Swift new features - notes

1. you can print enums 

enum Animals {
  case Dog, Cat, Troll, Dragon
}

let a = Animals.Dragon
print(A)

2. Associated values in Enums
enum Either<T1, T2> {
  case First(T1)
  case Second(T2)
}

3. Recursive Enums- 
Enums in swift are simply algeabraic data types
enum Tree<T> {
 case Leaf(T)
 indirect case Node(Tree, Tree)
}

4. Do Statement - to define an explicit scope
imp in error handling
do{
let a = Animals.Troll
...
}

instead of do while use repeat
repeat {
 ...
}


5. Option Sets
viewAnimationOptions = [.Repeat, .CurveEaseIn, .TransitionCurlUp]
viewAnimationOptions = []
if viewAnimationOptions.contains(.TransitionCurlUp) {