Hello, I have a java function with following signature:

public static ScoreDto score(String email, String name, String surname, Function<String, Boolean> function)

What would be the idiomatic/more readable approach to call it from Kotlin, given that

dataProvider

is a nullable instance of class that implements Function<String, Boolean>?

score(
        "<mailto:some_email@domain.com|some_email@domain.com>",
        "John",
        "Doe"
    ) { dataProvider?.apply(it) }

vs

score(
        "<mailto:some_email@domain.com|some_email@domain.com>",
        "John",
        "Doe",
        { dataProvider?.apply(it) }
     )

vs

dataProvider?.let {
    score(
       "<mailto:some_email@domain.com|some_email@domain.com>"
        "John",
        "Doe",
        it
    )
}

The last one has different semantics than the first two. It doesn't call the function if the provider is null. The first is more idiomatic than the second I'd say.

oh I didn't even realize that. Thank you

The first form is definitely the most idiomatic. — side note: the last parameter in the Java signature could be simplified to

Predicate<String> function

.