What is constructor function in typescript, what is the needs of using constructor and example of using constructor with required and optional parameters
This tutorial will provide you details on What is object in typescript and how to create object of class in typescript with practical example of creating object from a class and access properties and methods of class.
Learn What is Class in Typescript and how to define and use class in Typescript and why you should always use class to write your Typescript code
Fundamental details on What is Variable Type and How Variable Types Work in TypeScript? and also specifically How to use Type Annotation TypeScript?