Generics Type Variance Explained: covariance, contravariance and invariance 

We look into generic type variance (covariance, contravariance and invariance) in C# and Dart languages.
0:00 Introduction
1:06 Data model
2:44 Covariance
9:36 Contravariance
13:27 Invariance
17:32 Breaking invariance
20:04 Problems with variance in Dart language
25:43 Questions and Answers
Code: github.com/arturaz/CodeLaunch...
Join the Discord channel: / discord