@venantius: i think you can specify :es6 as an option for :module-type for a foreign-lib. I haven’t personally used it. So can’t vouch for it. https://github.com/clojure/clojurescript/wiki/Compiler-Options#foreign-libs

Anyone aware of a library that let's you describe a set of derived atoms based on one atom (ideally allowing dependencies between the derived atoms)?

@martinklepsch: something like rum's derived-atom (https://github.com/tonsky/rum#091)?

the similar stuff off the top of my head: Javelin, freactive.core, reagent (reactions/ratoms) and maybe frozenlock/entanglement

and also funcool/lentes

@metametadata: these are all fine to get a new atom based on one or more other atoms but I want to construct many of these derived atoms based on some description. Maybe combining derived-atom + component will allow me to achieve that

Hi, whats the best way to go from a JSON object to a native Clojurescript Hashmap?

@crankyadmin: There's js->clj.

(GET "/accounts/user-stats"
     {:handler #(do (println "results: " (js->clj  % :keywordize-keys true) )
                    (reset! user-stats (js->clj % true)))
      :format :json
      :response-format :json})

{"username":"crankyadmin"} <--- that the server returns.

js->clj appears to returning a vector.

I'd really like it to look like {:username "crankyadmin"}

If a reference to an atom is "lost" i.e. it can be GC'ed does this also remove watches?

any recommendation for a game engine for game like mario in clojurescript? So far I found https://github.com/alexkehayias/chocolatier which looks promising

I equally don't understand why its trying to turn {"username":"crankyadmin"} into a array...

@martinklepsch yeah, atom should be gc'ed with all its fields. I guess I even tested it some time ago with devtools in browser 🙂

@metametadata: thanks!

In CLJS apps we often have derived atoms/reactions/`track` etc. Most of the times we just def. these things but I thought maybe it's nice to represent this as a dependency graph which allows construction of these interrelated references without globals, came up with this: https://gist.github.com/martinklepsch/c5a2feacc63ce08565fcffe37951ab64 — any feedback/thoughts welcome! /cc @metametadata

Hi! Has anyone ever encountered this error:

user-error: `cider-load-buffer' needs a ClojureScript REPL.
If you don't know what that means, you probably need to jack-in (`C-c M-J').

@martinklepsch: looks neat! do you plan using this in Reagent apps somehow?

Also, every clojurescript file ever starts in clojure major mode, instead of the clojurescript one. Do somebody know why?

@metametadata: Considering it for a Rum app for now but could be used in Reagent as well. Drawback to something like re-frame's subscribe is that the deriving is always done no matter if a component actually uses the derived data

Yeah, good point. I also think reagent component won't be able subscribe to a plain atom, it needs ratoms/reactions.

@metametadata: right but that's a matter of swapping rum/derived-atom with reaction or track

@martinklepsch: yep

https://clojurians.slack.com/archives/boot/p1467262254001972

https://clojurians.slack.com/archives/boot/p1467263022001975

Hi, I could not find explanation in clojurescript wiki for above, so was wondering if somebody from this # could help me.

for Google Closure libraries does :import only work for things that have been provide()-ed?

i’m working with goog.ui.KeyboardShortcutHandler, it provides goog.ui.KeyboardShortcutHandler.EventType enum & I can :import that, but it also has goog.ui.KeyboardShortcutHandler.Modifiers that it doesn’t provide (but example JS code clearly accesses)

attempting to :import goog.ui.KeyboardShortcutHandler.Modifiers results in an error

@rorydouglas:

I am able to do:

(ns example.core
  (:import [goog.ui KeyboardShortcutHandler]))

(println KeyboardShortcutHandler.Modifiers)

@rorydouglas: what you say does seem true though.

thanks @rohit

yeah it seems i can access them, just can’t access them the same way i do from imported Enums (e.g.. can’t do Modifiers.CTRL)

@rorydouglas: seems that way. you could raise an issue with closure-library. imho, it should have been provided here as you observed: https://github.com/google/closure-library/blob/master/closure/goog/ui/keyboardshortcuthandler.js#L22

will do - thanks!

https://github.com/google/closure-library/issues/726

neat. 👍:skin-tone-3:

Hello All 🙂 Would someone be able to help guide me through the following function? I've been using ClojureScript for a few days now, but can't seem to get my head around the bit-or method being used?

