#import <Foundation/Foundation.h>

@interface NSArray (utils)

- (NSArray *)intersect:(NSArray *)array withPropertyName:(NSString *)propertyName;

- (NSArray *)difference:(NSArray *)array withPropertyName:(NSString *)propertyName;

- (NSArray *)mapObjectsUsingBlock:(id (^)(id obj, NSUInteger idx))block;

- (NSArray *)sortByPropertyName:(NSString *)propertyName;

@end