TypeScript Essentials

TypeScript adds static typing to JavaScript, catching errors before runtime. Here's how to leverage its power effectively.

Why TypeScript?

Benefits of static typing:

• Catch errors early at compile time
• Better IDE support with autocompletion
• Self-documenting code through types

Core Types

Basic Type Annotations

1. Primitive types (string, number, boolean)
2. Arrays and tuples
3. Objects and interfaces
   • Optional properties
   • Readonly properties
4. Union and intersection types

Copy
1// Example: Type definitions
2interface User {
3  id: number;
4  name: string;
5  email: string;
6  role: "admin" | "user" | "guest";
7  preferences?: {
8    theme: "light" | "dark";
9    notifications: boolean;
10  };
11}
12
13function createUser(data: Omit<User, "id">): User {
14  return { ...data, id: Date.now() };
15}

Advanced Features

"TypeScript is JavaScript that scales."

• TypeScript Team

Best Practices

Write better TypeScript:

• Avoid any - use unknown instead
• Enable strict mode in tsconfig
• Type assertions everywhere Let TypeScript infer

Learn more at TypeScript Handbook.