What does the following code?

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;

Compare the below code and what will result? import UIKit var rank:Dictionary = [1:'First', 2: 'Second', 3: 'Third']; rank.updateValue('Forth', forKey: 4);

On which tag background color for the page can be set?

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:

Can Structures be type cast in Swift?

Output of this segment of code: var x = 0 for index in 1...5 { ++x } print('(x)')