How would you rate your knowledge of object-oriented programming principles on a scale from 1 to 5?

Assessment of knowledge of object-oriented programming (OOP) principles is subjective, but can be guided by the following levels:

1 — basic understanding of terms (class, object). 2 — knowledge of main principles: encapsulation, inheritance, polymorphism. 3 — ability to apply OOP in simple tasks. 4 — confident use of OOP for designing application architecture. 5 — deep understanding of design patterns and experience solving complex problems with OOP.

If you are just starting out, your level is likely 1-2. If you regularly code in Flutter using classes and inheritance, you might be at levels 3-4.