enums and protocol

Question

can anyone explain how to use it!?

Answer 1

enum {
case North
case South
case East
case West

}

Answer 2

Here is a chunk of code That I created for you.
It moves a character back and forth 3 times printing when the edge of the screen is reached and switch the direction. After the third iteration it stops and tellls that the race is completed:

http://swiftlang.ng.bluemix.net/#/repl/57c64a92c62de72752d32274