Clean Code Principles Every Developer Should Know

Writing clean code isn't just about aesthetics — it's about making your codebase sustainable. Here are principles I follow in every project.

1. Meaningful Names

Variables, functions, and classes should reveal their intent:

// Bad
const d = new Date();
const fn = (u: any) => u.n;

// Good
const currentDate = new Date();
const getUserName = (user: User) => user.name;

2. Small Functions

Functions should do one thing and do it well. If a function is longer than 20 lines, it probably does too much.

// Instead of one large function
function processOrder(order: Order) {
  validateOrder(order);
  calculateTotal(order);
  applyDiscounts(order);
  sendConfirmation(order);
}

3. Don't Repeat Yourself (DRY)

Avoid duplicating logic. Extract common patterns into reusable functions or modules.

4. Comments Should Explain Why, Not What

Good code is self-documenting. Use comments for explaining why a decision was made, not what the code does:

// Bad: increments counter by 1
counter++;

// Good: retry count limited to 3 to avoid overwhelming the API
if (retryCount < MAX_RETRIES) {
  retryCount++;
}

5. Error Handling

Handle errors explicitly. Don't swallow exceptions or use empty catch blocks.

try {
  const data = await fetchUserData(userId);
  return processData(data);
} catch (error) {
  logger.error("Failed to fetch user data", { userId, error });
  throw new UserDataError("Unable to retrieve user information");
}

Conclusion

Clean code is a practice, not a destination. Start with these principles and refine your approach over time. Your future self — and your teammates — will thank you.