How would you implement inheritance between two classes in Kotlin?

open class BaseClass {
    // Base class, must be open for inheritance
    fun baseMethod() {
        // Method of the base class
    }
}

class DerivedClass : BaseClass() {
    // Derived class inherits from BaseClass using a colon
    fun derivedMethod() {
        // Method of the derived class
        baseMethod() // Call to the base class method
    }
}

In Kotlin, classes are closed (final) by default. To make a class inheritable, it must be marked with the open keyword. Inheritance is specified after the class name using a colon, followed by the name of the base class with parentheses (if there is a primary constructor).