What are the universal programming languages ​​for Android and iOS?

Question

Java

Hello, recently I saw an article somewhere about a new language, more universal in which you can write both under iOS and under Android. Tell me what are the programming languages ​​of this type for these wasps?

Answer 1

Native:
Kotlin (planned for iOS), Swift (possibly coming to Android) Cross-
platform:
Dart, JS (Ionic, React Native,... ), C# (Xamarin, Unity3D)

Answer 2

Dart, c#, javascript