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

Becoming popular in the early 1990s and the norm today, object-oriented programming (OOP) languages, such as C++ and Java, provide a formal set of rules for creating and managing objects.

Object-oriented programming gives us modifiers, which control the visibility of members and methods. In some languages, like Java, we have modifiers such as private and public.

C#: Used in app, game, and web development, C# is an object- and component-oriented programming language similar to the C and Java language families.