Clean Code in JavaScript & TypeScript: 7 Refactoring Patterns

Writing clean code is essential for team scalability and long-term project maintainability.

1. Replace Deeply Nested Ifs with Guard Clauses

Instead of nesting logic inside deep conditional blocks, return early when invalid conditions are met:

// Bad
function processUser(user) {
  if (user) {
    if (user.isActive) {
      // process logic
    }
  }

// Good function processUser(user) { if (!user || !user.isActive) return; // process logic directly } ```