A modern programming language that makes developers happier.

kotlinlang

<@U66SV6HSQ> you could create your own List-Type and use delegation
```
class MyImmutableList&lt;T&gt;(private val list: List&lt;T&gt;): List&lt;T&gt; by list
```
then the user won't be able to cast your list into a `MutableList` and therefore won't be able to edit it

isn't that just a reinvention of Collections.unmodifiableList ?

(which would also do things like protecting against calling remove() on the iterator, for example)

they are pretty similar, my example prohibits the cast to `MutableList&lt;T&gt;`, `Collections.unmodifiableList` just throws an exception when you call `add`