Enable modules and use them to import system frameworks: // #import <Cocoa/Cocoa.h> @import Cocoa; Use literals and subscripting methods: NSNumber *

Enable modules and use them to import system frameworks: // #import <Cocoa/Cocoa.h> @import Cocoa; Use literals and subscripting methods: NSNumber *yes = @YES; NSNumber *number = @42; NSArray *array = @[@"Hello", @"World"]; NSDictionary *dictionary = @{ @"name" : NSUserName() }; Learn about "instancetype": http://clang.llvm.org/docs/LanguageExtensions.html#objective-c-features http://clang.llvm.org/docs/LanguageExtensions.html#objective... Always use NS_ENUM and NS_OPTIONS to declare enum types: typedef NS_ENUM(NSInteger, HNExample) { HNExampleDefault, HNExample1, HNExample2 };