What are optional properties in TypeScript?

Can you explain what optional properties are in TypeScript?

Sure! Optional properties in TypeScript are properties that may or may not be present in an object. They are defined using a question mark (?) after the property name.

Can you give me an example of how to use optional properties?

Of course! Here's an example:

interface User {
  name: string;
  age?: number; // age is optional
}

const user1: User = { name: 'Alice' };
const user2: User = { name: 'Bob', age: 30 };

In this example, the age property is optional.

What happens if I try to access an optional property that doesn't exist?

If you try to access an optional property that doesn't exist, TypeScript will not throw an error, but the value will be undefined. You can check for its existence before using it.