Key Programming Principles: KISS, DRY, YAGNI, and Code for the Maintainer

Programming principles such as KISS (Keep It Simple Stupid), DRY (Don’t Repeat Yourself), YAGNI (You Aren’t Gonna Need It), and “Code For The Maintainer” are presented as essential guidelines for writing clean, maintainable code.

The article explains the origin of KISS, its emphasis on simplicity, and provides examples from aerospace engineering, linking it to concepts like Occam’s razor and Einstein’s advice.

DRY is described as avoiding duplication in code, documentation, data, and effort, with advice on when over‑applying it can harm cohesion.

YAGNI is introduced as a principle of implementing features only when they are truly needed, highlighting its impact on development speed, testing, and resource usage.

Additional practical tips include keeping methods short (30‑40 lines), breaking tasks into 4‑12 hour sub‑tasks, writing self‑explanatory code, and avoiding premature optimization.

The article also lists related design principles such as the Single Responsibility Principle, Open/Closed Principle, Law of Demeter, and encourages developers to communicate clearly between code and people.

References and further reading links are provided at the end.