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TypeScript Interview Questions - Coding Interview 2025

Oleksandr Kocherhin

This course is great preparation for any TypeScript programming interviews that you may have coming up. Programming interviews need a lot amount of knowledge, but the best way to prepare for interviews is a lot of practice. In this course you will complete 44 TypeScript interview questions that come from real TypeScript interviews. There are no excersises that nobody asks here. In every question we will get a task first, then you will try to solve each problem yourself, and then I will show you different solutions to each problem step-by-step for different programmer levels. We will take a deep dive into the skills, concepts, and techniques that are required to solve each problem.

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This course is great preparation for any TypeScript programming interviews that you may have coming up. Programming interviews need a lot amount of knowledge, but the best way to prepare for interviews is a lot of practice. In this course you will complete 44 TypeScript interview questions that come from real TypeScript interviews. There are no excersises that nobody asks here. In every question we will get a task first, then you will try to solve each problem yourself, and then I will show you different solutions to each problem step-by-step for different programmer levels. We will take a deep dive into the skills, concepts, and techniques that are required to solve each problem.

When you have completed this course you will have mastered the 44 interview questions that we will cover, but you will also have learned the concepts, skills, and techniques, that are necessary for you to excel in any other interview questions you may be asked. You will feel very confident going into any TypeScript programming interviews you will have. On top of all this, you will strengthen your TypeScript programming skills and TypeScript fundamentals in overall.

Core topics of the course:

  • Types & Interfaces

  • Generics

  • Working with classes

  • Working with DOM

  • Tuples

  • Enums

  • React with Typescript

  • Extends & Infer

  • Void, Any, Unknown, Never  data types

  • Readonly, Pick, Omit, Partial, Required data type helpers

Enroll now

What's inside

Learning objectives

  • Be very well prepared for any typescript programming interviews you will have
  • Excel in a wide variety of typescript interview questions that you could be asked in an interview
  • Strengthen you typescript programming skills and your knowledge of important typescript concepts
  • Learn the skills, concepts, and techniques necessary to excel in typescript coding interviews
  • Learn what programming interviews are like and what kind of questions to expect
  • Feel very confident going into any typescript programming interviews you will have

Syllabus

Introduction
What is this section about?
Setting up Typescript
Javascript vs Typescript
Read more
Does Typescript improve our code out of the box?
Pdf file
I prepared source code for you
Core Typescript
How to define basic types inside Typescript?
What is the difference between explicit vs implicit types?
Type a function getFullName correctly
What is interface in Typescript?
What is type in Typescript?
What is the difference between an interface and a type?
What is union in Typescript?
How to narrow the union in Typescript?
What is void in Typescript?
What is never in Typescript?
What is any in Typescript?
What is unknown in Typescript?
How to work with DOM in Typescript?
How to work with classes in Typescript?
What is an enum in Typescript?
What are generics in Typescript?
What is a tuple in Typescript?
What is optional property in Typescript?
How to cover dynamic keys in the object?
What is index signature in Typescript?
What is a record type in Typescript?
What is omit and pick in Typescript?
What is readonly in Typescript?
What is partial in Typescript?
What is required in Typescript?
How to use Typescript together with React?
What is type inference in Typescript?
What is literal type in Typescript?
What is tsconfig.json file?
What are the core components of Typescript?
How to transpile Typescript to Javascript?
What is d.ts file in Typescript?
What is map file in Typescript?
Advanced Typescript
Introduction for advanced section
What is function overloading in Typescript?
What is extends in Typescript?
What is infer in Typescript?
Do it yourself - readonly
Do it yourself - first
Do it yourself - tuple length
Do it yourself - if
Do it yourself - concat
What's next?
Homework
My Bonus Lecture

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Covers React with Typescript, which is highly relevant for front-end developers seeking roles in modern web development
Strengthens Typescript fundamentals, which are essential for solving complex problems and designing robust applications
Explores advanced Typescript features like 'extends' and 'infer', which are useful for writing more expressive and maintainable code
Includes hands-on exercises where learners implement type helpers like Readonly, which reinforces understanding through practical application
Requires learners to set up Typescript, which may pose a challenge for those unfamiliar with the configuration and tooling
Includes a section on tsconfig.json, which is essential for configuring Typescript projects and managing compilation options

