(type 'h1) => cljs.core/Symbol (type (first '('h1))) => cljs.core/List Do you guys know why the second example doesn't return Symbol?

probably because the quoted list isn’t evaluated

Ah yes or that.. What Nate said.

Yeah but what about this? (some #(= 'a %) '(3 'a 4)) => nil

It works if the coll is a vector (some #(= 'a %) [3 'a 4]) => true

Not sure whether it might be a bug

Use list rather than quote and try not quoting the a if you are quoting the list

Remember what ‘a expands to and what quoting a form does (when you’re quoting a s expression and one of its members is itself a quoted form

’(3 ‘a 4) will be (3 (quote a) 4)

and a is not equal to (quote a)

When working with promises at the REPL, am I correct in thinking that there’s no way to get the REPL to wait for the promise to be resolved and then return that value as the result of the evaluation?

@cfleming correct. can't block.

the load example is, how can i translate it into cljs?

i just write this, (.load storage #js {:key :username})

but the output is #object[Promise [object Promise]]

hi, what is the fastest way to start with clojure script to have a react app with reframe

are there some boilerplates for newcomers

I, like many others, started with https://github.com/plexus/chestnut

thank you

Is it possible to have - a foo.cljs file + - a foo.cljc file that defines a CLJS function bar and to call the bar function in foo.cljs? or this this foo.cljs + foo.cljc construction only used for referring macros?

no, not possible. foo.cljc will only be used for CLJ side of things (ie. macros)

good. can you explain a bit?

a .cljs file should always be loaded in preference to .cljc

There is spec/alpha.cljs and spec/alpha.cljc.

CLJS will load .cljs and the :require-macros in that will load the spec/alpha.cljc as a MACRO ns

And the defmacros from spec/alpha.cljc can be used from spec/alpha.cljs in self-hosted mode

self-hosted works the same way in that sense. spec/alpha.cljc will be loaded as spec.alpha$macros ns, so it is a separate ns from spec.alpha

ok so this only works when requiring macros, that’s good to know

without the :require-macros CLJS won't touch the .cljc file (if a matching .cljs file exists)

thanks!

Clojure is the same way - .clj is loaded in preference to .cljc file

in other words, platform-specific overrides common

Summarized: when you have a foo.clj(s) + foo.cljc, in Clojure, the foo.cljc will be ignored and in ClojureScript only macros will be read from .cljc

as Alex said: if the platform specific file exists it will be loaded

:require-macros will therefore load a .clj file over a .cljc file as well

so this .cljs+`.cljc` pattern is really only for self-hosted stuff

otherwise .cljs+`.clj` is much simpler to work with

foo.clj + foo.cljc Clojure: foo.clj is loaded, foo.cljc is ignored. ClojureScript: foo.clj is loaded when requiring macros, foo.cljc is ignored. --- foo.cljs + foo.clj Clojure: only foo.clj is loaded when required ClojureScript: foo.cljs is loaded when required, only macros are read from foo.clj --- foo.cljs + foo.cljc Clojure: only foo.cljc is loaded when required ClojureScript: foo.cljs is loaded when required, only macros are read from foo.cljc --- foo.cljs + foo.clj + foo.cljc Clojure: only foo.clj will ever be loaded, foo.cljc is ignored ClojureScript: foo.cljs is loaded when required, only macros are read from foo.clj, foo.cljc is ignored ---

why make it so complex?

loading CLJS code .cljs over .cljc. loading CLJ code (directly or via :require-macros) .clj over .cljc

yes

first case was also incorrect. foo.clj + foo.cljc -> CLJS loads .cljc and :require-macros loads the .clj. .cljc is not ignored for CLJS

darn

you’re right. the .cljc file is still used for normal CLJS functions

but what if you have also macros in there?

will be used as self-host macros

at least I think it will? I'm actually not sure ... self host hurts my head

it loads .cljc files in :cljs mode so it should in theory pick .cljc over .clj in that case

so I guess cljs.spec.alpha.cljc is not a .clj file, only because of self-host?

probably yeah

why does the second thing cause this? Stack trace of root exception is empty; this is likely due to a JVM optimization that can be disabled with -XX:-OmitStackTraceInFastThrow. ---- Exception ---- ---- Exception Stack Trace ---- java.lang.NullPointerException: nil

If I want to use an external react widget library, do I need to write it a deps.edn so that it will be loaded after the React provided by Reagent?

no

Hmm... then I must be something else wrong. Does that ring any bell? Uncaught TypeError: Cannot read property 'PureComponent' of undefined

how are you including the external library in your project?

First I tried loading it directly via the HTML. When I got the error I thought it was because it was loaded before React, so I added the foreign-libs bit and removed it from the HTML, but still get the same error.

The error comes from the lib js itself when loading it.

honestly I'm not sure, I haven't used the raw CLJS compiler in awhile

I am not sure how the foreign-libs stuff works. my guess is you'll also need to provide React using the foreign-libs interface as well

I use shadow-cljs for everything 🙂

I'm in a similar position; I always use cljsjs or make my own wrapper. For some particular reasons in this project I need to load everything differently and it's throwing me off.

Could it be a JS compilation issue? (I vaguely remember encountering some JS once that needed to be compiled for the browser.)

my best guess is that highcharts-react is trying to access React.PureComponent and it's not there

Well yeah, this part I got 😛 That's the how/why I'm trying to figure out.

is React even on the window?

Yes, the whole app is running fine. It's just this library that won't load.

sry, I forget even how cljsjs works. in shadow-cljs, libs are not exposed on window

I'll let someone else weigh in who might know more about foreign-libs

Alright. Thanks for your input, I appreciate it!

I'm leaning more and more with the JS not being compatible with cljs (webpackUniversalModuleDefinition), but I don't know enough about the subject 😕

I am using Om and I have om/IShouldUpdate defined within my component but for some reason it is not being called. I dont see my println... I am updating the state with om/update-state!