AJAX online test

Q: What are the main Front End tests?

Some key frontend tests include: JavaScript Online Test HTML/CSS Online Test React.js Online Test Vue.js Test

The AJAX online test evaluates a candidate's proficiency in asynchronous web development techniques. It covers essential AJAX concepts, XMLHttpRequest usage, JSON parsing, and RESTful API integration. The test includes MCQs on AJAX fundamentals and JavaScript, as well as coding questions to assess practical implementation skills in creating dynamic and responsive web applications.

Covered skills:

AJAX Fundamentals
XMLHttpRequest Object
JSON Parsing
Asynchronous Programming
RESTful API Integration
Error Handling in AJAX
Cross-Origin Resource Sharing (CORS)
JavaScript Event Handling
DOM Manipulation
AJAX Security Considerations
Performance Optimization
AJAX Libraries and Frameworks

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About the AJAX Test

The AJAX 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:

Ability to create and send AJAX requests using XMLHttpRequest or Fetch API
Proficiency in handling asynchronous operations and callbacks in JavaScript
Skill in parsing and manipulating JSON data received from server responses
Capability to integrate RESTful APIs and handle various HTTP methods
Expertise in implementing error handling and debugging techniques for AJAX applications
Competence in addressing cross-origin resource sharing (CORS) issues and implementing solutions
Proficiency in JavaScript event handling and DOM manipulation for dynamic content updates
Ability to optimize AJAX performance through techniques like caching and request batching
Understanding of AJAX security considerations and implementation of best practices
Familiarity with popular AJAX libraries and frameworks for efficient development

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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 15,000+ questions. The actual questions on this AJAX online test will be non-googleable.

🧐 Question
Medium Async Await Promises Promises Async-Await Asynchronous Programming	Solve
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
Medium Bitcoin prices Axios Promises	Solve
Review the following JavaScript code and pick the correct options: 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 Javascript Es6 Closure	Solve
What will the output of the following JavaScript code be?
Medium Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	Solve
What does the following code output?
Easy Throw, Try, Async Promises Async-Await Async/await	Solve
What does the following JS code output?

	🧐 Question	🔧 Skill
	Medium Async Await Promises Promises Async-Await Asynchronous Programming	2 mins JavaScript	Solve
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
	Medium Bitcoin prices Axios Promises	2 mins JavaScript	Solve
Review the following JavaScript code and pick the correct options: 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 Javascript Es6 Closure	2 mins JavaScript	Solve
What will the output of the following JavaScript code be?
	Medium Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	2 mins JavaScript	Solve
What does the following code output?
	Easy Throw, Try, Async Promises Async-Await Async/await	2 mins JavaScript	Solve
What does the following JS code output?

	🧐 Question	🔧 Skill	💪 Difficulty	⌛ Time
	Async Await Promises Promises Async-Await Asynchronous Programming	JavaScript	Medium	2 mins	Solve
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
	Bitcoin prices Axios Promises	JavaScript	Medium	2 mins	Solve
Review the following JavaScript code and pick the correct options: 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?
	My Module Scope Javascript Es6 Closure	JavaScript	Medium	2 mins	Solve
What will the output of the following JavaScript code be?
	Promise Resolve Promises Async-Await Code Analysis Syntax Understanding	JavaScript	Medium	2 mins	Solve
What does the following code output?
	Throw, Try, Async Promises Async-Await Async/await	JavaScript	Easy	2 mins	Solve
What does the following JS code output?

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Why you should use Pre-employment AJAX online test?

The AJAX 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:

Making asynchronous requests using AJAX
Creating XMLHttpRequest objects for requests
Parsing JSON data from responses
Handling asynchronous programming in JavaScript
Integrating RESTful APIs with AJAX
Handling errors in AJAX requests
Implementing Cross-Origin Resource Sharing (CORS)
Managing JavaScript events
Manipulating the DOM with JavaScript
Ensuring AJAX security considerations

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 AJAX online test?

AJAX Fundamentals: AJAX (Asynchronous JavaScript and XML) is a set of web development techniques that allows web applications to send and retrieve data from a server asynchronously without interfering with the display and behavior of the existing page. It enables partial page updates, improving user experience and reducing server load. Understanding AJAX fundamentals is crucial for creating dynamic and responsive web applications.

XMLHttpRequest Object: The XMLHttpRequest object is the core of AJAX, allowing client-side scripts to perform HTTP requests to exchange data with servers. It provides methods to send requests and properties to access the server's response. Mastery of XMLHttpRequest is essential for implementing AJAX functionality in web applications.

JSON Parsing: JSON (JavaScript Object Notation) is a lightweight data interchange format widely used in AJAX applications. Parsing JSON involves converting JSON strings into JavaScript objects and vice versa. This skill is critical for handling data communication between client and server in modern web development.

Asynchronous Programming: Asynchronous programming is a core concept in AJAX, allowing execution of code without blocking the main thread. It enables non-blocking operations, improving application performance and responsiveness. Proficiency in asynchronous programming techniques, including callbacks, promises, and async/await, is vital for effective AJAX implementation.

