Swift Bind (Non-Optional Let Expression)

Bind.swift

// Let's start with an example!
bind(view.frame.size) { size in
    println("The area is \(size.width * size.height)")
}

// Without bind, this code would look like this
// let size = view.frame.size
// println("The area is \(size.width * size.height)")

// Note how bind cleans up code that accesses the same variable
// multiple times. Much nicer. It restricts the scope too,
// making this preferable to a seperate let binding.

// Ideally, swift would support
// let size = view.frame.size {
//     println("The area is \(size.width * size.height)")
// }
// but since it doesn't, this is the best we get.

// Even cooler would be a construct like this
// bind view.fram.size {
//     println("The area is \(.width * .height)")
// }
// but I doubt we will get support for anything like that.
// Also, that might conflict with enum syntax. #awk

// The implementation is actually really simple:
func bind<T>(value: T, action: T -> ()) {
    action(value)
}