Essential Objective-C

Custom Subscripting

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You can add subscripting to your own classes by implementing the required methods.

For indexed subscripting (like arrays): 

- (id)objectAtIndexedSubscript:(NSUInteger)idx
- (void)setObject:(id)obj atIndexedSubscript:(NSUInteger)idx

For keyed subscripting (like dictionaries): 

- (id)objectForKeyedSubscript:(id)key
- (void)setObject:(id)obj forKeyedSubscript:(id <NSCopying>)key
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