What is the best way to convert the javascript code into clojurescript?

Looking to utilize capacitor/app in order to determine the state (background or active) of my iOS app. My project is built on Clojurescript, so I need to convert the following javascript code into a clojurescript equivalent.

  • Javascript
import { App } from '@capacitor/app';

App.addListener('appStateChange', ({ isActive }) => {
  console.log('App state changed. Is active?', isActive);
});
  • Clojurescript translation
(ns js.sample
  (:require ["@capacitor/app" :refer [App]]))

(.addListener App "appStateChange"
                  #((fn [isActive]
                      (js/console.log isActive))))

Expecting to receive isActive as either true or false, but consistently getting an output of undefined. What could be causing this issue with my code? Thank you for any assistance.

Answer №1

(.addListener App "appStateChange"
                  (fn [^js event]
                    (js/console.log (.-isActive event))))

It has been pointed out in cfrick's comment that the use of #(...) is unnecessary in this context. This shorthand notation for functions, #(...), is already being utilized as a function in the code.

In JavaScript, when you see {isActive} within a function's signature, it signifies that the value of the isActive field from the object passed to the function will be assigned to isActive.

The use of ^js in CLJS indicates that the following name contains a JS object. This is important to prevent names like isActive from being changed by the compiler during production build optimizations. While not entirely necessary in this case due to the origin of the name isActive from a JS API, it is still considered good practice for clarity purposes. However, note that ^js should not be used with goog imports.

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