swimming in the dark here... In a CRUD clojure webapp with a Postgresql db, what is the standard (acceptable) way to access the db from clojurescript? (I have clojurescript serving to one of the handlers, db is accessed via the request map on the rest of the handlers which are strictly clj)

hello guys, I am a Front End guy and I really like Clojure/Clojurescript. Usually, I have been developing apps with Javascript/Typescript and React/VueJS. I am trying to reproduce a similar environment for SPAs in Cljs but I am having a hard time. This is something I am considering: - Shadow-cljs - it would be great to use the NPM ecosystem - Re-frame (or alternatives?) - Re-frame-test for testing - cljss or cljs-css-modules (for css modules) What about linting in Clojurescript? Any suggestion for boilerplates/technologies for SPAs (real-world scenarios)? I hope somebody could help or point me in the right direction, cheers 🙂

In an old reagent app, I'm having unreasonable difficulty invoking a macro:

I get "can't call setState on unmounted components" error

Is the error in my cljs macro code (I've never written a macro in cljs before)?

there's nothing that would be changing state in that macro body so my guess is it's an issue somewhere else in your code

Looking via the repl, I see that no matter what I put into body, it seems to be received as nil

Clearly there's something I don't understand here...

@worlds-endless macros are a bit trickier in CLJS and can't be written like that in the REPL

Written in my files, too, my & body never seems to receive anything

macros need to be written in CLJ

Seriously? In 2019?

yep. not going to change.

Why?

https://clojurescript.org/about/differences#_macros

Thanks... that's the most disappointed in Clojure I've ever been

(which says somethign about how blissful my time in Clojure has been)

I don't know how it can go otherwise - they run at compile time on the host machine.

They can be written in self-hosted ClojureScript

Its logical if you think about it. When do macro run? They run at compile time. What compiles ClojureScript? Clojure does. Macros must thus be evaluated by the compiler. In this case, that's Clojure, and thus the macros have to be written in Clojure.

But, self-hosted ClojureScript is a ClojureScript compiler for ClojureScript code. Thus, if using that, you can write macros in ClojureScript.

@didibus Yeah; makes sense. Just seems like the ugly stepchild I never knew about...

Ya, it does make CLJS a bit more complicated tooling wise. Because it has a dependency on Clojure and JVM as well as the JS runtime you target and ClojureScript

Now, I think it would be possible to build tooling that can be connected to both a Clojure repl and the ClojureScript repl within it. And would be smart enough to eval the macro into the Clojure repl, and somehow reify its evaluation into the ClojureScript repl.

Not sure

But anyways, don't think that exists right now.

@worlds-endless I see no one has mentioned that how macros work in ClojureScript is necessary

the number of people using it would be miniscule today if it wasn't for that early decision Rich made

self-hosted ClojureScript is 2-3mb before gzipping

basically 10X larger

@dnolen You mean bundling a compiler into the artifact adds a lot of size to it, which would be detrimental for browser based js targets ? And that was a reason to move the compiler out into Clojure?

Ye

er yep

Ya, makes sense. I guess though, the compiler could be in a separate Jar. Only used during development for repls

Erm, I guess not Jar, but some JS bundle 😋

that doesn't help macros

Has anyone used d3 with clojurescript? I’m pretty sure I’m supposed to be getting a map back from this function, but I can’t figure out why it crashes. (I mean I can tell it’s calling length on something undefined, but.. l don’t know what I’m missing..)

@hobosarefriends you still have the issue where you are double-wrapping things in parens

cljs.user> ((-> "foo" (str "bar")))
TypeError: ...

same thing with your anonymous functions

cljs.user> (def foo #((get-in {:a {:b {:c 1}}} [:a :b :c])))
#'cljs.user/foo
cljs.user> (foo)
TypeError: ...

In general, you almost never see stacked left parents in regular Clojure code

(there are some cases with higher order functions that make fns)

@lilactown Oh good you’re still around 😅, woops older example sry I thought i fixed that.

your error is from the double parens around ->

well im supposed to call the outcome of that one

ah

right?

have you inspected what is returned by just

(-> (d3/stratify)
               (.id #(get-in (js->clj %1) [:child :uuid])) 
               (.parentId #(get-in (js->clj %1) [:parent :uuid]))

#object[stratify]

try js/console.log

I did, it returns a function

if it’s a function, it should be printed like a function

hm

` stratify(data){var i,n=data.length,nodes=Array(n),nodeId,nodeByKey={};for(i=0;i<n;++i){var d= data[i];var node$jscomp$0=nodes[i]=new Node(d);null!=(nodeId=id(d,i,data))&&(nodeId+=“”)&&(d=“$”+(node$js…`

and TypeError: Cannot read property 'length' of undefined at stratify ( is still the error?