Error Handling and Debugging

This section explores Error Handling and Debugging in JavaScript, focusing on try-catch, finally, custom errors, console methods, and debugging tools for effective problem resolution.

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Question 1

What is the purpose of the try...catch block in JavaScript?

  • To handle asynchronous code

  • To handle errors during code execution

  • To stop the execution of a program

  • To skip specific lines of code

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Question 2

Which statement is used to manually throw an error in JavaScript?

  • throw

  • raise

  • error

  • reject

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Question 3

What is the Error object used for?

  • To create custom error messages

  • To debug code by printing logs

  • To represent runtime errors in JavaScript

  • To pause code execution

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Question 4

What is the output of the following code?

JavaScript 
try {
    console.log(a);
} catch (e) {
    console.log(e.message);
}


  • a is not defined

  • ReferenceError: a is not defined

  • Undefined

  • Throws no error

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Question 5

Which console method is used to display a table of data?

  • console.log()

  • console.error()

  • console.data()

  • console.table()

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Question 6

What happens if there is no catch block for a thrown error?

  • The program continues execution

  • The error is ignored

  • The program crashes or stops execution

  • A warning is displayed in the console

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Question 7

Which of the following methods halts the browser's execution to inspect the code?

  • debugger

  • console.stop()

  • break()

  • console.inspect()

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Question 8

What is the purpose of the finally block in error handling?

  • Executes only if an error occurs


  • Executes only if no error occurs

  • Executes after the try and catch blocks, regardless of errors

  • Stops the error from propagating further

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Question 9

Which of the following is NOT a console method?

  • console.time()

  • console.warn()

  • console.info()

  • console.alert()

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Question 10

What is the primary advantage of using a linter like ESLint in debugging?

  • Automatically fixes all errors in code

  • Highlights potential errors and enforces coding standards

  • Pauses execution of the code

  • Provides runtime debugging tools

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