How do I initialize Kotlin’s MutableList to empty MutableList?

by

You can simply write:

val mutableList = mutableListOf<Kolory>()

This is the most idiomatic way.

Alternative ways are

val mutableList : MutableList<Kolory> = arrayListOf()

or

val mutableList : MutableList<Kolory> = ArrayList()

This is exploiting the fact that java types like ArrayList are implicitly implementing the type MutableList via a compiler trick.

More Related Contents:

  1. Smart cast to ‘Type’ is impossible, because ‘variable’ is a mutable property that could have been changed by this time
  2. How to write ternary conditional operator?
  3. Jooq fetchInto with default value if field is null
  4. Kotlin: how to pass a function as parameter to another?
  5. What does ?: do in Kotlin? (Elvis Operator)
  6. Is Kotlin “pass-by-value” or “pass-by-reference”?
  7. What is the Kotlin double-bang (!!) operator?
  8. Multiple variable let in Kotlin
  9. How can I detect a click with the view behind a Jetpack Compose Button?
  10. When should one prefer Kotlin extension functions?
  11. How to create a fat JAR with Gradle Kotlin script?
  12. how to run compiled class file in Kotlin?
  13. Web scraping with jsoup in Kotlin
  14. Getters and Setters in Kotlin
  15. Why does this Kotlin method have enclosing backticks?
  16. Why does mutableStateOf without remember work sometimes?
  17. IntArray vs Array in Kotlin
  18. How to clone object in Kotlin?
  19. Override getter for Kotlin data class
  20. Cross references in type parameters
  21. Sort collection by multiple fields in Kotlin [duplicate]
  22. Coroutines: runBlocking vs coroutineScope
  23. How can one add static methods to Java classes in Kotlin
  24. Difference between ArrayList() and mutableListOf() in Kotlin
  25. Kotlin doesn’t see Java Lombok accessors?
  26. Building a self-executable JAR with Gradle and Kotlin
  27. 0xFF0000FF An integer literal does not conform to the expected type kotlin.Int
  28. How does erasure work in Kotlin?
  29. What does .() mean in Kotlin?
  30. Kotlin Ternary Conditional Operator

Leave a Comment