Thank you for engaging with my article 🙂
The mixed components were there when I started out. The starting point is the final version of the Tour of Heroes tutorial application.
In the related articles, I will show you step-by-step how to convert each mixed component into a container component, a presentational component and — for all but the simplest components— a presenter.
Take a look at “Container Components with Angular” to get started:
Isolate and extract app state and other non-presentational logic from Angular components.blog.angularindepth.com
TL;DR Mixed components are bad!
You can find links to the starting point (Tour of Heroes) in the Resources section of this article.