Free JavaScript Skill Exam Certification

Are you looking to validate your JavaScript skills and enhance your resume without spending a fortune? Obtaining a JavaScript certification is a smart move for developers seeking to stand out in the competitive tech industry.

JavaScript certification exam

Attempt JavaScript certification exam online without any cost and get international certificate instantly without any cost.

JavaScript Skill Exam

1 / 20

1. Explain the concept of modules in Node.js and how they are used for code organization.

Option: Modules are self-contained code units that can be imported and exported using require and module.exports.

Option: Modules are only used for client-side JavaScript.

Option: Modules are defined using classes.

Option: Node.js doesn't have a module system.

Report Question Answer

2 / 20

2. What is the spread operator (...) used for in JavaScript?

Option: To perform mathematical calculations

Option: To concatenate strings

Option: To spread elements of an iterable into individual arguments or elements within an array or object.

Option: To access DOM elements

Report Question Answer

3 / 20

3. How can you utilize generators and iterators in JavaScript for efficient handling of large datasets?

Option: Generators allow defining functions that can pause and resume execution, iterators provide a way to access elements one at a time.

Option: Generators are used for creating custom DOM elements.

Option: Iterators are for modifying existing arrays.

Option: Not a recommended approach for large datasets.

Report Question Answer

4 / 20

4. Explain the difference between prototype-based inheritance and delegation in JavaScript.

Option: Prototype-based inheritance defines a hierarchy, delegation allows accessing properties from another object dynamically.

Option: Delegation is for object properties, inheritance is for methods.

Option: They are the same concept with different names.

Option: Inheritance requires classes, delegation can be used with objects.

Report Question Answer

5 / 20

5. What is the purpose of a Promise object in JavaScript?

Option: To define a function that will be executed later.

Option: To store and manipulate data.

Option: To handle user input validation.

Option: To style HTML elements.

Report Question Answer

6 / 20

6. What are the common methods used to handle errors in asynchronous code with promises?

Option: try...catch block can be used within a promise's then or catch methods.

Option: Error handling is done manually by checking return values.

Option: JavaScript doesn't have built-in error handling for asynchronous code.

Option: All errors are automatically logged to the console.

Report Question Answer

7 / 20

7. How can you handle circular references in JavaScript when working with complex data structures?

Option: By avoiding nested objects and arrays.

Option: Using weak references that can be garbage collected independently.

Option: Manually breaking circular references by setting properties to null.

Option: Circular references are not a problem in JavaScript.

Report Question Answer

8 / 20

8. What is the role of a bundler like Webpack in modern JavaScript development?

Option: To bundle multiple JavaScript files into a single file for faster loading.

Option: A bundler is only used for server-side JavaScript.

Option: Webpack is a framework for building web applications.

Option: Bundlers are not necessary for modern JavaScript development.

Report Question Answer

9 / 20

9. What is the correct syntax to define a function in JavaScript?

Option: function name(parameters) { code }

Option: define name(parameters) { code }

Option: func name(parameters) { code }

Option: create name(parameters) { code }

Report Question Answer

10 / 20

10. What is the difference between map and filter methods used with arrays in JavaScript?

Option: map creates a new array with modified elements, filter creates a new array with elements that pass a test.

Option: map is for numerical operations, filter is for string operations.

Option: map iterates forward, filter iterates backward.

Option: There is no difference.

Report Question Answer

11 / 20

11. What is the purpose of the event.preventDefault() method in JavaScript?

Option: To cancel the default behavior of an event (e.g., prevent a form submission).

Option: To modify the event object properties.

Option: To stop event propagation.

Option: To trigger a new event.

