frontend for java full stack development coursera week 2 answers

Javascript - Practice Quiz

1. What is the purpose of the "name" attribute in an HTML form input element?

  • To specify the label for the input field.
  • To define the type of input field.
  • To provide a unique identifier for the input field.
  • To set a default value for the input field.

2. Which of the following are valid arithmetic operators in JavaScript?

  • +
  • –
  • *
  • All of the above

3. Which of the following is a conditional statement in JavaScript?

  • for loop
  • if/else statement
  • Both A and D
  • while loop

4. Which of the following are looping structures in JavaScript?

  • if/else statement
  • switch statement
  • for loop
  • while loop

DOM - Practice Quiz

5. What is the Document Object Model (DOM) in JavaScript?

  • A data type used to store documents
  • A programming language used to create documents
  • A programming interface for web documents
  • A file format used to store documents

6. How can you access and manipulate DOM elements with JavaScript?

  • By using CSS to modify DOM elements
  • By using JavaScript methods and properties
  • By using HTML to modify DOM elements
  • By using a server-side programming language to modify DOM elements

7. What are events and event listeners in JavaScript?

  • JavaScript functions used to create animations
  • HTML tags used to define web page structure
  • Actions or occurrences that happen in the browser, and event listeners are functions that respond to those actions or occurrences
  • JavaScript methods used to modify DOM elements

8. How can you respond to user input, such as clicks and key presses, with JavaScript?

  • By using HTML tags to define web page structure
  • By using CSS to style web page elements
  • By using event listeners in JavaScript
  • By using JavaScript methods to modify DOM elements

9. What is the purpose of creating interactive user interfaces with events in JavaScript?

  • To modify DOM elements with CSS
  • To define the structure of web pages with HTML
  • To allow users to interact with web pages and provide dynamic functionality
  • To modify JavaScript data types and variables

Javascript & DOM - Graded Quiz

10. Which method is used to create a new element in the DOM using JavaScript?

  • createElement()
  • createNode()
  • addElement()
  • appendChild()

11. What is AJAX an abbreviation for?

  • Asynchronous JavaScript and XML
  • Asynchronous JSON and XML
  • Asynchronous JavaScript and XHTML
  • Asynchronous JSON and XHTML

12. Which method is used to send an AJAX request in JavaScript?

  • sendRequest()
  • createRequest()
  • XMLHttpRequest()
  • ajaxRequest()

13. What is the purpose of the try-catch statement in JavaScript?

  • It is used to define a block of code to be executed repeatedly.
  • It is used to define a block of code to be executed conditionally.
  • It is used to handle errors and exceptions that may occur during code execution.
  • It is used to terminate the execution of a function or loop.

14. What is the purpose of the catch block in a try-catch statement?

  • It defines the code to be executed if the try block encounters an error or exception.
  • It defines the code to be executed if a specific condition is met.
  • It defines the code to be executed unconditionally after the try block.
  • It defines the code to be executed before the try block.

15. Which method is used to remove an element from the DOM using JavaScript?

  • removeChild()
  • deleteElement()
  • removeElement()
  • detachElement()

16. What is the purpose of the load event in AJAX?

  • It is triggered when an error occurs during the AJAX request.
  • It is triggered when the response from the AJAX request is received.
  • It is triggered when the AJAX request is sent.
  • It is triggered when the DOM is fully loaded and parsed.

17. Which statement is used to throw a custom error or exception in JavaScript?

  • raiseError()
  • throwException()
  • throwError()
  • throw

18. What is the purpose of the finally block in a try-catch statement?

  • It defines the code to be executed if the try block encounters an error or exception.
  • It defines the code to be executed if a specific condition is met.
  • It defines the code to be executed unconditionally after the try block.
  • It defines the code to be executed regardless of whether an error or exception occurred.

19. Which method is used to handle AJAX errors in JavaScript?

  • handleError()
  • onerror()
  • catchError()
  • onreadystatechange()

20. Which method is used to add an event listener to an element in JavaScript?

  • attachEvent()
  • addEventListener()
  • bindEvent()
  • bindListener()

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

  • It is used to prevent the default behavior of an event.
  • It is used to prevent the execution of a function.
  • It is used to prevent the propagation of an event.
  • It is used to prevent the bubbling of an event.

22. Which statement is used to define a JavaScript function?

  • createFunction()
  • defineFunction()
  • function
  • newFunction()

23. What is the scope of a variable declared inside a function in JavaScript?

  • Global scope
  • Function scope
  • Block scope
  • Window scope

24. What is the purpose of the return statement in a JavaScript function?

  • It is used to terminate the execution of a function and return a value.
  • It is used to define the input parameters of a function.
  • It is used to assign a value to a variable within a function.
  • It is used to catch and handle errors or exceptions in a function.

25. What is the purpose of the getElementById() method in JavaScript?

  • It is used to get the value of an input element.
  • It is used to get the text content of an HTML element.
  • It is used to get a reference to an HTML element based on its ID.
  • It is used to get the class name of an HTML element.

26. What is the purpose of the innerHTML property in JavaScript?

  • It is used to retrieve the CSS styles applied to an element.
  • It is used to modify the ID of an HTML element.
  • It is used to get or set the HTML content within an element.
  • It is used to retrieve the value of an input element.

27. What is the purpose of the catch block in a try-catch-finally statement?

  • It defines the code to be executed if the try block encounters an error or exception.
  • It defines the code to be executed if the finally block encounters an error or exception.
  • It defines the code to be executed unconditionally after the try block.
  • It defines the code to be executed before the try block.

28. Which method is used to add a CSS class to an HTML element using JavaScript?

  • addStyleClass()
  • setClass()
  • modifyClass()
  • classList.add()

29. What is the purpose of the throw statement in JavaScript?

  • It is used to terminate the execution of a function or loop.
  • It is used to define a custom error message.
  • It is used to catch and handle errors or exceptions.
  • It is used to throw a user-defined error or exception.

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