Why you should use TypeScript Online Test?

The TypeScript Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects: Understanding JavaScript fundamentals Working with the DOM and web scripting Applying TypeScript basics, including types and features of ES6 Creating objects using classes Reusing objects through inheritance Applying different access modifiers to control class/object behavior Encapsulating classes/objects for better code organization Developing asynchronously using async/await Using TypeScript with webpack for module bundling Handling exceptions and errors

TypeScript Online Test

Q: What topics are covered in the TypeScript Online Test?

JavaScript fundamentals Understanding of DOM and web scripting Typescript basics (Types; ES6) Creating objects using classes Reusing Objects through Inheritance Using different access modifiers Encapsulating classes/objects Asynchronous development with Async/Await Usage of TypeScript with webpack Exception handling

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

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9 reasons why

Adaface TypeScript Test is the most accurate way to shortlist Web Developers

Reason #1

Tests for on-the-job skills

The TypeScript Online Test helps recruiters and hiring managers identify qualified candidates from a pool of resumes, and helps in taking objective hiring decisions. It reduces the administrative overhead of interviewing too many candidates and saves time by filtering out unqualified candidates at the first step of the hiring process.

The test screens for the following skills that hiring managers look for in candidates:

Understanding and usage of basic JavaScript syntax and functions
Knowledge of the DOM and ability to manipulate web elements
Typescript fundamentals, including understanding types and ES6 features
Creation of objects using classes
Understanding and implementation of inheritance
Ability to use different access modifiers
Knowledge of encapsulation of classes and objects
Proficiency in asynchronous development with Async/Await
Experience using TypeScript with webpack
Efficient handling of exceptions and errors

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.

View sample questions

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

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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.

How we design questions

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
Hard 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
Medium 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
	Hard 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
	Medium 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	Hard	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	Medium	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

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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.

Science behind Adaface tests

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

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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

Learn more

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About the TypeScript Assessment Test

Why you should use Pre-employment TypeScript Online Test?

The TypeScript Online Test makes use of scenario-based questions to test for on-the-job skills as opposed to theoretical knowledge, ensuring that candidates who do well on this screening test have the relavant skills. The questions are designed to covered following on-the-job aspects:

Understanding JavaScript fundamentals
Working with the DOM and web scripting
Applying TypeScript basics, including types and features of ES6
Creating objects using classes
Reusing objects through inheritance
Applying different access modifiers to control class/object behavior
Encapsulating classes/objects for better code organization
Developing asynchronously using async/await
Using TypeScript with webpack for module bundling
Handling exceptions and errors

Once the test is sent to a candidate, the candidate receives a link in email to take the test. For each candidate, you will receive a detailed report with skills breakdown and benchmarks to shortlist the top candidates from your pool.

What topics are covered in the TypeScript Online Test?

