Kotlin - How to call nullable method with receiver only if it exists?

Question

I have a function that accepts an Article and nullable method with Article as its receiver. I want to call the nullable method and return its results only if it exists. How can I do this?

fun foo(article: Article, method: (Article.() -> String)? = null): String? =
    article?.method() // how can I do this?

Answer 1

fun foo(article: Article, method: (Article.() -> String)? = null): String? =
    method?.invoke(article)

or

fun foo(article: Article, method: (Article.() -> String)? = null): String? =
    method?.let { article.it() }