Google today announced that the Kotlin programming language is now its preferred language for Android app developers. "Android development will become ...

Kotlin offers big advantages over Java for JVM and Android development, and plays nicely with Java in the same projects.

It’s no surprise that Google’s hope is that over time, all Android developers will switch over to Kotlin. “There is still quite a bit of Java still happening on Android,” Ward said.

Here's what Meta's developers have learned from moving their code base from the Java programming language over to Kotlin.