ObjcCollectionsKeyValueFiltering/CollectionsKeyValueFiltering.m at master · n-b/ObjcCollectionsKeyValueFiltering · GitHub

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//
//  CollectionsKeyValueFiltering.m
//
//
//  Copyright (c) 2010-2013 Nicolas Bouilleaud.
//  http://bou.io/FilteringNSArrayWithKeyValueCoding
//

#import "CollectionsKeyValueFiltering.h"

@implementation NSArray (KeyValueFiltering)

- (id) firstObjectWithValue:(id)value forKeyPath:(NSString*)key
{
	for (id object in self) {
		if( [[object valueForKeyPath:key] isEqual:value] )
			return object;
	}
	return nil;
}

- (NSArray*) filteredArrayWithValue:(id)value forKeyPath:(NSString*)key
{
	NSMutableArray * objects = [NSMutableArray arrayWithCapacity:[self count]];

	for (id object in self) {
		if( [[object valueForKeyPath:key] isEqual:value] )
			[objects addObject:object];
	}

	return [NSArray arrayWithArray:objects];
}

@end


@implementation NSSet (KeyValueFiltering)

- (id) anyObjectWithValue:(id)value forKeyPath:(NSString*)key
{
	for (id object in self) {
		if( [[object valueForKeyPath:key] isEqual:value] )
			return object;
	}
	return nil;
}

- (NSSet*) filteredSetWithValue:(id)value forKeyPath:(NSString*)key
{
	NSMutableSet * objects = [NSMutableSet setWithCapacity:[self count]];

	for (id object in self) {
		if( [[object valueForKeyPath:key] isEqual:value] )
			[objects addObject:object];
	}

	return [NSSet setWithSet:objects];
}

@end