Where to put custom loop functions?

To display a lot of arrays in different ways on a page, I need to loop through them. These arrays are generated by a module class. I am aware that it's not recommended to include functions on views, so I am looking for the best place to insert the functions file.

I understand that I can extend helpers, but I don't want to do that. Instead, I would like to create a custom helper file for my loop functions, which I will call loops_helper.php.

A helper or place in Common.php

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