RESTful API Integration: RESTful APIs are a common way to expose server-side functionality to AJAX applications. Integration involves making HTTP requests to API endpoints and handling responses. This skill is essential for building scalable and interoperable web applications that leverage external services and data sources.

Error Handling in AJAX: Robust error handling is crucial in AJAX applications to manage network issues, server errors, and unexpected responses. It involves implementing try-catch blocks, handling HTTP status codes, and providing meaningful feedback to users. Effective error handling enhances application reliability and user experience.

Cross-Origin Resource Sharing (CORS): CORS is a security mechanism that allows web applications to make cross-origin AJAX requests. Understanding CORS is essential for developers working with APIs from different domains. It involves configuring server headers and handling preflight requests to ensure secure cross-origin data transfer.

JavaScript Event Handling: Event handling in JavaScript is fundamental to AJAX applications, enabling interaction with user actions and asynchronous operations. It involves attaching event listeners, managing event propagation, and implementing event-driven architectures. Proficiency in event handling is crucial for creating responsive and interactive web applications.

DOM Manipulation: DOM manipulation is the process of modifying the Document Object Model in response to AJAX requests. It involves dynamically updating page content, creating new elements, and modifying existing ones. This skill is essential for seamlessly integrating AJAX responses into the user interface.

AJAX Security Considerations: Security is paramount in AJAX applications to prevent vulnerabilities like cross-site scripting (XSS) and cross-site request forgery (CSRF). This skill involves implementing proper input validation, output encoding, and secure communication protocols. Understanding security best practices is crucial for building robust and trustworthy AJAX applications.

Performance Optimization: Optimizing AJAX performance involves techniques such as request batching, caching, and minimizing payload size. It also includes strategies for efficient DOM updates and managing asynchronous operations. Performance optimization skills are essential for creating fast and scalable AJAX applications that provide a smooth user experience.

AJAX Libraries and Frameworks: Knowledge of popular AJAX libraries and frameworks, such as jQuery, Axios, or Fetch API, is valuable for efficient development. These tools provide abstractions and utilities that simplify AJAX implementation and offer cross-browser compatibility. Familiarity with various libraries enables developers to choose the most suitable tool for specific project requirements.

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 AJAX online test to be based on.

XMLHttpRequest

Fetch API

Async/Await

Promises

Callbacks

JSON.parse()

JSON.stringify()

RESTful APIs

GET requests

POST requests

PUT requests

DELETE requests

Error handling

Try/Catch

CORS

Same-origin policy

Event listeners

DOM traversal

DOM manipulation

innerHTML

appendChild()

removeChild()

AJAX caching

Request batching

Load balancing

XSS prevention

CSRF protection

Input validation

jQuery AJAX

Axios

FormData

Blob handling

File uploads

Progress events

Timeout handling

Abort controller

HTTP headers

Content-Type

Authorization

Status codes

Response parsing

Error objects

Debugging tools

Network tab

Console logging

JSONP

WebSockets

Server-Sent Events

Long polling

Data serialization

API versioning

Rate limiting

Pagination

Query parameters

URL encoding

Base64 encoding

What roles can I use the AJAX online test for?

Front-end Developer
Full Stack Developer
Web Developer
JavaScript Developer
UI Developer
Software Engineer
Web Application Developer
AJAX Specialist
Client-side Developer
Interactive Web Designer

How is the AJAX 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

Optimizing performance for AJAX calls
Using AJAX libraries and frameworks
Handling complex JSON data structures
Managing state changes with asynchronous responses
Handling large volumes of data in AJAX
Implementing advanced error handling mechanisms
Ensuring robust RESTful API integration
Optimizing AJAX for scalability
Using advanced JavaScript patterns with AJAX
Implementing and handling WebSockets with AJAX

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Have questions about the AJAX Hiring Test?

What is AJAX online test?

The AJAX online test assesses a candidate's knowledge and skills in AJAX and related technologies. It's ideal for recruiters and hiring managers to evaluate proficiency in AJAX, including understanding of fundamentals, asynchronous programming, and RESTful API integration.

Can I combine AJAX online test with JavaScript questions?

Yes, you can combine the AJAX online test with JavaScript questions. Consider our JavaScript Online Test to get an overview of how we assess JavaScript skills.

What topics are evaluated in the AJAX online test?

The test covers AJAX fundamentals, XMLHttpRequest Object, JSON Parsing, Asynchronous Programming, RESTful API Integration, Error Handling in AJAX, CORS, JavaScript Event Handling, DOM Manipulation, AJAX Security, Performance Optimization, and AJAX Libraries/Frameworks.

How to use AJAX online test in my hiring process?

Use the AJAX online test as a pre-screening tool at the start of your recruitment process. Add a link to the assessment in your job post or invite candidates via email. It helps in identifying skilled candidates early in the process.

What are the main Front End tests?

Some key frontend tests include:

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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Along with scorecards that report the performance of the candidate in detail, you also receive a comparative analysis against the company average and industry standards.

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