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JavaScript Online 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.

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Screen candidates with a 40 mins test

Test duration:  40 mins
Difficulty level:  Moderate
Availability:  Ready to use
Questions:
  • 8 JavaScript MCQs
  • 1 JavaScript Coding Question
Covered skills:
JavaScript basics (arrays; objects; strings; functions)
Structuring and styling HTML DOM
Errors and Exception Handling
Working with user data and JSON
ES6 (arrow functions; destructuring; spreads)
higher-order functions and closures
OOP (classes; constructors; prototypal inheritance)
Asynchronous JavaScript (event loop; promises; async/await)
Handling APIs
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Adaface skill assessments measure on-the-job skills of candidates, providing employers with an accurate tool for screening potential hires.

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Use the JavaScript Test to shortlist qualified candidates

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
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Screen candidates with the highest quality 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 15,000+ 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

Test candidates on core JavaScript Hiring Test topics

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.

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Have questions about the JavaScript Hiring Test?

How does pricing work?

You can check out our pricing plans.

Can I customize the test?

Yes, absolutely. Custom assessments are set up within 48 hours 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. You can also customize a test by uploading your own questions.

Can I combine multiple skills into one test?

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.

What roles can I use the JavaScript Test for?

Here are few roles for which we recommend this test:

  • JavaScript Developer
  • Front-end Developer
  • Full Stack Developer
  • Web Developer
  • UI/UX Developer
  • Web Application Developer
  • Mobile App Developer
  • Game Developer
  • Software Developer
Can I see a sample test, or do you have a free trial?

Yes!

The free trial includes one sample technical test (Java/ JavaScript) and one sample aptitude test that you will find in your dashboard when you sign up. You can use it to review the quality of questions and the candidate experience of giving a test on Adaface.

You can preview any of the 500+ tests and see the sample questions to decide if it would be a good fit for your requirements.

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.

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.

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