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JavaScript Developer Test

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Type

Programming Skills

Time

10 minutes

Level

Medium

Questions

10

About the Test

This javascript assessment test helps recruiters hire candidates with knowledge and experience in different basics, syntaxes, variables and operators, functions, arrays, and foundations of the javascript language.

This online JavaScript assessment test is curated to identify experienced javascript developers who can develop responsive web-based programs or applications and implement front-end visual logics that is essential in web design. This test assesses a candidate’s skills, aptitude, and understanding of using different syntaxes to create variables to store data or numbers, calculate using operators, a program using functions and create sets using arrays.

Javascript is used to add responsiveness to any web-based applications and websites. Most companies have an online presence these days. An experienced javascript developer can make their websites appear more optimized for faster loading and attractive visuals with easy-to-understand UI. This assessment test offers a complete bias-free result for all the test takers and efficiently boosts the hiring process for the team.

This javascript test is beneficial when hiring javascript developers, front-end programmers, web designers, and full-stack developers. Candidates excelling in this test will be able to maintain the organizations’ website’s responsive structure, add web security, provide front-logic and implement fixes.

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Skills Measured

  • Basic
  • Syntax
  • Variables & Operators
  • Functions
  • Array

Roles

  • JavaScript Developer
  • AngularJS Developer
  • HTML
  • Node.JS developer
  • .NET Javascript
  • Frontend Developer
  • Fullstack Developer

Recruiting for JavaScript Developer

Job roles like web designer, front-end developer, and javascript developer should have a detailed understanding of the skills needed to design and develop Blockchain technologies. Some other subskills that also get measured in this assessment are as follows;

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Testlify helps you identify the best talent from anywhere in the world, with a seamless experience that candidates and hiring teams love every step of the way.

1

Basic

A JavaScript program consists of two parts: one part which includes the code itself and another part that contains properties and methods specific to that program only. The test takers should know how to execute a program meticulously.

2

Syntax

The syntaxes of JavaScript are essential because they determine how the interpreter will interpret your code. The test taker must understand the correlation between arrays and objects.

3

Variables and operators

Variables are a place to store data, and you can use a variable to store any data, like a number, a string, or an array. Operators are special symbols that you can use in JavaScript code to perform operations on variables. There are four basic types of operators: arithmetic (including addition (+), subtraction (-), multiplication (*), and division (/), that the test taker should know how to use.

4

Functions

The function syntax is a language feature that allows you to define a function with an intuitive, human-readable syntax. It’s a way for us to give users more control over how their code works, so they can use it in ways that are easier for them to understand and more flexible for the developer.

5

Arrays

An array is a data structure that can store multiple values at once. In JavaScript, an array is represented as a list of values, where each value is an object or a primitive value.

The test is created by a subject-matter expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

View sample score cards

Top five hard skills interview questions for JavaScript Developer

1. What are some of the differences between prototypal and classical inheritance in JavaScript?
Why this Matters?

Understanding inheritance in JavaScript is critical for building scalable and maintainable code, and this question helps to evaluate the candidate’s proficiency in this key area.

What to listen for?

The candidate should be able to articulate the key differences between the two types of inheritance, including how they are implemented and when each should be used.

2. Can you explain the difference between synchronous and asynchronous code in JavaScript?
Why this Matters?

Asynchronous programming is a fundamental concept in JavaScript, and this question can help to gauge the candidate’s knowledge of how to write efficient and responsive code.

What to listen for?

The candidate should be able to explain the differences between synchronous and asynchronous code, as well as how to write asynchronous code using callbacks, promises, and async/await.

3. How do you optimize the performance of JavaScript code?
Why this Matters?

Performance is a key consideration when developing web applications, and understanding how to optimize JavaScript code can have a significant impact on the overall user experience.

What to listen for?

The candidate should be able to discuss different techniques for optimizing JavaScript performance, including minimizing HTTP requests, using code bundlers and minifiers, and using tools like Lighthouse and DevTools to identify performance bottlenecks.

