The Pragmatist's Guide to Functional Programming: Macro over Micro

This essay argues against a purely micro-level application of functional programming principles in imperative languages. While acknowledging the benefits of functional programming, the author contends that obsessively replacing for loops with maps and reduces without addressing higher-level architectural concerns often yields minimal gains or even negative results. The true value lies in adopting macro-level principles like managing mutation, simplifying architecture, and strengthening type systems. The author advocates for a pragmatic approach, prioritizing architectural design and code quality over strict adherence to functional micro-styles, suggesting a portfolio of 80/20 solutions often surpasses a single 100/100 approach.