Functional Programming For Dummies May 2026

: A function is "pure" if it always gives the same output for the same input and has no side effects (it doesn't change anything outside itself, like updating a database).

Functional programming (FP) is a style of coding where you treat software as a series of mathematical functions rather than a list of instructions. Instead of telling the computer to do something step-by-step, you describe what you want to happen. The Core Pillars of Functional Programming Functional Programming For Dummies

: You focus on the logic of what needs to be solved rather than the specific control flow (like for or while loops). Why Bother Learning It? : A function is "pure" if it always