Essential Books

Specifying Generics

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You can enhance your own classes with generics just like NSArray or NSDictionary. 

@interface MyClass<__covariant T>

@property (nonnull, nonatomic, strong, readonly) NSArray<T>* allObjects;

- (void) addObject:(nonnull T)obj;

@end
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Classes and objects:
*Classes and Objects
*Difference between allocation and initialization
*Creating classes with initialization values
*Singleton Class
*The instancetype return type
*Specifying Generics
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