Apple Swift: String enums, switch ranges, Printable protocol (description property)

[swift]enum-range-printable.swift

// Playground - noun: a place where people can play

import UIKit

enum State : String {
    case ASLEEP = "asleep",
    AWAKE = "awake",
    DRUNK = "drunk"
}

// Printable means there's a 'description' property
class Person : Printable {
    init(name:String) {
        self.name = name;
    }
    
    // Computed property - this forms a get
    var status: State {
        let num = rand() % 10;
            
        switch num {
            case 0..<3:
                return State.ASLEEP
            case 3..<6:
                return State.AWAKE
            default:
                return State.DRUNK
        }
    }
    
    var description: String {
        // toRaw is required for it to print the String value (e.g. 'awake'). Otherwise it prints (Enum Value) unhelpfully!
        return "\(name) is \(status.toRaw())"
    }
    
    var name:String;
}

var states = "";

// repeat 10 times. toRaw gives us the String value of the enum
for i in 0..<10 {
    let name = "Person"+String(format: "%02d", i)
    states += " \(Person(name:name).description) "
    // Note: shouldn't need to call description here (i think) but Playgrounds needs us to
}

println(states);