Complex Types (ประเภทเชิงซ้อน)

Object Types

Interface

interface User {
  id: number;
  name: string;
  email?: string; // Optional
}

const user: User = {
  id: 1,
  name: "John",
};

Type Aliases

type Point = {
  x: number;
  y: number;
};

const center: Point = {
  x: 0,
  y: 0,
};

Function Types

// Function Type Expression
type GreetFunction = (name: string) => string;

const greet: GreetFunction = (name) => `Hello, ${name}!`;

// Call Signatures
interface SearchFunc {
  (source: string, subString: string): boolean;
}

Class Types

class Person {
  name: string;
  age: number;

  constructor(name: string, age: number) {
    this.name = name;
    this.age = age;
  }

  greet(): string {
    return `Hello, my name is ${this.name}`;
  }
}

const person = new Person("John", 30);