Clean Code: 8 Tips to Write Clean Functions 🔥

🧼 8 Practical Tips for Writing Clean Functions

1. Keep Functions Small & Focused

• Each function should do one thing well.

• If you describe it with “and,” it likely does too much.

2. Name Functions to Reveal Intent

• Use action verbs and domain-specific language.

• Boolean functions should start with is, has, or can.

3. Return Early to Avoid Nesting

• Use guard clauses to handle edge cases upfront.

• Keeps the “happy path” clear and readable.

4. Limit Function Parameters

• Too many parameters = cognitive overload.

• Group related ones into objects to simplify calls.

5. Write Pure Functions When Possible

• Avoid side effects.

• Pure functions are predictable, testable, and parallelizable.

6. Avoid Boolean Parameters

• They obscure intent and often signal dual responsibilities.

• Use enums or split into separate functions.

7. Return Results, Not Exceptions

• Use the Result Pattern for expected errors.

• Reserve exceptions for truly exceptional cases.

8. Replace Magic Numbers & Strings

• Extract constants and enums to improve readability and maintainability.

🧠 Final Thought

Clean functions are the foundation of clean code. They reduce bugs, speed up reviews, and make your software easier to evolve. Petar’s advice: Be pragmatic, not dogmatic.