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JavaScript Online Test

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
  • Structuring and styling HTML DOM
  • Working with user data and JSON
See all covered skills

9 reasons why
9 reasons why

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

Reason #1

Tests for on-the-job skills

JavaScript online test is designed and validated by industry experts to help tech recruiters and hiring managers to assess the JavaScript programming skills of the candidate. The JavaScript test screens the following skills that hiring managers look for in candidates:

  • JavaScript fundamentals: variables, if/else, operators, boolean logic, functions, arrays, objects, loops, strings
  • ES6: arrow functions, destructuring, spread operator, optional chaining (ES2020), etc
  • Object-oriented programming: prototypal inheritance, constructor functions (ES5), classes (ES6), encapsulation, abstraction, inheritance, and polymorphism
  • Core JavaScript concepts like 'this', 'call', 'bind', higher-order functions, closures, timers, callbacks, IIFE
  • Asynchronous JavaScript: Event loop, promises, async/await
  • JSON data from API source using AJAX
  • JavaScript in the Browser: DOM, Cookies and Events Fundamentals
  • Create dynamic HTML components like tooltips, slideshows, galleries with thumbnails
  • Debugging JavaScript using browser console and inspector
  • Experience designing cross-browser and cross-device compatible UI

The insights generated from this assessment can be used by recruiters and hiring managers to identify the best candidates for the role. Anti-cheating features enable you to be comfortable with conducting assessments online.

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 JavaScript Online Test will be non-googleable.

🧐 Question


Async Await Promises
                        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


  • A
  • B
  • C
  • D
  • E
  • F
  • G


Promise Resolve
                        What does the following code output?


  • A, B and A, B
  • B, A and B, A
  • A, B and B, A
  • B, A and A, B


Throw, Try, Async
                        What does the following JS code output?


  • Data
  • Error
  • Finale
  • Data Finale
  • Error Finale


Longest Road
                        A startup company E-Motors is building driverless automated cars. The car contains a sensor that checks the road quality for the next N meters to decide the optimal speed at which the cars should move. We are given recorded data by the sensor in the form of an array, where each element of the array is the rating given to 1 meter of the road in sequence. 

The rating given by the sensor is from 1 to 100, where 100 represents the road with the best condition, and any rating above 60 is optimal. Find the longest stretch of road in meters that is categorized as optimal by the sensor.

The input is an array of "strings" which needs to be converted from string to integer/number inside the function.
    🧐 Question🔧 Skill


    Async Await Promises
    2 mins


    Promise Resolve
    2 mins


    Throw, Try, Async
    2 mins


    Longest Road
    25 mins
    🧐 Question🔧 Skill💪 Difficulty⌛ Time
    Async Await Promises
    Medium2 minsSolve
    Promise Resolve
    Easy2 minsSolve
    Throw, Try, Async
    Easy2 minsSolve
    Longest Road
    Medium25 minsSolve
    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

    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.

    Reason #6

    Detailed scorecards & comparative results

    Reason #7

    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.

    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

    How do you customize the test for Senior JavaScript developers?

    The questions for Senior developers assess advanced topics like:

    • Advanced concepts such as closures, prototypal inheritance, IIFEs
    • Advanced DOM and event-driven programming
    • Understanding JavaScript works behind the scenes: engines, the call stack, hoisting, scoping, the 'this' keyword, reference values
    • Advanced functions: arrow functions, first-class and higher-order functions, bind, and closures
    • Storing data with cookies, local storage and session storage
    • Caching with Service workers
    • Networking concepts like CORS and JSONP
    • Previous class patterns: Prototype Pattern, Pseudo Classical/ Constructor Pattern
    • Pros and cons of callbacks, promises, and async/await
    • Advanced data structures like Maps, Sets
    • Garbage collection and memory management
    • Creating a custom Javascript framework or library
    • JavaScript tooling: NPM, Parcel, Babel

    Additionally, the test might consist of questions assessing candidates' ability to use databases (like SQL) and frameworks (like React, Angular, Vue, and Svelte).

    What roles can I use the JavaScript Online Test for?

    • JavaScript Developer
    • Frontend Engineer
    • Backend JavaScript Developer
    • Full Stack Software Developer
    • NodeJS Developer
    • React Developer
    • Angular Developer
    • Software Engineer 1

    What topics are covered in the JavaScript Online Test?

    Types and operators
    HTML/ CSS fundamentals
    Local storage
    Session storage
    this', 'call', 'bind' keywords
    Event handling
    Exception handling
    Form handling
    Service workers
    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.

    reduction in screening time

    Javascript Online 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.

    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.

    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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