Is it possible to add a closure to a list of elements?

In Swift, you can add a closure to a list of elements if the list's type matches the closure's type. For example, if you have an array of functions or closures with the same signature, you can store them in an array:

var closures: [() -> Void] = []

closures.append({
    print("Hello from closure")
})

closures.append {
    print("Another closure")
}

// Call all closures
for closure in closures {
    closure()
}

Thus, closures are first-class objects in Swift, and they can be stored in collections, passed around, and invoked.