gistfile1.txt

class Horse {
	var name:String?
	var beenThroughDesert:Bool = false
	init(){}
	init(horsename:String?, desert:Bool) {
		if let n = horsename {
			name = n
		}
		beenThroughDesert = desert
	}
}



func identifyHorse( horse: Horse? ) -> String {

	var horseid:String

	switch horse {
		
		case let h where h?.name? == "Ed":
			horseid = "It's Mr Ed, of course."
		
		case let h where h?.name? == "Champion":
			horseid = "It's Champion the wonder horse!"
		
		case let h where (h?.name? == nil) && (h?.beenThroughDesert == false):
			horseid = "It's a mysterious but untested horse."
		
		case let h where (h?.name? == nil) && (h?.beenThroughDesert == true):
			horseid = "It's the horse with no name!"
		
		case let h where h? == nil:
			horseid = "There is no horse"
		
		default:
			horseid = "I don't know this horse."
	}
	
	return horseid
}



var mred     = Horse(horsename: "Ed", desert: false)
var champion = Horse(horsename: "Champion", desert: false)
var hwnn     = Horse(horsename: nil, desert: false)
var myst     = Horse(horsename: nil, desert: false)



identifyHorse(mred)      // It's Mr Ed, of course.
identifyHorse(champion)  // It's Champion the Wonder Horse!
identifyHorse(myst)      // It's a mysterious but untested horse
identifyHorse(hwnn)      // It's the horse with no name!

var nohorse:Horse?
identifyHorse(nohorse)   // There is no horse