nsarray additions

mehaddition+nsarray.m

@implementation NSArray (Mehdditions)

- (NSArray*) filter:(BOOL (^)(id)) block {
    NSMutableArray* result = [NSMutableArray new];
    for (id item in self)
        if (block(item))
            [result addObject:item];
    return result;
}

- (NSArray*) map:(id (^)(id)) block {
    NSMutableArray* result = [NSMutableArray new];
    for (id item in self)
        [result addObject:block(item)];
    return result;
}

- (id) reduce:(id) value block:(id (^)(id, id)) aBlock {
    id result = value;
    for (id item in self)
        result = aBlock(result, item);
    return result;
}

@end