How to separate reducers and state in redux?

Question

React

Good evening, plunging into redax got confused.

I can’t understand when it’s worth separating the reducer and state if I have 1 entity, but different data, for example:

The Article entity, there may be 1 article, or there may be a whole list, respectively, the data in the state is different:

articles: [], // для списка статей
article: {} // для одной статьи

It turns out that the reducer will be 2, for the List of Articles and for One Article?

Isn't it redundant?

Answer 1

Is it forbidden to implement an array of objects and walk through it in the country?