In what way? I've recently started writing in Swift and I find it to be less powerful than Kotlin. One such feature that's missing: extension expressions. Allows things like `let` and `with` from the kotlin stdlib
inline fun <T, R> with(receiver: T, f: T.() -> R): R
with(list) {
add(item)
add(item)
}
Another thing that's bit me in butt recently is that `Protocol`s aren't concrete types, unlike an `interface` in Java/Kotlin.