gistfile1.m

- (BOOL)containsObjectOfClass:(Class)class
{
    __block BOOL answer = NO;
    [self enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {
        if ([obj isKindOfClass:class]) {
            answer = YES;
            *stop = YES;
        }
    }];
    return answer;
}

// can I simplify the above with this?

- (BOOL)containsObjectOfClass:(Class)class
{
    [self enumerateObjectsUsingBlock:^(id obj, BOOL *stop) {
        if ([obj isKindOfClass:class]) {
            return YES;
        }
    }];
    return NO;
}