Why You Should Use This Typescript Online Assessment Test

The TypeScript Online Assessment Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. The test screens candidates for the typical skills recruiters look for in a TypeScript developer: Types and how to use them Understanding how the TypeScript compiler works ES6 features (Ex: Creating and using arrow functions) Classes, objects, inheritance and encapsulation Namespaces and modules Use Interfaces to define a contract for objects, functions and arrays Generics, Closures and Decorators Asynchronous programming Creating functions that take optional, default and variable number of arguments Analyzing errors and handling exceptions Using Typescript with Webpack to run it inside the browser Creating Dynamic views Along with TypeScript, code-tracing MCQ questions are used to evaluate JavaScript fundamentals and coding questions to evaluate hands-on JavaScript programming skills.

TypeScript Online Test

About the test:

The TypeScript test uses scenario-based MCQ questions and code-tracing questions to evaluate a candidate's understanding of Typescript concepts like Types, ES6 Support, OOP (Classes, Modules, Interfaces) and their ability to write asynchronous code with async/await. Along with TypeScript, the test has MCQ questions to evaluate JavaScript fundamentals and coding questions to evaluate hands-on coding skills.

Covered skills:

JavaScript fundamentals
Typescript basics (Types; ES6)
Reusing Objects through Inheritance
Encapsulating classes/objects
Usage of TypeScript with webpack

Understanding of DOM and web scripting
Creating objects using classes
Using different access modifiers
Asynchronous development with Async/Await
Exception handling

See all covered skills

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9 reasons why

Adaface TypeScript Online Test is the most accurate way to shortlist Full Stack (Typescript) Engineers

Reason #1

Tests for on-the-job skills

The TypeScript Online Assessment Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. The test screens candidates for the typical skills recruiters look for in a TypeScript developer:

Types and how to use them
Understanding how the TypeScript compiler works
ES6 features (Ex: Creating and using arrow functions)
Classes, objects, inheritance and encapsulation
Namespaces and modules
Use Interfaces to define a contract for objects, functions and arrays
Generics, Closures and Decorators
Asynchronous programming
Creating functions that take optional, default and variable number of arguments
Analyzing errors and handling exceptions
Using Typescript with Webpack to run it inside the browser
Creating Dynamic views

Along with TypeScript, code-tracing MCQ questions are used to evaluate JavaScript fundamentals and coding questions to evaluate hands-on JavaScript programming skills.

Reason #2

No trick questions

Traditional assessment tools use trick questions and puzzles for the screening, which creates a lot of frustration among candidates about having to go through irrelevant screening assessments.

The main reason we started Adaface is that traditional pre-employment assessment platforms are not a fair way for companies to evaluate candidates. At Adaface, our mission is to help companies find great candidates by assessing on-the-job skills required for a role.

Why we started Adaface ->

Reason #3

Non-googleable questions

We have a very high focus on the quality of questions that test for on-the-job skills. Every question is non-googleable and we have a very high bar for the level of subject matter experts we onboard to create these questions. We have crawlers to check if any of the questions are leaked online. If/ when a question gets leaked, we get an alert. We change the question for you & let you know.

These are just a small sample from our library of 10,000+ questions. The actual questions on this TypeScript Online Test will be non-googleable.

