How does functional programming differ from object-oriented programming? What approach do you use?

Functional programming (FP) and object-oriented programming (OOP) are different paradigms with different approaches to organizing code.

• Functional programming is based on the use of pure functions that have no side effects and always return the same result for the same inputs. FP widely uses higher-order functions, immutability of data, and recursion instead of loops.

• Object-oriented programming is built around objects that combine state (data) and behavior (methods). The main principles are encapsulation, inheritance, and polymorphism.

In my approach, I combine both styles: I use OOP for modeling the domain and managing state, and functional concepts for data processing, writing pure functions, and reducing side effects. For example, in Python, I apply higher-order functions, generators, and list comprehensions for clean and expressive collection processing.