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Kotlin Fundamentals

A modern, null-safe language that runs on the JVM (and beyond) -- Android's preferred language, and increasingly used for backend services too. Each course below is independent -- start with whichever one fits what you want to learn.

Kotlin Fundamentals

A modern, null-safe JVM language -- from val/var and null safety through data classes, interfaces, collections, and an introduction to coroutines.

12 lessons6hbeginner
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  1. 1. Introduction to Kotlin and the JVM
  2. 2. val vs var and Basic Types
  3. 3. Control Flow: if as an Expression, when, and for
  4. 4. Null Safety
  5. 5. Functions, Default Arguments, and Lambdas
  6. 6. Classes and Primary Constructors
  7. 7. Data Classes
  8. 8. Interfaces and Inheritance
  9. 9. Collections: List, Map, and Functional Operations
  10. 10. Coroutines Fundamentals
  11. 11. Java Interop and Where Kotlin Is Used Today
  12. 12. Putting It Together: Designing a Small Kotlin Data Model