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About the test:

The JavaScript test uses scenario-based MCQs to evaluate candidates on JavaScript fundamentals (ES5, ES6), ability to manipulate HTML DOM and Asynchronous programming with Ajax, Fetch API, Promises & Async / Await. The test includes coding questions to evaluate hands-on JavaScript programming skills.

Covered skills:

  • JavaScript basics (arrays; objects; strings; functions)
  • Errors and Exception Handling
  • ES6 (arrow functions; destructuring; spreads)
  • OOP (classes; constructors; prototypal inheritance)
  • Handling APIs
  • Structuring and styling HTML DOM
  • Working with user data and JSON
  • higher-order functions and closures
  • Asynchronous JavaScript (event loop; promises; async/await)

9 reasons why
9 reasons why

Adaface JavaScript Test is the most accurate way to shortlist JavaScript Developers



Reason #1

Tests for on-the-job skills

The JavaScript 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:

  • Proficient in JavaScript basics including arrays, objects, strings, and functions
  • Knowledge of structuring and styling HTML DOM
  • Ability to handle exceptions and errors efficiently
  • Experience in working with user data and JSON
  • Familiarity with ES6 features such as arrow functions, destructuring, and spreads
  • Understanding of higher-order functions and closures
  • Competence in OOP concepts including classes, constructors, and prototypal inheritance
  • Capability to work with Asynchronous JavaScript using event loop, promises, and async/await
  • Skill in handling APIs
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 JavaScript Online Test will be non-googleable.

🧐 Question

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

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
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 JavaScript 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 JavaScript 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

View sample scorecard
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 JavaScript Assessment Test

Why you should use Pre-employment JavaScript Online Test?

The JavaScript 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 and applying JavaScript basics including arrays, objects, strings, and functions
  • Structuring and styling HTML DOM elements using JavaScript
  • Handling exceptions and errors in JavaScript
  • Working with user data and JSON in JavaScript
  • Applying ES6 features such as arrow functions, destructuring, and spreads
  • Utilizing higher-order functions and closures in JavaScript
  • Implementing object-oriented programming concepts including classes, constructors, and prototypal inheritance in JavaScript
  • Understanding and utilizing asynchronous JavaScript concepts such as the event loop, promises, and async/await

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 JavaScript Online Test?

  • JavaScript basics:

    JavaScript basics in this test cover arrays, objects, strings, and functions. It is important to measure this skill as a strong foundation in these concepts is crucial for writing efficient and effective JavaScript code.

  • Structuring and styling HTML DOM:

    This skill involves organizing and designing the structure of HTML elements using DOM (Document Object Model). It is measured to assess the candidate's ability to manipulate and style web page elements dynamically.

  • Errors and Exception Handling:

    Errors and exception handling refer to the ability to identify and handle errors in JavaScript code. This skill is essential to ensure smooth execution and maintenance of error-free applications, and thus, is evaluated in the test.

  • Working with user data and JSON:

    Assessing how well a candidate can interact with user data and JSON (JavaScript Object Notation) is important to gauge their ability to handle and process user input effectively and efficiently.

  • ES6:

    This skill covers advanced JavaScript concepts introduced in ECMAScript 6 (ES6), such as arrow functions, destructuring, and spreads. It is measured to evaluate a candidate's familiarity and proficiency with modern JavaScript syntax and features.

  • Higher-order functions and closures:

    Higher-order functions and closures are fundamental concepts in JavaScript that enable functional programming and code reusability. Measuring this skill helps assess a candidate's ability to write clean and maintainable code using these concepts.

  • OOP:

    This skill evaluates a candidate's understanding and implementation of Object-Oriented Programming (OOP) principles in JavaScript. It includes knowledge of classes, constructors, and prototypal inheritance, which play a crucial role in building scalable and modular applications.

  • Asynchronous JavaScript:

    Assessing a candidate's knowledge of handling asynchronous operations in JavaScript, including the event loop, promises, and async/await, is crucial to determine their ability to write responsive and efficient code that deals with time-consuming tasks.

  • Handling APIs:

    This skill measures the candidate's proficiency in consuming and integrating APIs (Application Programming Interfaces) in JavaScript. It includes knowledge of making API requests, handling responses, and parsing data, which are essential for building web applications that interact with external services and databases.

  • 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 JavaScript Online Test to be based on.

    JavaScript syntax
    Data types
    Variables
    Arrays
    Objects
    Strings
    Functions
    DOM manipulation
    CSS styling
    Error handling
    Try...catch blocks
    Throwing exceptions
    User input
    Validation
    JSON parsing
    JSON stringification
    ES6 syntax
    Arrow functions
    Destructuring
    Spread operator
    Higher-order functions
    Closures
    Classes
    Constructors
    Prototypal inheritance
    Event loop
    Promises
    Async/await
    Fetch API
    XHR requests
    Response handling
    Handling JSON data
    Working with APIs
    Access control
    Cross-origin resource sharing
    Authentication
    Authorization
    CORS
    RESTful APIs
    AJAX
    Callback functions
    Promisify
    Error handling in asynchronous code
    Timeouts and intervals
    XML parsing
    WebSockets
    Local storage
    Session storage
    Browser cookies
    Testing JavaScript code
    Debugging
    Performance optimization
    Module systems
    Bundler tools
    Linting
    Code quality
    Accessibility
    Responsive design
    Mobile optimization
    Single-page applications
    Progressive Web Apps
    Web workers
    WebSockets

What roles can I use the JavaScript Online Test for?

  • JavaScript Developer
  • Front-end Developer
  • Full Stack Developer
  • Web Developer
  • UI/UX Developer
  • Web Application Developer
  • Mobile App Developer
  • Game Developer
  • Software Developer

How is the JavaScript 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

  • Handling APIs in JavaScript
  • Applying JavaScript security best practices to prevent vulnerabilities
  • Working with different data structures in JavaScript such as sets and maps
  • Implementing data validation and sanitization techniques in JavaScript
  • Understanding and troubleshooting common JavaScript runtime errors
  • Working with JavaScript modules and module loaders
  • Implementing responsive web design using JavaScript
  • Performing browser compatibility testing for JavaScript

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

JavaScript Hiring Test FAQs

Can I evaluate framework skills along with JavaScript?

Yes. We provide ready-to-go tests where you can assess multiple relevant JavaScript skills in a single assessment. For example, our JavaScript + React + HTML/ CSS test can be used to evaluate all the JS, ReactJS, HTML, CSS and coding skills in a single assessment.

We also provide customized assessments where we customize the assessment according to your job description.

Can I use this test for evaluating backend JavaScript developer?

Yes. This test is used to assess core JavaScript skills. The questions are designed to evaluate standalone JS skills without depending on HTML/ CSS. Suppose your role requires candidates to have knowledge of backend JS frameworks like NodeJS. In that case, you can look into using our JS backend developer assessment, where JS and NodeJS and coding skills are evaluated in a single test.

Can I use this test for React Native developer?

Yes. The assessment is focused on JS skills. You can also check the Adaface React Native assessment that evaluates React Native, JS and coding skills in a single test. You can also request a custom React Native test that will be designed as per your job description.

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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