Report Question Answer

12 / 20

12. Which of the following is used to declare a variable in JavaScript?

Option: var

Option: let

Option: const

All of the above

Report Question Answer

13 / 20

13. What is the output of the following code: console.log(10 + "20");

Option: 1020

Option: 30

Option: Error

Option: 10

Report Question Answer

14 / 20

14. Which loop iterates over the elements of an array?

Option: if

Option: for

Option: while

Option: do-while

Report Question Answer

15 / 20

15. What is the correct way to define a default parameter value in a function?

Option: function name(param = value) { ... }

Option: function name(value = param) { ... }

Option: function name(param := value) { ... }

Option: None of the above

Report Question Answer

16 / 20

16. How do you push an element to the end of an array?

Option: add(array, element)

Option: push(array, element)

Option: insert(array, element)

Option: append(array, element)

Report Question Answer

17 / 20

17. What are the security considerations when working with user input in JavaScript applications?

Option: Always validate and sanitize user input to prevent attacks like XSS (Cross-Site Scripting) and SQL injection.

Option: JavaScript itself is secure against all attacks.

Option: User input validation is only necessary for server-side applications.

Option: Relying on browser security features is sufficient.

Report Question Answer

18 / 20

18. How do you access a property named "name" from an object?

Option: object.name

Option: getName(object)

Option: object["name"] (Also valid)

Option: None of the above

Report Question Answer

19 / 20

19. How do you clone a JavaScript object to avoid modifying the original?

Option: Directly assigning the object to a new variable creates a clone (This is shallow copy).

Option: var newObject = Object.assign({}, oldObject);

Option: var newObject = copy(oldObject);

Option: None of the above

Report Question Answer

20 / 20

20. How can you implement unit testing in JavaScript to ensure code quality and maintainability?

Option: Frameworks like Jest and Mocha allow writing isolated tests for individual functions and components.

Option: Unit testing is not necessary for small JavaScript projects.

Option: Testing relies on manual browser interaction.

Option: Not a common practice in modern JavaScript development.

Report Question Answer

Insert Correct Full Name and Valid Email ID

Your Full Name will be displayed on the certificate and score board.

Your email is needed for result processing, and it will be kept secure with no data sharing or spam. Incorrect details will delete from the system.

Full NameEmail

Your score is

JavaScript certification course

Do you want to join Javascript course? If yes! you can join and learn from market leader. You can learn Javascript exam quiz certificate with answers when you join any courses and simply participate here for Javascript exam quiz certificate online from QuizRanker site. Oh You can get Javascript exam quiz certificate free.

Join Now and Learn JavaScript

FAQ: Free JavaScript Skill Exam Certification

1. What is a JavaScript certification?

A JavaScript certification is a formal acknowledgment of your proficiency in JavaScript, demonstrating that you have the skills and knowledge to develop applications using this programming language.

2. How can I get a JavaScript certification from Microsoft and Google?

3. How do I prepare for a JavaScript certification exam?

To prepare for a JavaScript certification exam, you should: a. Study regularly using online resources and textbooks. b. Practice coding through exercises and real-world projects. c. Participate in coding bootcamps or online courses. d. Engage with study groups or online forums for support and collaboration.

4. What are the benefits of getting a JavaScript certification?

A JavaScript certification can: a. Validate your coding skills and knowledge. b. Enhance your resume and increase job opportunities. c. Potentially lead to higher salaries and career advancement. d. Provide a structured learning path and ensure you meet industry standards.

5. Can I take the JavaScript certification exam online?

Yes, most JavaScript certification exams can be taken online. Platforms like freeCodeCamp, Coursera, and Udemy offer online exams that you can complete from the comfort of your home.

Must Attempt and check knowledge

You can not use only JavaScript test online free on QuizRanker but also these skills.

Quiz Ranker

Our mission is to make educational content free and accessible to everyone. We create quizzes and study materials for both students and professional

JavaScript certification exam

Report a question

Insert Correct Full Name and Valid Email ID

JavaScript certification course

FAQ: Free JavaScript Skill Exam Certification

1. What is a JavaScript certification?

2. How can I get a JavaScript certification from Microsoft and Google?

3. How do I prepare for a JavaScript certification exam?

4. What are the benefits of getting a JavaScript certification?

5. Can I take the JavaScript certification exam online?

Must Attempt and check knowledge

Quiz Ranker