🧐 Question
Medium Alias OOPs	Solve
What does the following TypeScript code print?
Medium Truthiness Narrowing	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
Medium Types	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
Medium Async Await Promises Promises Async-Await	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
Easy Bitcoin prices Axios Promises	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
Medium My Module Scope	Solve
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await	Solve
What does the following code output?
Easy Throw, Try, Async Promises Async-Await	Solve
What does the following JS code output?
Easy Registration Queue Logic Queues	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
Medium Visitors Count Strings Logic	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill
	Medium Alias OOPs	2 mins TypeScript	Solve
What does the following TypeScript code print?
	Medium Truthiness Narrowing	3 mins TypeScript	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
	Medium Types	2 mins TypeScript	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
	Medium Async Await Promises Promises Async-Await	2 mins JavaScript	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Easy Bitcoin prices Axios Promises	2 mins JavaScript	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	Medium My Module Scope	2 mins JavaScript	Solve
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await	2 mins JavaScript	Solve
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await	2 mins JavaScript	Solve
What does the following JS code output?
	Easy Registration Queue Logic Queues	30 mins Coding	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Medium Visitors Count Strings Logic	30 mins Coding	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Alias OOPs	TypeScript	Medium	2 mins	Solve
What does the following TypeScript code print?
	Truthiness Narrowing	TypeScript	Medium	3 mins	Solve
We wrote the following TypeScript function to work as global print function. The function needs to handle string input, an array of strings as input or null as an input. In case of string and array of strings, it needs to print them to console. For null input, the code should not print anything. The function is throwing an error when it is called with null - globalConsole(null). This is happening because typeof null is ‘object’ in JavaScript. Here are two modifications of the code to handle this case: Pick the correct statements: A: In the case of null input, globalConsole1 won’t produce any compiler errors like globalConsole B: In the case of null input, globalConsole2 won’t produce any compiler errors like globalConsole C: globalConsole1 will differ from globalConsole for an empty string D: globalConsole2 will differ from globalConsole for an empty string
	Types	TypeScript	Medium	2 mins	Solve
Consider the following TypeScript code: Which of the following statements are correct: A: The typescript compiler confirms that toUpperCase exists on the a instance. B: The typescript compiler states that the toUpperCase function does not exist on the b instance. C: The typescript compiler confirms that the toUpperCase function exists on the b instance. D: RectangleType is an array where the type of a fixed number of elements is known. E: Variables r, g, b are immutable. F: r, g, b would compile to same type signature
	Async Await Promises Promises Async-Await	JavaScript	Medium	2 mins	Solve
What will the following code output? A: 24 after 5 seconds and after another 5 seconds, another 24 B: 24 followed by another 24 immediately C: 24 immediately and another 24 after 5 seconds D: After 5 seconds, 24 and 24 E: Undefined F: NaN G: None of these
	Bitcoin prices Axios Promises	JavaScript	Easy	2 mins	Solve
Review the following JavaScript code and pick the correct options: Assume that the API returns a successful 200 response code and a JSON object as the response body. What would the value of ‘a’ be after the code is executed?
	My Module Scope	JavaScript	Medium	2 mins	Solve
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await	JavaScript	Medium	2 mins	Solve
What does the following code output?
	Throw, Try, Async Promises Async-Await	JavaScript	Easy	2 mins	Solve
What does the following JS code output?
	Registration Queue Logic Queues	Coding	Easy	30 mins	Solve
We want to register students for the next semester. All students have a receipt which shows the amount pending for the previous semester. A positive amount (or zero) represents that the student has paid extra fees, and a negative amount represents that they have pending fees to be paid. The students are in a queue for the registration. We want to arrange the students in a way such that the students who have a positive amount on the receipt get registered first as compared to the students who have a negative amount. We are given a queue in the form of an array containing the pending amount. For example, if the initial queue is [20, 70, -40, 30, -10], then the final queue will be [20, 70, 30, -40, -10]. Note that the sequence of students should not be changed while arranging them unless required to meet the condition. ⚠️⚠️⚠️ Note: - The first line of the input is the length of the array. The second line contains all the elements of the array. - The input is already parsed into an array of "strings" and passed to a function. You will need to convert string to integer/number type inside the function. - You need to "print" the final result (not return it) to pass the test cases. For the example discussed above, the input will be: 5 20 70 -40 30 -10 Your code needs to print the following to the standard output: 20 70 30 -40 -10
	Visitors Count Strings Logic	Coding	Medium	30 mins	Solve
A manager hires a staff member to keep a record of the number of men, women, and children visiting the museum daily. The staff will note W if any women visit, M for men, and C for children. You need to write code that takes the string that represents the visits and prints the count of men, woman and children. The sequencing should be in decreasing order. Example: Input: WWMMWWCCC Expected Output: 4W3C2M Explanation: ‘W’ has the highest count, then ‘C’, then ‘M’. ⚠️⚠️⚠️ Note: - The input is already parsed and passed to a function. - You need to "print" the final result (not return it) to pass the test cases. - If the input is- “MMW”, then the expected output is "2M1W" since there is no ‘C’. - If any of them have the same count, the output should follow this order - M, W, C.

Reason #4

1200+ customers in 75 countries

With Adaface, we were able to optimise our initial screening process by upwards of 75%, freeing up precious time for both hiring managers and our talent acquisition team alike!

Brandon Lee, Head of People, Love, Bonito

Reason #5

Designed for elimination, not selection

The most important thing while implementing the pre-employment TypeScript Online Test in your hiring process is that it is an elimination tool, not a selection tool. In other words: you want to use the test to eliminate the candidates who do poorly on the test, not to select the candidates who come out at the top. While they are super valuable, pre-employment tests do not paint the entire picture of a candidate’s abilities, knowledge, and motivations. Multiple easy questions are more predictive of a candidate's ability than fewer hard questions. Harder questions are often "trick" based questions, which do not provide any meaningful signal about the candidate's skillset.

Reason #6

1 click candidate invites

Email invites: You can send candidates an email invite to the TypeScript Online Test from your dashboard by entering their email address.

