Swift to JavaScript

Yes. In that case you’d have to learn Java . But you could also try to use a language which supports Android and iOS.31 Oca 2015

After mastering the language fundamentals, code can easily be translated from Swift to Kotlin . … First, using Xcode, you will explore an iOS app written in Swift, then you will re-write the same app in Kotlin using Android Studio.

No, you can’t . The similar names are unfortunate but JavaScript and Java are totally different languages.