JavaScript Error Handling

Explore exceptions,try-catch blocks,and debugging best practices.

1. What is the correct syntax to handle errors in JavaScript?

try...catch try...handle catch...try error...handle

2. Which block is used to enclose code that might throw an error?

try catch finally throw

3. Which error type occurs when accessing an undefined variable?

SyntaxError ReferenceError TypeError RangeError

4. Which block handles errors thrown in the try block?

try catch finally throw

5. What happens if an error is thrown in a try block with no catch block?

The script continues execution The error is ignored The script stops executing The finally block runs immediately

6. Which property of an error object contains the error message?

msg message text description

7. What is the output of: try { throw 'oops'; } catch(e) { console.log(e); } finally { console.log('done'); }

'oops' then 'done' 'done' then 'oops' 'oops' only 'done' only

8. Which error is thrown when a value is not of the expected type (e.g., calling a string as a function)?

SyntaxError ReferenceError TypeError EvalError

9. Which of the following are valid error-handling constructs in JavaScript?

try...catch try...finally catch...finally try...catch...finally

10. What can be thrown using the 'throw' statement?

An Error object A string A number A boolean

11. Which are built-in error types in JavaScript?

Error SyntaxError CustomError ReferenceError

12. Which properties do standard Error objects have?

name message stack code

13. How can you handle errors with async/await?

try...catch around await .catch() method on the promise throw statement inside async function try...handle block

14. The finally block is optional in a try/catch structure.

True False

15. try...catch can only handle errors in synchronous code.

True False

16. Throwing an error stops execution of the current function.

True False

17. The Error constructor requires a message parameter.

True False

18. What keyword defines a block that executes after try/catch, regardless of errors?

19. What property of an Error object returns a string representing the call stack trace?

20. Name the error type thrown when a number is outside the allowable range (e.g., new Array(-1)).

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