JavaScript-Developer-I Practice Test

Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?

A.

“Null”

B.

“X”

C.

“Object”

D.

“undefined”

A developer wants to use a try...catch statement to catch any error that countSheep () may
throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?

A.

Option

B.

Option

C.

Option

D.

Option

A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm
install.
Which two reasons could be possible explanations for this?
Choose 2 answers

A.

The developer missed the option --add when adding the dependency.

B.

The developer added the dependency as a dev dependency, and
NODE_ENV Is set to production.

C.

The developer missed the option --save when adding the dependency.

D.

The developer added the dependency as a dev dependency, and
NODE_ENV is set to production.

Refer to the HTML below:
<div id=”main”>
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing “ Tony” to “Mr. T.”?

A.

document.querySelectorAll(‘$main $TONY’).innerHTML = ’ Mr. T. ’;

B.

document.querySelector(‘$main li:second-child’).innerHTML = ’ Mr. T. ’;

C.

document.querySelector(‘$main li.Tony’).innerHTML = ’ Mr. T. ’;

D.

document.querySelector(‘$main li:nth-child(2)’),innerHTML = ’ Mr. T. ’;

Refer to the code below:
Const searchTest = ‘Yay! Salesforce is amazing!” ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A.

> true > false B. > 5 >undefined

B.

> 5 > -1

C.

> 5 > 0