Trying to convert some java code to kotlin, given the following method
public class Option<T> {
public <U> Option<U> map(Function<T, U> mapper) {
throw new IllegalStateException();
}
}
kotlin conversion will give this
I cannot understand whats the problem here, and how do i create equivalent method in kotlin? (thats the java.util.Function
)
PS could not come up with some better question summary... feel free to change.
To use java.util.function.Function
, you have to import it explicitly:
import java.util.function.Function
That's because by default Function
is resolved to kotlin.Function
.
But there are function types in Kotlin, and more idiomatic implementation would be
fun <U> map(mapper: (T) -> U): Option<U> {
// ...
}
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