- update examples

- add examples for labeled tuples and computed properties

swift.html.markdown

@@ -224,6 +224,16 @@ let (_, price1, _) = pricesTuple // price1 == 3.69
 println(price1 == pricesTuple.1) // true
 println("Gas price: \(price)")
 
+// Named tuple params
+func getGasPrices2() -> (lowestPrice: Double, highestPrice: Double, midPrice: Double) {
+    return (1.77, 37.70, 7.37)
+}
+let pricesTuple2 = getGasPrices2()
+let price2 = pricesTuple2.lowestPrice
+let (_, price3, _) = pricesTuple2
+println(pricesTuple2.highestPrice == pricesTuple2.1) // true
+println("Highest gas price: \(pricesTuple2.highestPrice)")
+
 // Variadic Args
 func setup(numbers: Int...) {
     // its an array
@@ -337,6 +347,11 @@ internal class Rect: Shape {
         }
     }
     
+    // Computed properties must be declared as `var`, you know, cause they can change
+    var smallestSideLength: Int {
+        return self.sideLength - 1
+    }
+    
     // Lazily load a property
     // subShape remains nil (uninitialized) until getter called
     lazy var subShape = Rect(sideLength: 4)