Consider the following code output when the file doesn’t exist?

import UIKit

 let filename:String = "testfile";

var readdata:String = "test data";

 let pathname = NSURL(fileURLWithPath: "..") URLByAppendingPathComponent(filename) ;

do {

             readdata = try NSString(contentsOfURL: pathname, encoding:NSUTF8StringEncoding)            as String } catch { print("read error")

}

print(readdata);

Extensions can add new instance ____?

Output? import UIKit var str1:String?='text1'; var str2:String='text2'; var int1:Int?=111; var int2:Int=222; var array:String[] = [str1, str2, int1, int2]; array=[];

Use the classes defined above to create a new Person instance, and try to access its numberOfRooms property as before?

Problem with code? import UIKit let fm = NSFileManager.defaultManager() fm.removeItemAtPath('file.old')

Problem in following code? import UIKit ; var intVar:Int?=3; intVar = nil; var strVar:String; strVar = nil;

Which is not a control transfer statement in Swift?

Which keyword do you use to define a class?

What is a mutating instance method in Swift?

If we have a class named MyClass with a nested enum called Status, declared like so: class MyClass { enum Status { case On, Off } }

To declare a constant in Swift you would use: