Interactive Study Module

Generics, Invariance, Covariance (out) & Contravariance (in)

By Bravion EDU KOTLIN Team

11 min read

Lesson Overview: Generics, Invariance, Covariance (out) & Contravariance (in)

KOTLIN • Level 3: Advanced Concepts & Deep Dives

This is lesson 16 of 19 in the KOTLIN track (Level 3: Advanced). Modern, concise, null-safe language for the JVM and Android; Google’s preferred language for Android development.

Lesson write-up in progress

The full written walkthrough for "Generics, Invariance, Covariance (out) & Contravariance (in)" has not been published yet. Use the sandbox below to experiment, and use the module outline to move to neighbouring lessons.

Try It Yourself Sandbox

Edit code & run live

Centralized Compiler Sandbox

5 / 500 lines

Running Kotlin (view only) code isn't supported in this sandbox yet. You can read, edit and copy this example. Languages you can run here: JavaScript, TypeScript, Python, C, C++, Java, PHP, Go, Bash, SQL, HTML and CSS.

Step 5: Remember This! (Memory Anchors)

Where This Lesson Fits

Module: Level 3: Advanced Concepts & Deep Dives (5 lessons)
Previous lesson: Kotlin StateFlow & SharedFlow Reactive Streams
Next lesson: Jetpack Compose Declarative UI for Android

Module Progress Checkpoint

Ready to verify your understanding?

Click below to mark this study unit completed and claim your +50 XP reward.