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KISS

What's KISS​

KISS stands for Keep It Simple and Stupid — a key design principle in software engineering (and many other fields). It promotes simplicity over unnecessary complexity.

The Core Idea​

tip

The simplest solution is often the best one.

  • Don't overengineer.
  • Don’t add things you might need later.
  • Aim for clarity, not cleverness.

Example (Scala)​

  • Without KISS – Overengineered
def add(a: Int, b: Int): Int = {
  val result = Some(a + b)
  result.getOrElse(throw new RuntimeException("Unexpected error"))
}
  • With KISS – Simple and clear
def add(a: Int, b: Int): Int = a + b

Common Violations of KISS​

  • Adding design patterns where they're not needed
  • Overuse of abstractions or indirection
  • Overengineering for features that don't exist yet

Summary​

KISS reminds us to avoid complexity for its own sake. In practice, it means writing clean, direct code that does the job — and nothing more.