Mar 02, 2026 Newest JavaScript-Developer-I Exam Dumps – Achieve Success in Actual JavaScript-Developer-I Exam [Q15-Q31]

Q15. Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

Q16. Refer to the expression below:
Let x = (‘1’ + 2) == (6 * 2);
How should this expression be modified to ensure that evaluates to false?

Q17. A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

Q18. Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

Q19. Refer to the code below:
Const pi w 3.1415926;
What is the data type of pi?

Q20. Given the code below:

Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?

Q21. A developer uses a parsed JSON string to work with user information as in the block below:

Which two option access the email attributes in the object? Choose 2 answers

Q22. Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?

Q23. Given the following code:

What will be the first four numbers logged?

Q24. A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.

What is the value of msg when getAvailableabilityMessage (“newUserName”) is executed and get Availability (“newUserName”) returns true?

Q25. A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to theserver Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

Q26. Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?

Q27. Universal containers (UC) just launched a new landing page, but users complain that the website is slow, A developer found some functions that cause this problem, To verify this, the developer decides to execute everything and log the time each of these suspicious function consumes.

Which function can then developer use to obtain the time spent by every one of the three functions?

Q28. Given the following code:
document.body.addEventListener(‘ click ‘, (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log(‘button clicked!’);
)
});
Which replacement for the conditional statement on line 02 allows a developer to
correctly determine that a button on page is clicked?

Q29. Refer to the code below:

Considering that JavaScript is single-threaded, what is the output of line 08 after the code executes?

Q30. A developer wants to define a function log to be used a few times on a single-file JavaScript script.
01 // Line 1 replacement
02 console.log(‘”LOG:’, logInput);
03 }
Which two options can correctly replace line 01 and declare the function for use?
Choose 2 answers

Q31. A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
● Will establish a web socket connection and handle receipt of messages to the server
● Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?