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// NSSet+Core.m

// Core Resource

// Created by Mike Laurence on 2/5/10.

#import "NSSet+Core.h"

@implementation NSSet (Core)

- (NSSet*) intersection:(NSSet*)otherSet {

NSMutableSet *intersection = [self mutableCopy];

[intersection intersectSet:otherSet];

return [intersection autorelease];

}

- (NSSet*) difference:(NSSet*)otherSet {

NSMutableSet *difference = [self mutableCopy];

[difference minusSet:otherSet];

return [difference autorelease];

}

- (id) objectOfClass:(Class)clazz {

for (id obj in self) {

if ([obj isKindOfClass:clazz])

return obj;

}

return nil;

}

- (id) firstObject{

return [[self allObjects] count] > 0 ? [[self allObjects] objectAtIndex:0] : nil;

}

- (id) lastObject{

return [[self allObjects] count] > 0 ? [[self allObjects] objectAtIndex:([self count] -1)] : nil;

}

@end