Most common TypeScript interview questions

In this article, I will try to include some of the most common TypeScript interview questions with their answers.

1. What is TypeScript?
- TypeScript is an open-source programming language developed by Microsoft that is a superset of JavaScript, adding static typing and other features to enhance the development experience.

2. What is the difference between TypeScript and JavaScript?
- TypeScript is a superset of JavaScript that adds features such as static typing, interfaces, classes, and modules, while JavaScript is a scripting language used to create dynamic and interactive web pages and applications.

3. What is static typing in TypeScript?
- Static typing in TypeScript is the ability to specify variable types at compile time, allowing for improved code quality and error detection.

4. What is an interface in TypeScript?
- An interface in TypeScript is a contract that describes the shape of an object, specifying the names and types of its properties and methods.

5. What is a class in TypeScript?
- A class in TypeScript is a blueprint for creating objects that share common properties and methods, allowing for object-oriented programming.

6. What is the difference between an abstract class and an interface in TypeScript?
- An abstract class in TypeScript is a class that cannot be instantiated but can be extended, while an interface is a contract that describes the shape of an object but does not provide any implementation.

7. What is the purpose of a module in TypeScript?
- A module in TypeScript is a way to organize code and encapsulate functionality, allowing for better code reuse and maintainability.

8. What is the difference between a namespace and a module in TypeScript?
- A namespace in TypeScript is a way to group related code and avoid naming conflicts, while a module is a way to encapsulate functionality and export it for use in other parts of the code.

9. What is the purpose of the readonly keyword in TypeScript?
- The readonly keyword in TypeScript is used to define a property that can only be assigned a value once, preventing accidental changes to the value.

10. What is the purpose of the any type in TypeScript?
- The any type in TypeScript is used to represent a value of any type, allowing for more flexibility but potentially sacrificing type safety.

That’s all, now you have good knowledge about the most common TypeScript questions being asked in interviews.

You can find & contact me on LinkedIn, GitHub, and Facebook, and here is my portfolio for more details about me.