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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

9 reasons why
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

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
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?
 image
 image

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.
 image
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:
 image
 image
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: 
 image
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?
 image
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: 
 image
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?
 image
 image

Medium

Promise Resolve
Promises
Async-Await
Solve
What does the following code output? 
 image

Easy

Throw, Try, Async
Promises
Async-Await
Solve
What does the following JS code output?
 image

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

Medium

Truthiness
Narrowing

3 mins

TypeScript
Solve

Hard

Types

2 mins

TypeScript
Solve

Medium

Async Await Promises
Promises
Async-Await

2 mins

JavaScript
Solve

Medium

Bitcoin prices
Axios
Promises

2 mins

JavaScript
Solve

Medium

My Module
Scope

2 mins

JavaScript
Solve

Medium

Promise Resolve
Promises
Async-Await

2 mins

JavaScript
Solve

Easy

Throw, Try, Async
Promises
Async-Await

2 mins

JavaScript
Solve

Easy

Registration Queue
Logic
Queues

30 mins

Coding
Solve

Medium

Visitors Count
Strings
Logic

30 mins

Coding
Solve
🧐 Question🔧 Skill💪 Difficulty⌛ Time
Alias
OOPs
TypeScript
Medium2 mins
Solve
Truthiness
Narrowing
TypeScript
Medium3 mins
Solve
Types
TypeScript
Hard2 mins
Solve
Async Await Promises
Promises
Async-Await
JavaScript
Medium2 mins
Solve
Bitcoin prices
Axios
Promises
JavaScript
Medium2 mins
Solve
My Module
Scope
JavaScript
Medium2 mins
Solve
Promise Resolve
Promises
Async-Await
JavaScript
Medium2 mins
Solve
Throw, Try, Async
Promises
Async-Await
JavaScript
Easy2 mins
Solve
Registration Queue
Logic
Queues
Coding
Easy30 minsSolve
Visitors Count
Strings
Logic
Coding
Medium30 minsSolve
Reason #4

1200+ customers in 75 countries

customers in 75 countries
Brandon

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.

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.

invite candidates
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.

test completion rate
Reason #9

Advanced Proctoring


Learn more

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

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.

Singapore government logo

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

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.

I'm a candidate. Can I try a practice test?

No. Unfortunately, we do not support practice tests at the moment. However, you can use our sample questions for practice.

What is the cost of using this test?

You can check out our pricing plans.

Can I get a free trial?

Yes, you can sign up for free and preview this test.

I just moved to a paid plan. How can I request a custom assessment?

Here is a quick guide on how to request a custom assessment on Adaface.

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