4. Can you explain the purpose of closures in JavaScript?
Why this Matters?

Closures are a powerful concept in JavaScript, and understanding how they work can help developers write more concise and modular code.

What to listen for?

The candidate should be able to explain the concept of closures, as well as how to use them to create private variables and methods in JavaScript.

5. Have you ever used a JavaScript framework like React, Angular, or Vue? If so, can you explain how it works and what you like about it?
Why this Matters?

Frameworks are a key part of modern JavaScript development, and understanding how to use them can help developers build complex and responsive applications more quickly.

What to listen for?

The candidate should be able to explain the basic concepts of a popular JavaScript framework, as well as how they have used it in the past and what they like about it. They should also be able to discuss any challenges they faced while working with the framework, and how they overcame them.

Frequently Asked Questions for JavaScript Developer

A JavaScript assessment evaluates a candidate’s knowledge and skills in front-end web development and JavaScript programming, including their understanding of fundamental principles in these areas.

A JavaScript assessment can be used by recruiters and hiring managers to evaluate candidates’ knowledge and skills in JavaScript programming, including their understanding of JavaScript principles and their ability to use JavaScript to build interactive web applications.

  • JavaScript Developer
  • AngularJS Developer
  • HTML
  • Node.JS developer
  • .NET JavaScript
  • Front-End Developer
  • Full Stack Developer

  • Basic
  • Syntax
  • Variables & Operators
  • Functions
  • Array

  • Writing and testing code using JavaScript and related technologies to build web applications.
  • Debugging and troubleshooting issues that arise during the development process.
  • Maintaining and updating existing code to fix bugs and add new features as needed.
  • Participating in code reviews and providing feedback to other developers on the team.

Frequently Asked Questions (FAQs)

Want to know more about Testlify? Here are answers to the most commonly asked questions about our company.

These are ready-made tests, existing in our test library, created by subject matter experts. We have 200+ such skills tests covering various skills from programming skills to DevOps, including Aptitude and Personality testing.

You can go to the ‘Test Library’ tab and search for tests from the Job Role or Test Type drop-down menu.

Currently, we do not offer any sample tests. However, when you select a test, there would be a few practice questions before the start of the actual test, which would give you a fair idea of how the entire test would look.

Our tests typically take between 25-30 minutes to complete.

In case you need to test for a unique skill-set or specialized experience, you can add your own questions and customize the test to suit your requirements.

We’ve put a lot of effort into ensuring a conducive test environment. A stable internet connection, an internet browser with cookies and Java-Script enabled is all that is required!
However, for a smooth test-taking process, we recommend the following browsers:
– Google Chrome
– Internet Expl
– Mozilla Firefox

Yes, our tests are compatible with almost all modern mobile devices (including tablets) that have a webcam installed.

Yes, our tests are EEOC (Equal Employment Opportunity Commission) compliant and are whetted by subject matter experts, thus having high reliability (test consistency) and validity (accuracy of the test).

Yes! We integrate with popular recruiting tools such as Greenhouse, Lever, GoodTime, and many more.

We are GDPR compliant and take data security very seriously. You have complete ownership of your data. All your data is safe and secure, and we do not expose it to any third party.

Testlify is an excellent tool for assessing candidates’ soft and hard skills. The founder and customer success team were helpful during onboarding and demonstrated a commitment to continuously improving the platform.
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Founder, ExpHire
Testlify’s integration with ATS makes it simple to incorporate into recruitment processes. Customizable test suites, open-ended questions, and qualifying questions streamline the candidate assessment process and improve collaboration with hiring managers. 
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 Founder, White
A must-have tool in any HR department! Well thought out a comprehensive platform that shortens the candidate selection time significantly.
Meir Shachar
CEO at PowerLinx
With Testlify, we were able to optimize our initial screening process by upwards of 75%.
We saved a tremendous amount
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President, Arch Advisory Group
Testlify has revolutionized our hiring process by streamlining the screening stage. It has saved us countless hours by allowing us to shortlist the right candidates.
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CEO at Sookshum Labs

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