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in TypeScript Interview Questions - Coding Interview 2025 with these activities:
Review Core JavaScript Concepts
Reinforce your understanding of JavaScript fundamentals, as TypeScript builds upon these concepts.
Browse courses on JavaScript Fundamentals
Show steps
  • Review data types and operators.
  • Practice working with functions and objects.
  • Familiarize yourself with ES6+ features.
Programming TypeScript
Use a book to get a solid foundation in TypeScript programming.
View Programming TypeScript on Amazon
Show steps
  • Read the introductory chapters.
  • Work through the examples in the book.
  • Try the exercises at the end of each chapter.
LeetCode TypeScript Problems
Sharpen your problem-solving skills by tackling TypeScript-specific challenges on platforms like LeetCode.
Show steps
  • Identify TypeScript problems on LeetCode.
  • Attempt to solve each problem independently.
  • Compare your solutions with others.
Four other activities
Expand to see all activities and additional details
Show all seven activities
Effective TypeScript: 62 Specific Ways to Improve Your TypeScript
Supplement your learning with a comprehensive guide to TypeScript best practices.
View Effective Typescript on Amazon
Show steps
  • Read a chapter on a specific TypeScript topic.
  • Implement the techniques discussed in the chapter.
  • Refactor existing code using the new techniques.
Build a Simple React App with TypeScript
Gain practical experience by building a small React application using TypeScript, solidifying your understanding of both technologies.
Show steps
  • Set up a React project with TypeScript.
  • Implement components with type annotations.
  • Manage state using TypeScript interfaces.
  • Test and debug your application.
Write a Blog Post on a TypeScript Concept
Deepen your understanding by explaining a TypeScript concept in your own words through a blog post.
Show steps
  • Choose a TypeScript concept to explain.
  • Research the concept thoroughly.
  • Write a clear and concise explanation.
  • Include code examples to illustrate the concept.
Contribute to a TypeScript Open Source Project
Apply your TypeScript skills in a real-world setting by contributing to an open-source project.
Show steps
  • Find a TypeScript project on GitHub.
  • Identify an issue to work on.
  • Submit a pull request with your changes.

Career center

Learners who complete TypeScript Interview Questions - Coding Interview 2025 will develop knowledge and skills that may be useful to these careers:
Web Application Developer
Web application developers build and maintain web applications, and this course is very helpful for the role. This course provides a strong foundation in TypeScript, which may be used in the role.The course's 44 real interview questions provide the type of practice that will help a web application developer. This course will help a web application developer better understand the core technologies behind their work. A web application developer should definitely take this course.
See salaries and explore the career path for Web Application Developer
Frontend Developer
A frontend developer is responsible for building the user interface of websites and web applications, and TypeScript is frequently used tool in the role. This course covers key TypeScript topics such as types, generics, classes and working with the DOM which helps build a foundation for the role. The coding practice provided by the 44 interview questions increases the preparedness of a frontend developer by familiarizing them with common challenges they'll face in a job search. Specifically, the course's module on React with TypeScript will help a frontend developer in this role. This course is a very direct way to gain experience with the challenges of the role.
See salaries and explore the career path for Frontend Developer
Software Engineer
A software engineer develops and maintains software applications, and this course will directly help with the TypeScript aspects of this role. This course provides practice with 44 real interview questions, helping to build the skills that a software engineer may need for a job search. The course delves into core TypeScript concepts. This practical approach to learning TypeScript strengthens the foundation of a software engineer's programming know-how, making this course useful for someone who wants to move into the field.
See salaries and explore the career path for Software Engineer
Software Development Engineer
A software development engineer designs, develops, and tests software systems, and this course provides a focused approach to learning TypeScript. The 44 real-world interview questions in this course builds the practical skills required for this work. The course covers essential TypeScript concepts like generics, interfaces, and working with classes. This course provides a valuable approach to mastering TypeScript for a software development engineer. This course will be very useful for someone who wants to enter this field.
See salaries and explore the career path for Software Development Engineer
Application Developer
An application developer designs, develops, and implements software applications, and a deep understanding of TypeScript will be useful in this field. This course provides a good approach to mastering the essential concepts and techniques of TypeScript. The course's use of real interview questions provides very valuable practice. The course covers many core topics such as classes, enums, and generics. An application developer will benefit from the breadth this course offers.
See salaries and explore the career path for Application Developer
Full-Stack Developer
A full stack developer works on both the front and back end of applications, and this course's focus on TypeScript is a necessary tool. The course offers a wide variety of practice with core TypeScript concepts to help a full stack developer. The interview questions provide a very useful approach in building familiarity with challenges a developer may face. The course provides practice with working with React and TypeScript. A full stack developer who takes this course will develop a broader set of skills by working through the material.
See salaries and explore the career path for Full-Stack Developer
Web Developer
A web developer creates and maintains websites, and a strong understanding of TypeScript can be a very useful tool in this role. With 44 real interview questions, this course provides necessary practice for a web developer to build their skills. This course covers fundamentals such as types, interfaces, and generics, all of which are useful for a web developer. For someone looking to enter the field of web development, this course introduces them to the skills they may need.
See salaries and explore the career path for Web Developer
UI Developer
A user interface developer specializes in creating the visual and interactive elements of an application, and this course can be helpful for this role. The 44 interview questions in this course provide a hands-on approach to learning TypeScript. The course covers core concepts such as working with classes, DOM, and React with TypeScript. A UI developer who takes this course will have a better understanding of the technical challenges involved in the role. The hands on approach to learning TypeScript will be particularly helpful.
See salaries and explore the career path for UI Developer
Mobile Developer
A mobile developer creates applications for mobile devices, and this course can add a useful tool to their skill set. This course practices TypeScript questions that come from real interviews. The course covers many fundamentals such as types, interfaces, and how to work with the DOM. With experience working with TypeScript, the mobile developer will have an additional skillset they can use. The React with Typescript module will be particularly valuable.
See salaries and explore the career path for Mobile Developer
Technical Lead
A technical lead manages a team of developers, and this course may be useful in this role, especially if the team uses TypeScript. While this role focuses on leadership, having a strong foundation in TypeScript will assist a technical lead. The course's 44 real interview questions reinforces the technical know-how needed for a technical lead. For a technical lead the knowledge of Typescript will assist them in coaching other developers. The course's coverage of topics such as classes, generics and React with Typescript will be useful.
See salaries and explore the career path for Technical Lead
Solutions Architect
A solutions architect designs and oversees the implementation of complex systems, and this course may be useful to this role. While this role is more focused on design, it is important to have a familiarity with the various tools that the team uses. This course provides practice with TypeScript. The 44 interview questions and the topics covered in the course will be useful for a solutions architect. Particularly useful will be the course's coverage of core topics such as classes, enums, and generics.
See salaries and explore the career path for Solutions Architect
Game Developer
Game developers create video games, and knowledge of TypeScript may be helpful in this role. The course helps build a foundation in TypeScript, an important tool used in some game development stacks. This course provides practice with 44 real interview questions in the field. The course covers key topics such as generics, classes, and working with the DOM. This course will help a game developer be more well versed in some of the technologies used in the field of web development which is increasingly merging with game development.
See salaries and explore the career path for Game Developer
Data Engineer
A data engineer builds and maintains systems that process large datasets, and this course may be useful to this role. The course provides practice with TypeScript, and covers fundamentals such as types, interfaces, and working with classes. A data engineer will often interact with APIs and web services, so this course may add to their skill set. The hands on approach to learning through interview questions will supplement the typical education of a data engineer.
See salaries and explore the career path for Data Engineer
DevOps Engineer
A DevOps engineer manages software releases and infrastructure, and while this role does not directly involve programming, this course may be helpful. This course provides practice with TypeScript, and covers such core concepts as interfaces, generics, and classes. A DevOps engineer may need familiarity with the type of coding that their team undertakes. Through the interview questions, the DevOps engineer will gain a better understanding of the coding challenges their team might face. This course will be useful to a DevOps engineer hoping to understand their team's coding process.
See salaries and explore the career path for DevOps Engineer
Embedded Systems Engineer
An embedded systems engineer works with computer systems within other devices, and this course may be helpful for this role. The course focuses on TypeScript concepts and techniques such as types, enums, and generics. Although this role is not primarily focused on web technologies, the skills learned in the course may be helpful to an embedded systems engineer. The hands on approach to learning through interview questions will supplement the typical education of an embedded systems engineer.
See salaries and explore the career path for Embedded Systems Engineer

