Transformations, functors, categories

https://muratkasimov.art/Ya/Articles/Transformations,-functors,-categories/ This order in the title is not accidental - functors start making sence in context of natural transformations and categories are rarely interesting without reasoning in terms of mappings between them i.e. functors. In this article I briefly introduce these concepts and demonstrate how to use other categories in Я besides Arrow (regular functions) - Scope category and Event precategory; along how they are related to each other.