iOS: Using an NSPredicate for filtering an array

ios_predicate_filter.txt

NSArray *retailerList = ((RetailerDetailsResponseV1*)[RetailerDetailsResponseV1 readFromFile:kBNCloudFileNameRetailers]).retailerList;
if (retailerList.count > 0) {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"retailerId != [cd] %@ AND countryId == [cd] %@", @"NOK", countryCode];
    NSArray *retailer = [retailerList filteredArrayUsingPredicate:predicate];
    
    if (retailer) {
        return [[retailer objectAtIndex:0] valueForKey:@"retailerId"];
    }            
}