How do I define required properties in TypeScript?

How do I define required properties in TypeScript?

In TypeScript, you can define required properties in an interface or a type by simply declaring them without a question mark. For example:

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

In this case, both name and age are required properties.

What happens if I don't provide a required property?

If you don't provide a required property when creating an object of that type, TypeScript will throw a compilation error. This helps ensure that all necessary data is provided.

Can I make some properties optional?

Yes! You can make properties optional by adding a question mark after the property name. For example:

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

Here, age is optional.

How do I define default values for properties?

TypeScript itself doesn't support default values directly in types or interfaces. However, you can set default values when you create an object or in a class constructor.