iOS Development

 Q1. 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 complete

 Q2. What Are B-Trees? ?

• B-trees are search trees that 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.

 Q3. What is bounding box?

• Bounding box is a term used in geometry; it refers to the smallest measure (area or volume) within which a given set of points.

 Q4. Explain subscripts ?

• Classes, structures, and enumerations can define subscripts, which are shortcuts for accessing the member elements of a collection, list, or sequence..

 Q5. What is Dynamic Dispatch ?

• Dynamic Dispatch is the process of selecting which implementation of a polymorphic operation that’s a method or a function to call at run time. This means, that when we wanna invoke our methods like object method. but Swift does not default to dynamic dispatch

 Q6.What’s Code Coverage ?

• Code coverage is a metric that helps us to measure the value of our unit tests.

 Q7.What’s Completion Handler ?

• Completion handlers are super convenient when our app is making an API call, and we need to do something when that task is done, like updating the UI to show the data from the API call. We’ll see completion handlers in Apple’s APIs like dataTaskWithRequest and they can be pretty handy in your own code.
• The completion handler takes a chunk of code with 3 arguments:(NSData?, NSURLResponse?, NSError?) that returns nothing: Void. It’s a closure.

 Q8. What is Responder Chain ?

• A ResponderChain is a hierarchy of objects that have the opportunity to respond to events received.

 Q9. What is Regular expressions ?

• Regular expressions are special string patterns that describe how to search through a string.

 Q10. What is TVMLKit ?

• TVMLKit is the glue between TVML, JavaScript, and your native tvOS application.

 Q11. What is ABI ?

• ABIs are important when it comes 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 want to have to re-compile that application (and from the end-user’s standpoint, you may not have the source). If the updated library uses the same ABI, then your program will not need to change

 Q12. hat is Facade Design Pattern ?

• The Facade design pattern provides a single interface to a complex subsystem. Instead of exposing the user to a set of classes and their APIs, you only expose one simple unified API.