How to request the original photo in api vk?

Question

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There is such a method
https://vk.com/dev/photos.get?params[album_id]=wal...
it gives all options for photo sizes, everything would be fine, but on different accounts the sizes in the array are located differently .. either I don't understand something here, or the one who came up with it was, to put it mildly, mistaken))) Is there any easy way to immediately request a link to the original photo or to the largest one without sorting through the entire array?
Here is more about the array
https://vk.com/dev/objects/photo_sizes
I am sending not for someone to study for me, but for them to understand that I read it and libor did not understand how to do it in a simple way or it is not written there.

Answer 1

Maybe some function like this:

var getLargePhoto = function (photo) {
  return photo.photo_2560 || photo.photo_1280 || photo.photo_807 || photo.photo_604 || photo.photo_130 || photo.photo_75;
};