JavaScript fundamentals
JavaScript fundamentals refer to the core concepts and principles of the JavaScript programming language. This includes understanding variables, data types, control flow, loops, functions, and more. Assessing this skill is important as it forms the foundation for working with TypeScript and building web applications.
Understanding of DOM and web scripting
An understanding of the Document Object Model (DOM) and web scripting involves knowing how to manipulate HTML elements and interact with web pages dynamically using JavaScript. This is crucial for developing interactive and responsive web applications. Testing this skill helps evaluate the candidate's ability to work with the DOM and perform web scripting tasks.
Typescript basics (Types; ES6)
Typescript basics cover important concepts such as type annotations, type inference, and the use of ES6 features. Assessing this skill ensures that candidates have a solid understanding of TypeScript syntax and can leverage its features to write type-safe and modern JavaScript code.
Creating objects using classes
Creating objects using classes is an essential skill as it allows for code organization and the creation of reusable, structured objects in TypeScript. Evaluating this skill helps determine the candidate's proficiency in using classes to define and instantiate objects, enabling better code maintainability and extensibility.
Reusing Objects through Inheritance
Reusing objects through inheritance is a key aspect of object-oriented programming in TypeScript. This skill involves understanding how to derive new classes from existing ones and inherit their properties and methods. Testing this skill ensures that candidates can effectively utilize inheritance to achieve code reuse and promote modular design.
Using different access modifiers
Using different access modifiers, such as public, private, and protected, allows for controlling the visibility and access of class members. Assessing this skill helps evaluate the candidate's ability to implement encapsulation and enforce proper data hiding and abstraction in TypeScript code.
Encapsulating classes/objects
Encapsulating classes/objects involves the practice of bundling data and methods within a class, providing a level of encapsulation and protecting the internals from external interference. This skill evaluation ensures candidates can effectively encapsulate and create well-organized, modular code in TypeScript.
Asynchronous development with Async/Await
Asynchronous development with Async/Await involves writing code that can handle asynchronous operations and manage promises in a more readable and maintainable manner. Testing this skill helps assess the candidate's ability to write asynchronous code using Async/Await syntax, allowing for better handling of operations like API calls, file reading/writing, and more.
Usage of TypeScript with webpack
Usage of TypeScript with webpack refers to the ability to integrate TypeScript into a webpack-based development workflow. This includes setting up TypeScript configuration, managing module bundling, and leveraging webpack features like code splitting and dynamic imports. Evaluating this skill verifies the candidate's proficiency in using TypeScript with webpack for optimized and efficient development.
Exception handling
Exception handling is the practice of catching and handling errors or exceptions that occur during the execution of a program. Assessing this skill helps determine the candidate's ability to handle errors gracefully and implement proper error handling mechanisms in TypeScript, ensuring more robust and reliable code.
Full list of covered topics
The actual topics of the questions in the final test will depend on your job description and requirements. However, here's a list of topics you can expect the questions for TypeScript Online Test to be based on.
Variables
Functions
Objects
Arrays
Conditionals
Loops
Hoisting
Scopes
Closures
Prototypes
ES6
Arrow functions
Destructuring
Spread syntax
Rest parameters
Template literals
Classes
Inheritance
Polymorphism
Encapsulation
Access modifiers
Interfaces
Modules
Promises
Async/Await
TypeScript Compiler
Type Annotations
Type Inference
Type Guards
Declaration Merging
Namespace
Generics
Decorators
Webpack Configuration
Entry Points
Loaders
Plugins
Code Splitting
Tree Shaking
Exception Handling
Event Handling
DOM Manipulation
AJAX
Web APIs
LocalStorage
SessionStorage
HTML5 Canvas
Error Handling
Code Debugging
Unit Testing
Mocking
Git Version Control
Branches
Merging
Commits
Stashing
Repository Cloning
Push and Pull
Conflict Resolution

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What roles can I use the TypeScript Online Test for?

Web Developer
Software Engineer
Full Stack Developer
Front End Developer
Back End Developer
UI Developer
JavaScript Developer
TypeScript Developer
Angular Developer
React Developer
Senior Software Engineer (TypeScript)

How is the TypeScript Online Test customized for senior candidates?

For intermediate/ experienced candidates, we customize the assessment questions to include advanced topics and increase the difficulty level of the questions. This might include adding questions on topics like

Implementing object-oriented programming principles
Debugging JavaScript and TypeScript code
Optimizing code performance
Implementing unit tests for JavaScript and TypeScript code
Using design patterns in JavaScript and TypeScript
Utilizing functional programming concepts in JavaScript
Using data structures and algorithms in JavaScript and TypeScript
Working with RESTful APIs using JavaScript and TypeScript
Integrating external libraries and frameworks in JavaScript and TypeScript
Deploying JavaScript and TypeScript applications to production environments

The coding question for experienced candidates will be of a higher difficulty level to evaluate more hands-on experience.

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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

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TypeScript Hiring 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. Here's a quick guide on how you can request a custom test.

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
Screen proctoring
Web proctoring
Webcam proctoring
Plagiarism detection
Secure browser
Copy paste protection

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.