1. What is Regular expressions?
The special string patterns that describe how to search through a string are called Regular expressions.2. What is the difference between Synchronous & Asynchronous task?
Synchronous: waits until the task has completed Asynchronous: completes a task in background and can notify you when complete3. What is B-Trees?
B-trees are search trees which provide an ordered key-value store with excellent performance characteristics. In principle, each node maintains a sorted array of its own elements, and another array for its children.4. What is made up of NSError object?
NSError object a domain, an error code, and a user info dictionary. The domain is a string that identifies what kind of errors is coming from.5. What is Enum?
Enum is a type that generally contains a group of related values in same umbrella.6. What is the difference strong, weak, read only and copy?
Strong, weak, assign property ascribes define how memory for that property will be managed.Strong means that the reference count will be increased and the reference to it will be maintained through the life of the object
Weak, means that we are pointing to an object but not increasing its reference count. It’s often used when creating a parent child relationship. The parent has a strong reference to the child but the child only has a weak reference to the parent.
7. What is Dynamic Dispatch?
Dynamic Dispatch is the process of selecting and implementation of a polymorphic operation that’s a method or a function to call at run time.8. How to Prioritize Usability in Design?
Broke down its design process to prioritize usability in 4 steps:9. What is Responder Chain?
A Responder Chain is a hierarchy of objects that have the chance to respond the events received.10. What is TVMLKit?
TVMLKit is a glue which link TVML, JavaScript, and native tvOS application.11. What is Platform limitations of tvOS?
tvOS first provides no browser support of any kind, nor is there any WebKit or other web-based rendering engine you can program against. This means your app can’t link out to a web browser for anything, including web links, OAuth, or social media sites.Second, tvOS apps cannot explicitly use local storage. At product launch, the devices ship with either 32 GB or 64 GB of hard drive space, but apps are not permitted to write directly to the on-board storage.
tvOS app bundle cannot exceed 4 GB.
12. What is ABI?
ABIs are important to applications that use external libraries. If a program is built to use a particular library and that library is later updated, you don’t have to re-compile that application (and from the end-user’s standpoint, you may not have the source).13. What is Facade Design Pattern?
Which provides a single interface to a complex subsystem are called Facade design pattern. Instead of exposing the user to a set of classes and their APIs, you only expose one simple unified API.14. What is Adapter Pattern?
An Adapter which allows classes with incompatible interfaces to work together is called Adapter pattern. It wraps itself around an object and exposes a standard interface to interact with that object.15. What is JSON/PLIST limits?
16. What is SQLite limits?
17. What is defer?
Defer is a keyword which carries a block of code that will be executed in the case when execution is leaving the current scope.18. What is Concurrency?
Concurrency is splitting up the execution paths of the program so that they are possibly running at the same time.The common terminology: process, thread, multithreading, and others. Terminology;
19. Explain Swift’s pattern matching techniques
20. What are the benefits of Guard?
There are two big benefits of guard are:-One is avoiding the pyramid of doom, as others have mentioned — lots of difficult if let statements nested inside each other moving further and further to the right. The other benefit is provide an early exit out of the function using break or using return.