Public link: You can create a public link for each test that you can share with candidates.

API or integrations: You can invite candidates directly from your ATS by using our pre-built integrations with popular ATS systems or building a custom integration with your in-house ATS.

Reason #7

Detailed scorecards & benchmarks

Reason #8

High completion rate

Adaface tests are conversational, low-stress, and take just 25-40 mins to complete.

This is why Adaface has the highest test-completion rate (86%), which is more than 2x better than traditional assessments.

Reason #9

Advanced Proctoring

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How is the test customized for Senior TypeScript Developers?

The questions will test advanced topics for tests aimed at senior developers. Here are some topics that we use to create advanced Kotlin questions:

How to convert Java code into Kotlin
Understand how Java and Kotlin programs interoperate
Advanced OOP (Interface Classes, Abstract Classes, Generic Classes, Enums in Kotlin)
Advanced collections (MapOf, Arrayof, MutableList)
Asynchronous programming techniques (Threading, Callbacks, Futures, promises etc)
Reactive extensions and Coroutines

What roles can I use the TypeScript Online Test for?

Full Stack (Typescript) Engineer
Backend Engineer Typescript
Frontend Software Developer (TypeScript)
Web Developer (TypeScript)
Node JS + TypeScript Developer
Senior TypeScript Developer
Senior Software Engineer (TypeScript)

What topics are covered in the TypeScript Online Test?

Types

Arrays

Tuples

Enums

TypeScript compiler

ES6 features

Arrow functions

Webpack

Dynamic views

Object-oriented programming (OOP)

Classes, methods and properties

Namespaces

Modules

Interfaces

Generics

Decorators

Closures

Access modifiers

Asynchronous programming

Async/Await

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The hiring managers felt that through the technical questions that they asked during the panel interviews, they were able to tell which candidates had better scores, and differentiated with those who did not score as well. They are highly satisfied with the quality of candidates shortlisted with the Adaface screening.

85%

reduction in screening time

View Full Case Study

Typescript Online Test FAQs

Can I evaluate JavaScript and TypeScript in the same test?

Yes. We support testing multiple skills in the same test. You can review our standard JavaScript test to get a sense of what kind of questions will be included to test JavaScript alone. The final test will include MCQ questions to evaluate TypeScript, JavaScript and coding questions to evaluate JavaScript.

Can I evaluate React and TypeScript in the same test?

Yes. We support testing multiple skills in the same test. You can review our standard React test to get a sense of what kind of questions will be included to test React skills. The final test will include MCQ questions to evaluate React, TypeScript, HTML/ CSS and coding questions.

Can I evaluate VueJS with TypeScript in the same test?

Yes. We support testing multiple skills in the same test. You can review our standard Vue JS test to get a sense of what kind of questions will be included to test Vue skills. The final test will include MCQ questions to evaluate Vue, TypeScript, HTML/ CSS and coding questions.

Can I evaluate Angular with TypeScript in the same test?

Yes. We support testing multiple skills in the same test. You can review our standard Angular test to get a sense of what kind of questions will be included to test Angular skills. The final test will include MCQ questions to evaluate Angular, TypeScript, HTML/ CSS and coding questions.

How is the test customized for Backend NodeJS TypeScript Developers?

The test will include scenario-based MCQ questions to evaluate Node JS, TypeScript, REST skills and coding questions. You can check our standard NodeJS test to understand how we design NodeJS questions.

Can I combine multiple skills into one custom assessment?

Yes, absolutely. Custom assessments are set up based on your job description, and will include questions on all must-have skills you specify.

Do you have any anti-cheating or proctoring features in place?

We have the following anti-cheating features in place:

Non-googleable questions
IP proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser

Read more about the proctoring features.

How do I interpret test scores?

The primary thing to keep in mind is that an assessment is an elimination tool, not a selection tool. A skills assessment is optimized to help you eliminate candidates who are not technically qualified for the role, it is not optimized to help you find the best candidate for the role. So the ideal way to use an assessment is to decide a threshold score (typically 55%, we help you benchmark) and invite all candidates who score above the threshold for the next rounds of interview.

What experience level can I use this test for?

Each Adaface assessment is customized to your job description/ ideal candidate persona (our subject matter experts will pick the right questions for your assessment from our library of 10000+ questions). This assessment can be customized for any experience level.

Does every candidate get the same questions?

Yes, it makes it much easier for you to compare candidates. Options for MCQ questions and the order of questions are randomized. We have anti-cheating/ proctoring features in place. In our enterprise plan, we also have the option to create multiple versions of the same assessment with questions of similar difficulty levels.