JavaScript-Developer-I Free Practice Test

Given HTML below:

Which statement adds the priority = account CSS class to the universal COntainers row ?

1. A. Document.querySelector(‘#row-uc’).classes.push(‘priority-account’);
2. B. Document .queryElementById(‘row-uc’).addclass(‘priority-account’);
3. C. Document .querySelector(‘#row-uc’).classList.add(‘priority-account’);
4. D. Document .querySelectorALL(‘#row-uc’).classList.add(‘priority-account’);

Correct Answer: B

At Universal Containers, every team has its own way of copyingJavaScript objects. The code
Snippet shows an implementation from one team:

What is the Output of the code execution?

1. A. Hello Dan Doe
2. B. Hello John DOe
3. C. TypeError: dan.name is not a function
4. D. TypeError: Assignment to constant variable.

Correct Answer: C

In which situation should a developer include a try .. catch block around their function call ?

1. A. The function has an error that shouldnot be silenced.
2. B. The function results in an out of memory issue.
3. C. The function might raise a runtime error that needs to be handled.
4. D. The function contains scheduled code.

Correct Answer: C

Given the JavaScript below:
1 function filterDOM (searchString) {
2 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(‘ .account’ ) . forEach(account => (
04 const accountName = account[removed].toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match thesearch string?

1. A. ‘ name ’ : ‘ block ’
2. B. ‘ Block ’ : ‘ none ’
3. C. ‘ visible ’ : ‘ hidden ’
4. D. ‘ hidden ’ : ‘ visible ’

Correct Answer: B

What is the result of the code block?

1. A. The console logs only ‘flag’.
2. B. The console logs ‘flag’ and another flag.
3. C. An error is thrown.
4. D. The console logs ‘flag’ and then an error isthrown.

Correct Answer: D