.lang.ClassNotFoundException: clojure.set, [...] Exception in thread "main" java.lang.ClassNotFoundException. To get it working I had to require clojure.set at the top of my file. Is there a reason why this behaviour differs between different core libs and between REPL/uberjar?

if you refer to the namespace qualified symbol clojure.string/includes? and the namespace clojure.string has already been loaded (by something else), this is fine.

you should still :require namespaces explicitly, and not assume that something else loaded them

Hey fellas! Does anyone happen to know what serialization format nippy uses? (its the serializer that Carmine uses, which is the library for interacting with redis via clojure)

Aaah, ok. So every ns needs to be required explicitly, even when it's in the core lib? The reason I got so far without requiring clojure.string is probably because it is so common that in most cases one of my dependencies will probably already have required it without me knowing...

That's a good insight. Thanks!

Thank you @ghadi

we've got other services in Nodejs that have to read values in redis which were stored via clojure

so presumably we have to deserialize it into edn somehow, and then convert it to json

it's most common to alias namespaces @vincentdm ... (:require [clojure.string :as string]) then call (string/replace...)

noob question, I have two functions which both return a reify implementing a number of protocols, there is a fair amount of code duplication between the implementations of the two reifys, how do you go about sharing code in this scenario? just move things to functions in the enclosing namespace? I realize this question might be too open, but if I at least understand the options, maybe I can make a better choice

in case anyone was wondering, its a nippy specific format. its not language agnostic. I need to find some way to change the serialization that carmine does.

hi clojure. is there a trick to using gen-class?

Is there a builtin way to go from a java.util.Enumeration to a seq? I have:

(defn enum->seq
  [^java.util.Enumeration enum]
  (lazy-seq
   (when (.hasMoreElements enum) (cons (.nextElement enum) (enum->seq enum)))))

i get ClassNotFoundException whenever i try and use a class i've defined elsewhere 😞

(ns model.document (:gen-class :name model.document :implements java.io.Serializable :state "state" :init "init" :constructors {[String String String] []} :methods [[getContent [] String] [getTitle [] String] [getUrl [] String]])) (defn -init [content title url] [[] (atom {:content content :title title :url url})]) (defn- get-field [this k] (@(.state this) k)) (defn getContent [this] (get-field this :content)) (defn getTitle [this] (get-field this :title)) (defn getUrl [this] (get-field this :url))

(ns classification-server.classifier (:require [model.document :refer :all])) (new model.document "my-content" "my-title" "my-url")

you can't name the class the same thing as the namespace

you also have to aot compile to use gen-class

how do i do that in leinigin?

@ben.mumford you can provide an :aot key in project.clj, see lein help sample for a lot more info

excerpt:

;; These namespaces will be AOT-compiled. Needed for gen-class and
  ;; other Java interop functionality. Put a regex here to compile all
  ;; namespaces whose names match. If you only need AOT for an uberjar
  ;; gen-class, put `:aot :all` in the :uberjar profile and see :target-path for
  ;; how to enable profile-based target isolation.
  :aot [org.example.sample]

thanks for the pointer, i'll give that a try