Classes in TypeScript

We have already overviewed the most relevant bits and pieces of TypeScript, and now it’s time to see how everything falls into place with TypeScript classes. Classes are a fundamental concept in Angular development because everything in the Angular world is a TypeScript class.

Although the class is a reserved keyword in JavaScript, the language itself never had an actual implementation as in other languages such as Java or C#. JavaScript developers used to mimic this kind of functionality by leveraging the function object as a constructor type and instantiating it with the new operator. Other standard practices, such as extending function objects, were implemented by applying prototypal inheritance or using composition.