What are some common challenges functional programmers face when working on large-scale projects?

Functional Programmers often encounter challenges in integrating functional code with legacy object-oriented systems and ensuring that team members are comfortable with functional paradigms. Managing state and side effects in a purely functional way can also require careful architectural planning, especially as the codebase grows. Collaboration with colleagues from different programming backgrounds may involve additional communication to align on best practices and ensure maintainability. Staying up to date with evolving functional libraries and tools is also key to overcoming these challenges.