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1. Filter an NSArray with NSPredicate

   - (NSString *)stringWithoutComments:(NSString *)string {
       NSArray *inputLines = [string componentsSeparatedByString:@"\n"];
       NSPredicate *commentsPredicate = [NSPredicate predicateWithFormat: @"SELF beginswith %@", @"--"];
       NSPredicate *notCommentsPredicate = [NSCompoundPredicate notPredicateWithSubpredicate:commentsPredicate];
       NSArray *filteredLines = [inputLines filteredArrayUsingPredicate:notCommentsPredicate];
       return [filteredLines componentsJoinedByString:@"\n"];
   }