2025-02-24 clojurescript | Clojure Slack Archive

clojurescript 2025-02-24

Jan Šuráň 2025-02-24T20:08:36.280499Z

Interesting. identical? works fine, but = fails 😄

(->> (js/document.getElementsByTagName "iframe")
     (some (fn [iframe]
             (when (= (.-contentWindow iframe)
                      (.-source js-event))
               iframe))))

I asssume that this breaks some things?

(core/defmacro coercive-= [x y]
  (bool-expr (core/list 'js* "(~{} == ~{})" x y)))

p-himik 2025-02-24T20:15:26.642699Z

No, it's because = tries to call the -equiv function defined on the IEquiv protocol.

thheller 2025-02-24T20:23:01.840509Z

note that you can't just directly transfer objects between context, e.g. iframe and main document. this will never work for CLJS datastructures and they need to be serialized back and forth

Jan Šuráň 2025-02-24T20:32:27.084969Z

Interesting. But the === operator works.

Jan Šuráň 2025-02-24T20:33:10.755859Z

But it makes sense that it works this way.

thheller 2025-02-24T20:33:42.827129Z

JS uses a very weird sharing scheme that gives you basically a proxy to the original object which is meant for JSON like data and limited to it

Jan Šuráň 2025-02-24T20:35:04.909699Z

What do you mean by it being meant for JSON?

thheller 2025-02-24T20:36:14.169579Z

not JSON. JSON like data. objects, numbers, strings, etc. not class instances

thheller 2025-02-24T20:36:38.854119Z

it can do a bit more, but it can't be extended