Angular Q&A: How do Type Definitions with Interfaces work?

In Angular, you can use interfaces to define the structure of objects and classes. This can be useful for defining the shape of data that your components will work with, and for ensuring that the data has the correct properties and values.

To use interfaces in Angular, you can create an interface using the interface keyword, and then define the properties and their types. For example, here is how you might define an IProduct interface that describes the structure of a product object:

interface IProduct {
  id: number;
  name: string;
  price: number;
  description: string;
}

Once you have defined an interface, you can use it to type-check the properties of an object or class. For example, you could use the IProduct interface to ensure that a Product class has the correct properties and types:

class Product implements IProduct {
  id: number;
  name: string;
  price: number;
  description: string;
}

If you try to assign a value to a property that does not exist in the interface, or if you try to assign a value of the wrong type, TypeScript will throw an error. This can help you catch mistakes early on and ensure that your code is correct and consistent.

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