What aspect of iOS development requires the use of NSOperation and/or Grand Central Dispatch (GCD)?

Which of following expressions can be used to rewrite the following UITableView instantiation in Swift UITableView *myTableView = [[UITableView alloc] initWithFrame: CGRectZero style: UITableViewStyleGrouped];

What will happen if you assign a value to a property within its own didSet observer?

Which of the following is correct to cube Integer?

In what queue should all UI code be handled?

In what order will the following statements appear in the console? println('1') dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY _DEFAULT, 0), {println('2')}); println('3')

Instance methods can be _____ in extension

Which of the following are true about extension functionalities?

extension Int { subscript(var myInt: Int) -> Int { var no1 = 1 while myInt > 0 { no1 *= 10 --myInt } return (self / no1) % 10 } } print(12[0]) What is the output?

After importing Objective-C code to Swift, the above method will be imported as (instancetype)initWithFrame:(CGRect)frame style:(UITableViewStyle)style;

Objective-C class can be instantiated in Swift class only through