从OOP和FP看苹果Swift语言与Scala比较

// a copy of the f# fib implementation
func fib(n : Int) -> Int {
    if n == 0 || n == 1 {
        return n
    }
    else {
        return fib(n - 1) + fib(n - 2)
    }
}
 
// A simple print output function
let output = {(n: Array<Int>) -> () in
    for (index,value) in enumerate(n) {
        println("[\(index)] is \(value)")
    }
}
 
// Take an array of Ints, run fib on each in turn, filter just those %2 and then output the result
<p class="indent">[1,2,3,4,5,6,7,8,9,10]
|> map(fib)
|> filter({$0 % 2 == 0})
|> output
<p class="indent">

struct Card {
　var rank: Rank
　var suit: Suit
　func simpleDescription() -> String {
　　return "The \(rank.simpleDescription()) of \(suit.simpleDescription())"
　}
}
let threeOfSpades = Card(rank: .Three, suit: .Spades)
let threeOfSpadesDescription = threeOfSpades.simpleDescription()
<p class="indent">

class Order{
   String orderId;
   Double money;
  ..
}
<p class="indent">