Javascript

Modern JavaScript Async Patterns

August 2024

Modern JavaScript Async Patterns

Exploring the evolution from callbacks to async/await and beyond.

Promise Chains vs Async/Await

// Promise chains
fetchUser(id)
  .then(user => fetchPosts(user.id))
  .then(posts => renderPosts(posts))
  .catch(handleError);

// Async/await
try {
  const user = await fetchUser(id);
  const posts = await fetchPosts(user.id);
  renderPosts(posts);
} catch (error) {
  handleError(error);
}

The async/await syntax makes asynchronous code much more readable!

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TypeScript Best Practices 2024

July 2024

TypeScript Best Practices 2024

Essential TypeScript patterns and practices for better code quality.

Type Definitions

// Use interfaces for object shapes
interface User {
  id: string;
  name: string;
  email: string;
  createdAt: Date;
}

// Use type aliases for unions
type Status = 'loading' | 'success' | 'error';

// Generic constraints
interface Repository<T extends { id: string }> {
  findById(id: string): Promise<T>;
  save(entity: T): Promise<T>;
}

Utility Types

// Partial for updates
function updateUser(id: string, updates: Partial<User>) {
  // Implementation
}

// Pick for specific fields
type UserSummary = Pick<User, 'id' | 'name'>;

// Omit for exclusions
type CreateUser = Omit<User, 'id' | 'createdAt'>;

Best Practices

  1. Enable strict mode
  2. Use unknown instead of any
  3. Prefer type assertions over type casting
  4. Use const assertions for immutable data

TypeScript makes JavaScript development so much safer!

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