[dthul]

Note that in Kotlin the return type is `Int?`, not `Int`. You can't forget to check for null because the compiler enforces it.

To your first point: Another example in the design space would be Rust which works very similarly to Kotlin but returns more information in the failure case.

[zvrba]

> Note that in Kotlin the return type is `Int?`, not `Int`.

How does that fare with unnecessary boxing of primitives?

[kreetx]

If the function isn't total (as in: for every string there is an int) then the boxing is necessary, no?

[zvrba]

Not if you have user-defined value types (soon coming to Java).