switch文の分岐について
Switch
func f1(obj: AnyObject) -> AnyObject {
switch obj {
case let arr as NSArray:
return arr
case let dic as NSDictionary:
return dic
default:
return obj
}
}
obj
case let arr as NSArray:
return arr
case let dic as NSDictionary:
return dic
objcasttrue
case let arr as NSArray:
Optional Binding