validate same element from multiple records in single response

I have an API that will return x number of records.   For instance it may return all book written by author x.

The response will contain the number of books returned, such as 4 book written by author x.

I want to be able to validate the same elements, such as publisher, for each book record returned.

psudo code:

Get all book written by X.

-> 4 books returned.

Loop throw return response for each book

- Check book 1 was published by Z

- Check book 1 was published by Y

- Check book 1 was published by X

- Check book 1 was published by W

I've written a script to do this but is there another way to handle this sort of situation that is faster than written it for each call?

Thanks,

Billy