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Best Practices

This document outlines the best practices followed in the CryptoTrackPro project.

Code Organization​

  1. Feature-Based Structure: Code is organized by feature rather than by type
  2. Component Composition: Using smaller components to build larger ones
  3. Separation of Concerns: Keeping UI, state management, and business logic separate

TypeScript Best Practices​

  1. Strong Typing: Using explicit types rather than any
  2. Interface Segregation: Creating focused interfaces
  3. Type Guards: Implementing proper type guards for safer code
  4. Discriminated Unions: Using tagged union types for complex state
// Example of discriminated union for auth state
type AuthState = 
  | { status: 'authenticated'; user: User; token: string }
  | { status: 'unauthenticated'; user: null; token: null }
  | { status: 'loading' };

React Best Practices​

  1. Functional Components: Using functional components with hooks
  2. Custom Hooks: Extracting reusable logic into custom hooks
  3. Memoization: Using React.memo, useMemo, and useCallback where appropriate
  4. Error Boundaries: Implementing error boundaries to catch rendering errors
  5. Key Props: Using stable keys for lists
// Custom hook for debouncing
export function useDebounce<T>(value: T, delay: number): T {
  const [debouncedValue, setDebouncedValue] = useState<T>(value);

  useEffect(() => {
    const handler = setTimeout(() => {
      setDebouncedValue(value);
    }, delay);

    return () => {
      clearTimeout(handler);
    };
  }, [value, delay]);

  return debouncedValue;
}

State Management Best Practices​

  1. Minimal State: Keeping state as minimal as possible
  2. Single Source of Truth: Avoiding duplicate state
  3. Derived State: Computing derived state rather than storing it
  4. Immutable Updates: Using immutable patterns for state updates
  5. Selective Persistence: Only persisting necessary state
// Example of derived state
const filteredData = allCryptos.filter(crypto =>
  debouncedSearchTerm === '' || 
  crypto.name.toLowerCase().includes(debouncedSearchTerm.toLowerCase()) ||
  crypto.symbol.toLowerCase().includes(debouncedSearchTerm.toLowerCase())
);

API Integration Best Practices​

  1. Centralized API Clients: Using dedicated modules for API calls
  2. Error Handling: Proper error handling for API requests
  3. Loading States: Showing loading indicators during requests
  4. Data Transformation: Transforming API data close to the source
  5. Caching Strategy: Implementing appropriate caching with React Query

Security Best Practices​

  1. Input Validation: Validating all user inputs with Zod
  2. HTTP-Only Cookies: Using HTTP-only cookies for auth tokens
  3. CSRF Protection: Implementing proper CSRF protection
  4. Environment Variables: Storing secrets in environment variables
  5. SQL Injection Prevention: Using parameterized queries with Drizzle ORM

Performance Best Practices​

  1. Code Splitting: Using dynamic imports for code splitting