// 4 articles available
NSError is the standard error handling mechanism in Objective-C, but using it defensively requires more than just passing a pointer. Learn patterns that prevent crashes and make debugging easier.
Both let you add methods to classes, but categories and class extensions serve different purposes. Here's when to use each.
Objective-C lacks namespaces, so the community invented conventions. Here's how prefixes and other patterns help avoid collisions in a flat symbol space.
Objective-C supports exception handling with @try/@catch, but the community settled on NSError pointers instead. Here's why.