Reported to CLJS-2397

Hey guys, 4Clojure problems updated on Clojurecademy - https://clojurecademy.com/courses/17592186045426/learn/syllabus

@jeaye The issue you reported with instrument and :advanced is actually instead due to :static-fns. See https://dev.clojure.org/jira/browse/CLJS-2397 for more details.

Hi, I'm using a javascript dependency that is packaged with cljsjs. I can't find any documentation for the translation between the JS object methods and cljs. Is there a primer someone can point me to?

@ertucetin Ertuğrul hi, is your project open-source ?

@scknkkrer https://github.com/clojurecademy/clojurecademy

not Ertugrul but I like the project

Yes it is

@sirwobin The https://clojurescript.org site doesn't yet have an official interop guide, but there is a draft one that covers this https://github.com/mobileink/clojurescript-site/blob/88805681e76a86dcab068ec8b574ed733ebd5f8c/content/reference/javascript-interop-ref.adoc#js-object-property-access A popular non-official guide is at http://www.spacjer.com/blog/2014/09/12/clojurescript-javascript-interop/

Just be aware that it incorrectly recommends aget on objects in places.

Also—in printed form—ClojureScript: Up and Running covers this. (An updated edition of that book is in the works as well.)

hello friends, I am trying to use Cursive and Lumo together by using Tubular socket REPL client. It is working but I have to type my code in a new small prompt with the “Enter string for standard input” and it’s not manageable. Someone know what’s happening ? Thanks a lot

@baptiste-from-paris Did you choose “Use clojure.main in normal JVM process”? (See the note in the Tubular README.md)

yes offcourse

I read all the README.md

Cool. Usually the little dialog pops up owing to I/O handling and using a “plain” REPL avoids that aspect. Hrm.

do you have to specify some parameters (JVM args, env...)

?

ok, restarded IDE and it’s working...

Let me check with the latest Cursive… perhaps something broke. You shouldn’t have to supply any extra params.

Ahh. Cool! 🙂

sorry for that

thanks a lot 🙂

🦆

🙂

This makes me wonder if there is now an extra step where you need to restart the entire IntelliJ IDE. Hmm.

@mfikes by the way, are you able to send a form to the REPL (in the Tubular context) ? I have the “Cannot load Clojurescript form into Clojure REPL” error

@baptiste-from-paris Yes, in Cursive, ensure that the little language pulldown in the REPL UI indicates “cljs” instead of “clj”.

Perfecto !!!

forgot this one ...

(Cursive will automatically switch language if it sees To quit, type: :cljs/quit, but Lumo / Planck don’t print that out.)

Ok

@mfikes do you have symbol resolution in cursive for free without conf (no the repl but files) ?

@baptiste-from-paris IIRC, yes. If you have a project.clj file set up then Cursive will index your source files.

😞 js/require and such js fn’s are not recognized

Oh, well, Cursive has no source to index to find something like that perhaps.

Cursive can index JavaScript, but those are special fns in Node, I guess.

ok ok, it’s still a great UX

Can anyone recommend a more readable alternative for string interpolation in ClojureScript that is similar to "This is a #{value}."? I saw strint in core.incubator. I don’t expect to be able to use that in CLJS though — unless I’m mistaken

Is it idiomatic to use goog.string.format?

yes, but goog.string.format is discouraged by Closure Library maintainers themselves - limited functionality and DCE unfriendly

which is why we don’t provide format out of the box anymore

Yea I read the deprecation notice. Is it common in CLJS to use macros like the strint macro defined in core.incubator? Seems to have a nice API

I worry that it may only expand into Clojure friendly-code though

although after reading the source it seems like it’s relying on str, which seems promising

For anyone future readers, it does work, and its syntax is fantastic: (<< "My name is: ~{name}.") desugars into (str "My name is: " name)

why not write (str "My name is: " name) directly?

@thheller it is not as readable as the alternative syntax. esp. when the string interpolation has nested quotation marks etc. I’m using string-interpolation for composing queries

@mfikes Just read your advice. Will take a look tomorrow. Thank you!

languages like Ruby, Elixir, JS support both string concatenation and string interpolation for these reasons

nice to see that Clojure has it slated in the incubator

I'm importing a react component (using :npm-deps feature) and wrapping it with the adapt-react-class adapter, this fails with Uncaught TypeError: Cannot call a class as a function, but only when :optimizations :advanced. I reproduced behaviour in a minimal repo: https://github.com/fbielejec/npm-deps-demo

Just checking, but are (set! (.-y item) 10) kind of expressions also vulnerable to DCE?

The name of y I mean

hi, ho someone know how in hiccup set text input to max 4 lines height but default to one. (the overflowing top line should just hide)

Streamy HTTP library for cljs (or js) - anyone know a good one?

Apparently this is a very rare need

@borkdude Are you worried about renaming? (As opposed to DCE.)

@borkdude Your set! example will compile to JavaScript that looks like item.y = 10. In other words it is not really different than (.-y item) by itself, which is subject to renaming under :advanced.

yes, I noticed.. thanks 🙂

Is there an obvious, likely, cause for when the ClojureScript compiler says "No such namespace x.y.z, could not locate x/y/z.cljs ..." when z.cljs is right there next to other namespaces under x.y that it is finding?

the location of namespaces must match the classpath

@dnolen i can parse that sentence but not interpret it

darnit, letter blindness... i should have tried copying the path from the error... two characters transposed

problem was in the :require not the file, sorry for the noise

ah k

I am running a CLJS project and things were working well and than CLJS stopped tracking the web socket connection correctly. I am getting this error: WebSocket connection to '' failed: Error in connection establishment: The app compiles correctly. Any pointers on how to debug this issue? I have tried stopping and restarting the app. You can see the app itself here: https://github.com/tkjone/clojurescript-30/tree/master/34-calendar-fun

Its odd because that is not the connection that the socket is listening on...its like its caching an old socket address

And the answer: clear your cache