Question

I am learning Objective C . I was given a code to fix that I have fixed but not entirely sure what was going on though. Can some please explain what is following code doing.

 //in header file  there is this line
 @property (retain) NSMutableArray *anArray;  

  // In implementation file in a method
  self.anArray = [NSMutableArray array];
  //This assigns a large value to index . What is this value. Does NSIteger needs initialization I think default is 0 
  NSInteger _nextIndex = (NSInteger)[self.anArray];

Answer 1

You’re typecasting the pointer pointing to self.anArray to an NSInteger. In other words, _nextIndex contains the address at which self.anArray is stored.