each.swift

each.swift

import Foundation


protocol Enumerable {
    typealias Element
    
    func each( (Element) -> Void)
}

//-----------------------------

class Stack<T> : Enumerable {
    typealias Element = T
    
    var array: T[] = []
    
    func push(a: T) {
        array.append(a)
    }
    
    func pop() -> T {
        return array.removeLast()
    }
    
    func each(iterBlock: (T) -> Void) {
        for item in array.reverse() {
            iterBlock(item)
        }
    }
}

//-----------------------------

var s = Stack<String>()
s.push("... Bye")
s.push("World")
s.push("Hello")


s.each { a in
    println(a)
}

//-----------------------------

extension String : Enumerable {
    typealias Element = Character
    
    func each(iterBlock: (Character) -> Void) {
        for char in self {
            iterBlock(char)
        }
    }
}

"Hello".each { c in
    println(c)
}