A Few Things I Wish I'd Known Earlier About Functional Programming

Things That Make More Sense in Practice

FP avoids directly mutating data; instead, new data is built from existing data. Because pure functions have no side effects, they're much easier to test and reason about.

Why They Matter

Functional programming (FP) is built around pure functions: a function that always returns the same output for the same input. Tutorials often gloss over points like these, but they make a real difference on an actual project.