What is the difference between interfaces and types in JavaScript?

What is the difference between interfaces and types in JavaScript?

In JavaScript, 'types' are used to define the shape of data, while 'interfaces' are a TypeScript feature that defines contracts for classes.

Can you give me an example of how to use an interface?

Sure! Here's a simple example:

interface User {
  name: string;
  age: number;
}

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

How do types differ from interfaces in terms of usage?

Types can represent primitive types, unions, and intersections, while interfaces are primarily used for object shapes and can be extended.

When should I use an interface instead of a type?

Use interfaces when you want to define a contract for classes or when you need to extend existing types. Use types for more complex type definitions.