How can I make the / in (clojure.string.replace s #"(.+?)(\/+)$" "$1")) taken from a variable?

Where can I find the list of type hints which can be used in a .cljc file?

i cant figure out why this doesn't work, x is a collection of numbers and i'm trying to return all of the odd numbers

i assume i'm misunderstanding something about how reduce works

why not use filter?

(filter odd? x)

you build things up in a but if b is not odd you throw it away since when returns nil if the condition is not met

didn't know about filter, i'm doing clojurecademy and it hasn't covered that yet so i'm assuming it kinda meant for me to use reduce like the previous problem

(reduce  (fn [acc x]
             (when (odd? x)
               (conj acc x)))
           #{}
           coll)

a b better be named acc v or x right

if odd? conj acc x else acc

reduce expects the reduction function to return the "accumulation" value each time. so you need to return acc or (conj acc x). if you return nil you are wiping out your previous results

ahh i see now

derp, thank you

👍

how do you deal with multiple versions of jvm's

@sotrhraven

:java-cmd "path/to/java"

its also possible to create multiple profiles and setup different versions of dependencies

cool thanks, Is there a page on profiles. also the :java-cmd should help

https://github.com/technomancy/leiningen/blob/master/doc/PROFILES.md

i think there is also LEIN_JAVA_CMD envar

Thanks

@sotrhraven also this https://github.com/technomancy/leiningen/blob/master/sample.project.clj

search for :java-cmd

@nxtk that worked, thanks 😊

Hello everybody.

I’m working through Ch7 of living clojure and I think I’m getting tangled up in version dependencies

The book is written circa 2015

pardon the length of this output

my cheshire-cat.core file

core.cljs

(ns cheshire-cat.core
  (:require-macros [cljs.core.async.macros :refer [go]])
  (:require [clojure.browser.repl :as repl]
            [cljs-http.client :as http]
            [cljs.core.async :refer [<!]]
            [enfocus.core :as ef]))

(defn ^:export init []
  (repl/connect "")
  (go (let [response (<! (http/get "/cheshire-cat"))
            body (:body response)]
        (ef/at "#cat-name" (ef/content (:name body)))
        (ef/at "#status" (ef/content (:status body))))))

my project version dance

(defproject cheshire-cat "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url ""
  :min-lein-version "2.0.0"
  :dependencies [[org.clojure/clojure "1.10.0"]
                 [compojure "1.6.1"]
                 [ring/ring-defaults "0.3.2"]
                 [ring/ring-json "0.5.0-beta1"]
                 [org.clojure/clojurescript "1.10.520"]
                 [cljs-http "0.1.46"]
                 [org.clojure/core.async "0.4.490"]
                 [enfocus "2.1.1"]]
  :plugins [[lein-ring "0.12.5"]
            [lein-cljsbuild "1.1.7"]]
  :ring {:handler cheshire-cat.handler/app}
  :profiles
  {:dev {:dependencies [[javax.servlet/servlet-api "2.5"]
                        [ring/ring-mock "0.3.2"]]}}
  :cljsbuild {
      :builds [{
          :source-paths ["src-cljs"]
          :compiler {
            :output-to "resources/public/main.js"
            :optimizations :whitespace
            :pretty-print true}}]})

Does anyone know if namespace https://clojuredocs.org/clojure.core/ns have changed over the past several Clojure versions? In how they are setup at the top of your code. I didn’t start out on earlier Clojure versions so I don’t know.

hmm more cattle then hat

So I’m trying to import JavaFX stuff to do interop, but for some reason I’m getting a ClassNotFoundException on javafx.scene.Scene and I’m not sure why. I’m running OpenJDK 11.0.2 and Clojure 1.10.0 if that matters.

So I’m testing out java interop through JavaFX and I’m trying to draw a basic circle, but for some reason it can’t find the class collijion.core when I run the launch method. I’ve tried setting :name in gen-class, but that didn’t work either

@nicholas.jaunsen Gen-classes need to be AOT compiled

See: https://stackoverflow.com/questions/42617678/gen-class-in-clojure-and-use-it-immediately

Basically, see if you can use proxy or reify instead in your case.

And if you can't. You will need to compile your code with AOT turned on. And then it will work. But in the REPL, it won't be available, unless you run compile and then make sure your compile path is in the path for your REPL, and you start the REPL after compilation.

has anyone had to downgrade or upgrade readline on osx for clojure to work?