Is swift faster than objective c?
Is reference counting garbage collection?
what is gcd? What are advantages over nsthread?
What is strong and weak in objective c?
What is the isa member?
How dispatch_once runs only once?
Mention which class can you use for parsing of xml in iphone?
How can we put nil it into dictionary/array?
What is protocol with example?
Are id and instancetype same? If not, what are differences between them?
What are the size classes?
How do you write a good objective?
How do you check for leaks?
Who introduced objective-c & when?
Is struct a class?