To me what makes functional programming matter and what differentiates it from OOP today is less its essential properties than the simple fact that it pushes yo

To me what makes functional programming matter and what differentiates it from OOP today is less its essential properties than the simple fact that it pushes you to think in terms of functions that process collections of objects rather than functions that act on a single one. This may look like a simple statement yet the implications are huge. Now it doesn't reflect a property of FP as such, it only highlights one of the biggest shortcomings of OOP along mutability that we are slowly awakening to as a community.