(defn get-uuid []
  (apply
   str
   (map
    (fn [x]
      (if (= x \0)
        (.toString (bit-or (* 2 (.random js/Math)) 2))
        x))
    "00000000-0000-4000-0000-000000000000")))

@kino https://github.com/clojure/clojurescript/blob/a5cb207d30c9343a850d6364df674b838fb9c9ba/src/main/cljs/cljs/core.cljs#L10231

It is unclear what you are asking..how the code works or how to get a uuid? You are mapping the inner fn over the "0000..." and swapping out the zero characters with your bit-or result.

Your x arg is only used as a character check, is not involved in random int generation

@ojd look up bitwise-or somewhere, hints you have an random number and you are trying to pull a hexadecimal value (0-F) out of that random number

@kino: so (rand-nth ["0" ... "f"]) would work

you would need to fill in the dots

Yeah, not sure what’s going on with that code, the (.toString (bit-or (* 2 (.random js/Math)) 2)) seems to be generating random 2’s and 3’s only.

oh shoot I didn't even look at it 😞

Can goog-define be used with advanced compilation? Docs say not so with whitespace, but don’t mention advanced

@manutter51: Most likely, JS bit-wise or operator is coercing the arguments to unsigned integers, basically looking like:

(2 * Math.random()) >>> 0

Or at least, it's converting it to a signed int: see here: http://www.ecma-international.org/ecma-262/5.1/#sec-11.10

Or: http://www.ecma-international.org/ecma-262/6.0/#sec-binary-bitwise-operators-runtime-semantics-evaluation

yeah it seems like the code isn't working as intended at all

http://stackoverflow.com/questions/105034/create-guid-uuid-in-javascript

@bhauman @manutter51 @wildermuthn thanks guys. I was unsure when I saw it as well. Will try researching @peterschwarz alternative as well.

this seems to work (Math.floor(Math.random() * 16) | 0x1).toString(16)

@pat thank you Pat. Yes, I was just trying to figure what the code was trying to do and any alternatives that make sense.

@bhauman: awesome. Will give this a go. 😊👌

or Math.floor(Math.random() * 16).toString(16)

but I would check the distribution

@kino: you should of course use the one in cljs.core https://github.com/clojure/clojurescript/blob/master/src/main/cljs/cljs/core.cljs#L10231

I just got caught up in the implementaion and forgot to mention that

there are no lint for clojurescript?

Anyone have an example repo where you use your custom javascript in your cljs app? Like.. https://github.com/clojure/clojurescript/wiki/Dependencies#user-content-google-closure-compiler-compatible-code I’m using reagent / figwheel and following those directions. Created a build.clj as suggested, compiled my app, but nothing happens, output isn’t generated.

@henry is your build configured to load the js? Either :libs or :foreign-libs

Yeah I tried both build.clj and project.clj, Do you know which one it should be?

You can get your build config to the compiler both ways. A build script is more manual

Try a '$lein new figwheel yourapp'

Configure your javascript. If it works, you know its a problem in your build script

The app works, but once I add this into my project.clj, it doesn’t

:compiler     {:main                 reagent-closure-compatible-js.core
                    :libs [{:file "yayquery.js" :provides ["yq"]}]}
                    :output-to            "resources/public/js/compiled/app.js"
                    :output-dir           "resources/public/js/compiled/out"
                    :asset-path           "js/compiled/out"
                    :source-map-timestamp true}}

here’s the repo btw https://github.com/hzhu/reagent-closure-compatible-js

I’m just trying to replicate the clojurescript wiki with yayquery

Yeah you gotta have your external js keyed into your build configs

:libs if closure compatible

in the project.clj? under :compiler?

Yep

Hmm now it throws an exception when I run lein figwheel dev. I added this to project.clj https://github.com/hzhu/reagent-closure-compatible-js/blob/master/project.clj#L29

Exception is pretty unintelligible

clojure.lang.ExceptionInfo: Error in component :figwheel-system in system com.stuartsierra.component.SystemMap calling #'com.stuartsierra.component/start {:reason :com.stuartsierra.component/component-function-threw-exception, :function #'com.stuartsierra.component/start, :system-key :figwheel-system, :component #figwheel_sidecar.system.FigwheelSystem{:system #object[clojure.lang.Atom 0x2835de0c {:status :ready, :val #<SystemMap>}]}, :system #<SystemMap>}

I am afk atm but try given the full path in your :libs, add :verbose true & build without fw, see what happe s

$lein cljsbuild once dev

:thumbsup: thanks I’ll give that a shot