Testing and Debugging JavaScript Programming Quiz

1. What is the first step in debugging JavaScript code?

• Understand the Problem
• Skip to Testing
• Ask for Help
• Change the Code

2. What technique involves dividing the problem into smaller parts to solve it?

• Split and Fix
• Break and Solve
• Analyze and Repair
• Divide and Conquer

3. Which tool is primarily used to inspect variables in JavaScript?

• Database Management System
• Text Editor
• Command Line Interface
• Browser Developer Tools

4. What is the purpose of assertions in unit tests for JavaScript?

• To ensure the code behaves as expected
• To slow down the execution of the code
• To avoid handling errors during runtime
• To generate random values for testing

5. How can you review error messages in JavaScript?

• By writing console.error in every function
• By using the alert() function to display messages
• By examining the console output and stack trace logs
• By checking JavaScript files for syntax errors manually

6. Which function prints messages to the console in JavaScript?

• print.console()
• log.output()
• echo.message()
• console.log()

7. How do you set a breakpoint in JavaScript code?

• By using an alert statement before the line
• By clicking on the line number in the Sources panel of the developer tools
• By writing `breakpoint` in the code
• By adding a comment above the line of code

8. What is the role of try…catch blocks in error handling?

• To automatically fix all coding mistakes
• To convert errors into warnings
• To catch and handle runtime errors
• To ignore errors and continue execution

9. How is the debugger statement utilized in JavaScript?

• By commenting out the code
• By running the code in an alert box
• By invoking the browser’s debugger tool
• By using console.log() exclusively

10. What is the typical approach to using developer tools for debugging?

• Write down error messages and ignore code context
• Open developer tools, navigate to Sources panel, set breakpoint, refresh webpage, and inspect variables
• Remove all code and start from scratch
• Run the code without checking for errors

11. What is the correct syntax for using console.log() in JavaScript?

• console.log(`message`);
• console.log[](`message`);
• console.log.message(`message`);
• log.console(`message`);

12. How can console.log() help identify bugs in your JavaScript code?

• By printing out messages or checking variable values
• By running the code on a different platform
• By hiding error messages from the user
• By creating random variables in the code

13. What are conditional breakpoints used for in debugging?

• To pause execution only when a specific condition is met
• To permanently stop the program from running
• To record all variable values during execution
• To continue execution without interruptions

14. How do you create a conditional breakpoint in JavaScript?

• By stopping the execution after every line of code
• By adding comments in the code to pause execution
• By using the debugger statement in your code
• By specifying a condition in the breakpoint settings

15. Why is setting breakpoints on event listeners beneficial?

• To automatically correct any bugs in the code
• To eliminate all potential errors in the code
• To speed up the processing of the event listeners
• To pause code execution and examine the state of the program at a specific moment

16. How do you apply a breakpoint on an event listener in JavaScript?

• By adding a debug flag in the event listener function
• By using console.log() to observe event triggers
• By clicking the Sources tab, expanding the event listener, and setting a breakpoint
• By changing the event listener to pause on click

17. What controls does the Chrome debugger provide for navigating code?

• Step, Step Over, Step Into, Out, and Resume
• Debug, Trace, Analyze, Skip, and Pause
• Run, Launch, Edit, Stop, and Execute
• Log, Print, Save, Exit, and Return

18. What function does the Step control serve in the Chrome debugger?

• It allows you to jump to the end of the script immediately.
• It enables you to step through line by line as the JavaScript code executes.
• It pauses the execution indefinitely.
• It skips over lines without executing them.

19. How does the Step Over control work in the Chrome debugger?

• It steps into a function call to examine details.
• It executes a function without stepping into it.
• It resumes code execution after pausing.
• It allows you to skip past a line of code entirely.

20. What is the purpose of the Step Into control in debugging?

• It skips the function and moves to the next line
• It stops the debugging session altogether
• It exits the entire program immediately
• It steps into a function call and executes it line by line

21. What does the Step Out control do in the Chrome debugger?

• It steps out of a function call after executing it line by line.
• It executes a function without stepping into it.
• It resumes execution of the code from the current breakpoint.
• It enables you to step through line by line as the JavaScript code executes.

22. What action does the Resume control perform in code execution?

• It saves the current state of the code execution
• It skips the current line and moves to the next
• It resumes execution of the code from the current breakpoint
• It stops execution and resets the code

23. How can you log and analyze data during debugging in JavaScript?

• By storing data in localStorage and retrieving it later
• By using console.log() to print out data and examining it in the console
• By using alert() to show data in pop-ups during execution
• By writing data directly to the HTML document with document.write()

24. Why is consulting documentation important in debugging?

• To distract from the main issues in the code
• To add unnecessary complexity to the process
• To eliminate the need for testing and error checking
• To find solutions to specific problems and understand how to use debugging tools

25. How can code isolation aid in debugging?

• By avoiding any interaction with debugging tools
• By combining different code sections into a single block
• By making all code run simultaneously for performance
• By isolating parts of the code to test them individually

26. What advantage does seeking fresh perspectives provide in debugging?

• To work faster without checking details
• To ignore feedback and stick to original solutions
• To get new insights and approaches to solving the problem
• To ensure all team members make the same mistakes

27. How can assertions be effectively used in debugging JavaScript?

• By minimizing the size of the code to avoid errors
• By commenting out all the code and re-running it
• By adding statements that check for certain conditions and throw errors if they are not met
• By running multiple copies of the same function

28. What role do unit tests play in the debugging process?

• To ensure that individual units of code behave as expected
• To improve code readability and maintainability
• To compile the entire project into a final executable
• To document the development process for future reference

29. How can you identify and fix bugs through testing in JavaScript?

• By reading through requirements, identifying bugs, and making iterative changes to fix them
• By solely relying on third-party libraries for solutions
• By ignoring error messages and testing only manually
• By rewriting the entire code from scratch

30. What are the critical skills assessed by the JavaScript debugging skills test?

• Analyze design patterns, enhance styling, create unit tests, and maximize speed
• Write comments, compile code, optimize performance, and avoid errors
• Review project requirements, conduct user testing, manage versions, and refactor code
• Identify bugs, understand the code’s main function, fix bugs, and find solutions within a time limit