Reading list

We've selected two books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in TypeScript Interview Questions - Coding Interview 2025.
Cover image
Effective Typescript
Save
Provides practical advice and best practices for writing high-quality TypeScript code. It covers a wide range of topics, from basic type annotations to advanced techniques like generics and conditional types. This book valuable resource for anyone looking to improve their TypeScript skills and write more maintainable code. It expands on the course material by providing concrete examples and in-depth explanations.
Effective Typescript
Paperback
Check
Effective Typescript
Kindle Edition
Check
Cover image
Programming TypeScript
Save
Offers a comprehensive introduction to TypeScript, covering everything from basic syntax to advanced features. It's a great resource for developers who are new to TypeScript or who want to deepen their understanding of the language. The book is well-written and easy to follow, with plenty of examples and exercises. It provides a solid foundation for the course and can be used as a reference throughout your learning journey.
Programming TypeScript
Paperback
Check
Programming TypeScript
Kindle Edition
Check

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Effort
3 total hours
Via
Udemy
Instructor
Oleksandr Kocherhin
Language
English
Good to know
Covers React with Typescript, which is highly relevant for front-end developers seeking roles in modern web development
Strengthens Typescript fundamentals, which are essential for solving complex problems and designing robust applications
Explores advanced Typescript features like 'extends' and 'infer', which are useful for writing more expressive and maintainable code
Includes hands-on exercises where learners implement type helpers like Readonly, which reinforces understanding through practical application
Requires learners to set up Typescript, which may pose a challenge for those unfamiliar with the configuration and tooling
Includes a section on tsconfig.json, which is essential for configuring Typescript projects and managing compilation options
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