Marcin Moskała

Android developer and Kotlin trainer certified by JetBrains; Author of the books;

Talk Title

Kotlin variance modifiers and Covariant Object Nothing pattern.






13:50 > 40 min


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Variance modifiers are a powerful feature, helping us in everyday programming, yet it is not understood by most developers. In this presentation, you will learn how it works, what are its limitations, and how it allows powerful programming patterns like Covariant Object Nothing.

Speaker Bio

Marcin Moskala is an experienced Android developer, teacher, and an official Jetbrains’ Kotlin training partner. He is the founder of Kt. Academy, author of the books “Android Development with Kotlin”, “Effective Kotlin” and “Kotlin Coroutines. Deep dive”. He is also an active programming community member, the main author of the biggest medium publication about Kotlin, and a speaker invited to many programming conferences.