Functional programming, at its heart, is about imposing a particular kind of constraints with the hope that it will have an impact on program quality. The evide

Functional programming, at its heart, is about imposing a particular kind of constraints with the hope that it will have an impact on program quality. The evidence does not suggest that FP is successful at that goal. Its chosen constraints are likely the wrong ones. There are a few programming paradigms that are "about constraints," and perhaps one of them will end up making a big difference, but it appears FP is not the one.