<https://kotlinlang.org/docs/reference/generics.ht...

# getting-started

[Shawn]

https://kotlinlang.org/docs/reference/generics.html#declaration-site-variance

[Florian]

I've already read up on it, I am trying to clarify my understanding with a question that I phrased very simple and straight forward on purpose

[Florian]

since this topic is quite difficult

[Shawn]

imo the kotlin docs are the best way I’ve seen variance explained, at least, within an applied context.

[Shawn]

moreover,

creating an Array<out T> means that I can pass subtypes of T?

is not a question with a yes/no answer - pass could mean a couple of things here, such as assignment, declaration, or invoking a function - all of which concern variance

[Shawn]

that doc page describes the various ways out can affect a generic type and how you use it

[Florian]

I see, thanks

[Shawn]

if you’re looking to learn more about covariance and contravariance, the wiki page on it isn’t bad, and provides plenty of further reading - but if you’re having a hard time grokking blog posts, then I’d say you should literally just try writing a generic class and seeing what you can and cannot do with those type projections

[Shawn]

a toy linkedlist class or something similar would let you gain a bit more insight as to what the type system is trying to allow or prevent you from doing when using these markers