← Android App Development (Kotlin) learning pathAndroid App Development (Kotlin) · Module 2 of 10
Kotlin for Android
Learn the Kotlin features used every day in Android.
📖 Key ideas
- val is read-only; var is mutable.
- Null safety: String? and safe call ?.
- Data classes hold data: data class User(val name: String).
- Lambdas and collection functions: list.filter { it > 2 }.
- Extension functions add methods to existing classes.
💡 Real-life example: Kotlin is a polished version of Java: same engine, much shorter and safer to drive.
valRead-only variable
data classClass for holding data
?.Safe call operator
LambdaAnonymous function