Conforming to protocol

You can add protocols to standard classes to extends their functionality:

@protocol EncodableToString <NSObject>
- (NSString *)toString;
@end

@interface NSDictionary (XYZExtended) <EncodableToString>
@end

@implementation NSDictionary (XYZExtended)
- (NSString *)toString {
    return self.description;
}
@end

where XYZ your project’s prefix

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