Для чего, вне циклов, нужен in в swift?

Question

[Владислав Хвостов]

Вот тут например

router.get("/") {
    request, response, next in
    response.send("Hello, World!")
    next()
}

Comments

[Kovalsky]

Кажется, тут объяснено, но я не вникал, могу ошибаться 0_0

Answer 1

[DevMan]

The start of the closure’s body is introduced by the in keyword. This keyword indicates that the definition of the closure’s parameters and return type has finished, and the body of the closure is about to begin.

замыкания