[Q29-Q49] Accurate & Verified 2025 New JavaScript-Developer-I Answers As Experienced in the Actual Test!

Q29. Refer to the code:

Given the code above, which three properties are set for pet1? Choose 3 answers

Q30. Given the code below:

What is the expected output?

Q31. Refer to code below:
function Person() {
this.firstName = ‘John’;
}
Person.prototype ={
Job: x => ‘Developer’
};
const myFather = new Person();
const result =myFather.firstName + ‘ ‘ + myFather.job();
What is the value of the result after line 10 executes?

Q32. Given the code below:

What is logged to the console’

Q33. 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?

Q34. Refer to the code below:
01 const server = require(‘server’);
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Whichcode should be inserted at the line 03 to set up an event and start the web server ?

Q35. Which function should a developer use to repeatedly execute code at a fixed time interval?

Q36. 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?

Q37. A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.

When the code execution stops at the breakpoint on line 06, which two types of information are available In the browser console? Choose 2 answers

Q38. Refer to the code below:

Which statement allows a developer to cancel the scheduled timed function?

Q39. Refer to the following code:
Let obj ={
Foo: 1,
Bar: 2
}
Let output =[],
for(let something in obj{
output.push(something);
}
console.log(output);
What is the output line 11?

Q40. A developer is wondering whether to use, promise, then or provise, catch especially when a promise throws an error.
Which two promises are rejected? Choose 2 answers

Q41. Which code statement below correctly persists an objects inlocal Storage ?

Q42. Refer to the following code block:

What is the console output?

Q43. Which statement parses successfully?

Q44. Refer to the code below:
Let str = ‘javascript’;
Str[0] = ‘J’;
Str[4] = ‘S’;
After changing the string index values, the value of str is ‘javascript’. What is the reason for this value:

Q45. Refer to the code below:

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

Q46. Given the following code:

is the output of line 02?

Q47. Given the code below:

What is logged to the console’

Q48. A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

Q49. What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers