Is there a way to invoke a constructor in CLJS with an array instead of specifying the args separately? e.g.

(new* js/Error ["hello"])

without macros

apply seems to work, but not sure if I should be doing that

apply works because Error can be called as a function and still behave as a constructor. this is true of many constructors in JavaScript, but not everyone

@christian767 can you give an example when this would not work? and what would be the proper solution in general?

function Constructor(a, b, c) {
  if (!(this instanceof Constructor)) {
    return new Constructor(a, b, c);
  }

  // ...
}

but not all of them do. for instance String(...) behaves differently from new String(...). With user provided constructors there's no way to tell other than checking the source.

oh ok, but is there is a way to invoke new from cljs with an array of args instead of single ones?

Hi, I am getting something very strange and wonder whether someone can hint to what is going on. The context is a fulcro app in the browser so it could be related to react or something. Here I map over notes, which works:

(dom/div (map ui-note (sort :note/id notes)))

(dom/div (map ui-note (sort #(> (:note/id %1) (:note/id %2)) notes)))

(dom/div (map ui-note (sort #(> (:note/id %1) (:note/id %2)) notes)))

Can you remove the dom related stuff and reproduce the bad sort in the repl with just data?

Good idea. I only use chrome for development. I will do that.

Its not the repl, but I changed it to (str (sort :note/id notes)) and they sort differently.

I will minimise to get a minimal reproducible case.

Ok. I have a webpage that renders

(str (sort :note/id '({:note/id 1} {:note/id 2}))).

({:note/id 1} {:note/id 2})

({:note/id 2} {:note/id 1})

I can repro this as well

@magra you are using it wrong, sort takes comparator fn which takes two args

(str (sort #(compare (:note/id %1) (:note/id %2)) '({:note/id 1} {:note/id 2})))

I think in your case it’s undefined behavior

you want to use sort-by not sort

ah!! that makes sense!! thank you! That explains why it works when I supply it 😉

And thank you Thomas Heller, that is why I remembered it working.

can someone clarify the difference between seq and seqable ?

seq is a seq, seqable means it can be coerced into a seq

To clarify, the above are really about seq? and seqable?

Make sure we are thoroughly represented here, people: https://survey.stateofjs.com/ 🙂

Why CLJS calculates wrong?

I am trying to calculate VAT for users but CLJS makes up the answer

https://stackoverflow.com/questions/11695618/dealing-with-float-precision-in-javascript

thank you

Hey there, I was trying to use cemerick's fork of valip in a project, but when I try to start the server it throws Syntax error (IllegalAccessError) compiling at (valip/predicates.clj:1:1).read-string does not exist

Do I have to include cljs on the server side somehow?

Nevermind, figured out how .cljc works

Hey guys, trying shadow for the first time (figwheel-main was my go to so far) .. starting up via cider M-x cider-jack-in-cljs gives me a clojure.lang.ExceptionInfo : missing instance { } error ... any clue what this is about?

I'm guessing its looking for a shadow server. And lein should have started it but hasn't managed to?

Has anyone worked with Google Maps Javascript API (on client side) with shadow cljs? Assuming I load the library with my API key through the html page, how do I then create a Map object to configure it?

solved: Run via shadow-cljs not lein in the cider popup. guessing it was a no-go on the build triggering server/start!. Suggest adding this to the user manual at https://shadow-cljs.github.io/docs/UsersGuide.html#cider