Pure Functional programming’s cost comes up front when you are trying to solve and express your solution. Imperative programming’s cost comes after you have wri

Pure Functional programming’s cost comes up front when you are trying to solve and express your solution. Imperative programming’s cost comes after you have written code, because it is inevitably buggy and incorrect. Imperative programmers and managers don’t mind because fixing bugs feels and looks like productive work, and they don’t believe bugs are largely avoidable.