Objective-C @Property dot syntax

WHYPerson.m

#import "WHYPerson.h"
...

@implmentation WHYPerson
...

- (NSString *)doSomething {
  return [NSString stringWithFormat:@"Hello, %@", [self firstName]];
  
  // Can also be done using dot syntax as it's just a wrapper around [self firstName]
  // This works too:
  // return [NSString stringWithFormat:@"Hello, %@", self.firstName];
}

...
@end