What is the most idiomatic way of expressing a cla...

# getting-started

[Victor Cardona]

What is the most idiomatic way of expressing a class hierarchy in Kotlin? I found this blog post which used delegation, but I have heard that delegation is not a feature that many developers choose to use. Though in this case I can’t see the downside to it. My specific use case is a set of immutable classes where sub classes add additional properties only. Thanks!

[Dico]

The most idiomatic way to express a hierarchy of classes is by using plain inheritance.

[Dico]

You may or may not want to partially flatten your hierarchy using composition.

[Dico]

Delegation is interesting but not necessary to express composition, you can do this with class properties.

[Victor Cardona]

True that you don’t need to use delegation to implement composition, but delegation does allow you to forgo chaining calls to properties: A.prop instead of A.B.prop. Well at least without having to write custom accessors.