What are interfaces in TypeScript? How do they differ from types?

Answer

Interfaces in TypeScript define the structure of an object. They can extend other interfaces and provide a way to enforce contracts in your code.

interface User {
  name: string;
  age: number;
  isAdmin?: boolean; // Optional property
}

const user: User = { name: "Alice", age: 30 };

Difference:

Interfaces are extendable through extends, while types use intersection (&) to combine types.
Interfaces are primarily used for object shapes, whereas type is more versatile (can define union, tuple, or primitive types).