How do I use types in TypeScript?

How do I use types in TypeScript?

In TypeScript, you can use types to define the shape of your data. For example, you can use basic types like string, number, and boolean, or create custom types using interfaces or type aliases.

Can you give me an example of using an interface?

Sure! Here's a simple example:

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

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

What about union types?

Union types allow a variable to hold multiple types. For example:

let id: string | number;
id = '123'; // valid
id = 123; // also valid

How do I use generics in TypeScript?

Generics allow you to create reusable components. For example:

function identity<T>(arg: T): T {
  return arg;
}

const result = identity<string>('Hello');