I'll Be Backend
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Principles

KISS

Turn a clever rule engine back into code you read top to bottom.

Pick your language

KISS: replace a rule engine with plain code in Java, step 2: The new rule has to sit in the right slotJava · ~5 minKISS in JavaKISS: replace a rule engine with plain code in C++, step 2: The new rule has to sit in the right slotC++ · ~5 minKISS in C++KISS: replace a rule engine with plain code in Python, step 2: The new rule has to sit in the right slotPython · ~5 minKISS in PythonKISS: replace a rule engine with plain code in PHP, step 2: The new rule has to sit in the right slotPHP · ~5 minKISS in PHP

When to use it

Use it when

An abstraction has one user and one configuration.

Skip it when

The rules truly vary at runtime, like per-garage pricing loaded from config or rules other teams plug in.

Spot it by

String keys looked up in a map, a loop over steps that never change, code you must run in your head.