That's my point, we don't have much more than that. Even a 2-arg function is missing. You can supplement with something like Vavr or just write your own, but ev

That's my point, we don't have much more than that. Even a 2-arg function is missing. You can supplement with something like Vavr or just write your own, but even then it's not pleasant to read "Function3<A, B, C, D>". Typescript, Kotlin, and Scala all do this way better. Here's an example from Kotlin (it's an extension function, but focus on the combiner lambda): fun <T, R> Collection<T>.fold( initial: R, combine: (acc: R, nextElement: T) -> R ): R { .... }