Kotlin calling non final function in constructor works

Question

In Kotlin, it warns you when calling an abstract function in a constructor, citing the following problematic code:

abstract class Base {
    var code = calculate         


        

Answer 1

To invoke the functions of the concrete classes in the abstract class use by lazy which allows calling non-final functions.

From: area = extractArea(room);

To: area by lazy { extractArea(room) }

GL