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A fully updated 2025 JavaScript-Developer-I Exam Dumps exam guide from training expert Prep4sureGuide
NEW QUESTION # 82
Refer to the following code:
What is returned by the function call on line 13?
- A. Undefined
- B. Line 13 throws an error.
- C. Undefined value.
- D. Null value
Answer: B
NEW QUESTION # 83
Refer to the following code:
What is the output of line 11?
- A. [1,2]
- B. ["foo", "bar"]
- C. ["bar", "foo"]
- D. ["foo:1", "bar:2"]
Answer: B
NEW QUESTION # 84
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boot time with an event?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option D
- D. Option A
Answer: B
NEW QUESTION # 85
Refer to the code below:
What are the value of objBook and newObBook respectively?
- A. ( author: ''Robert'', title JavaScript'' )
( author: ''Robert'', title JavaScript'' ) - B. (author: ''Robert'' )
(Author: ''Robert '', title: JavaScript'') - C. ( Title: JavaScript'')
( Title: JavaScript'') - D. author: ''Robert title ''javaScript'' ) undefined
Answer: D
NEW QUESTION # 86
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
- A. Change line 7 to ) () ;
- B. Change line 5 to function world ( ) {
- C. Change line 2 to console.log('Hello' , name() );
- D. Change line 9 to sayHello(world) ();
Answer: C
NEW QUESTION # 87
Refer to the code below:
const event = new CustomEvent(
//Missing Code
);
obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options could a developer insert at the placeholder in line 02 to achieve this?
Choose 2 answers
- A. { type : 'update', recordId : '123abc' }
- B. 'Update' , (
recordId : '123abc'
( - C. 'Update' , '123abc'
- D. 'Update' , {
Details : {
recordId : '123abc'
}
}
Answer: B,D
NEW QUESTION # 88
A class was written to represent items for purchase in an online store, and a second class representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in. The pseudocode is below:
There is a new requirement for a developer to implement a description method that will retrun a brief description for item and saleitem.
What is the out when executing the code above?
- A. This is a Scaf
Uncaught TypeError: saleItem, description is not a function
This is a Shirt
This is a discounted Shirt - B. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt - C. This is a Scarf
This is a Shirt
This is a discounted Scard
This is a discounted Shirt - D. This is a Scarf
Unicaught TypeError: saleitem, description is not a function
This is a Scarf
This is a discounted Shirt
Answer: B
NEW QUESTION # 89
A developer has a server running with Node.js. the command to start the web server is node server.js. the server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?
- A. DEBUO=true node server,js
- B. NODE_DEBUO=http, https node server,js
- C. NODE_DEBUO=true node server,js
- D. DEBUO=http, https node server,js
Answer: D
NEW QUESTION # 90
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. canTalk
- B. Type
- C. Owner
- D. Size
- E. Name
Answer: A,B,D
NEW QUESTION # 91
A developer wants to use a module named universalContainersLib and then call functions from it.
How should a developer import every function from the module and then call the functions foo and bar?
- A. import * from '/path/universalContainersLib.js';
universalContainersLib. foo ()7
universalContainersLib.bar (); - B. import * as lib from '/path/universalContainersLib.js';
lib.foo();
lib. bar (); - C. import all from '/path/universalContainersLib.js';
universalContainersLib.foo();
universalContainersLib.bar (); - D. import {foo,bar} from '/path/universalCcontainersLib.js';
foo():
bar()?
Answer: B
NEW QUESTION # 92
Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.
UC is thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?
- A. Private registries are not supported by npm, but packages can be installed via git.
- B. Private registries are not supported by npm, but packages can be installed via URL.
- C. Private packages can be scored, and scopes can be associated to a private registries.
- D. Private packages are not supported, but they can use another package manager like yarn.
Answer: C
NEW QUESTION # 93
Refer to the following code:
<html lang="en">
<body>
<div onclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?
- A. Inner message
Outer message - B. Inner message
- C. Outer message
Inner message - D. Outer message
Answer: B
NEW QUESTION # 94
A developer implements a function that adds a few values.
Which three options can the developer invoke for this function to get a return vale of 10? Choose 3 answers
- A. Sum () (5, 5)
- B. Sum (5) (5)
- C. Sum () (10)
- D. Sum (10) ()
- E. Sum (5, 5) ()
Answer: A,B,C
NEW QUESTION # 95
A developer receives a comment from the Tech lead that the code below gives an error.
Which line edit should be made to make this code run?
- A. 02 const year = 2020;
- B. 01 let monthname = 'July ';
- C. 03 if (year == 2019) (
- D. 02 let year = 2019 ;
Answer: A
NEW QUESTION # 96
Cloud Kicks has a class to represent item for sale in an online store, as shown below:
A new business requirement comes in that request a clothingitem class, that should have all of the properties and methods of the item class, but will also have properties that are specific top clothes.
Which line of code properly declares the clothingitem class such that it inherits from item?
- A. Class clothing item super item (
- B. Class Clothingitem (
- C. Class clothingitem extends item (
- D. Class clothingitem implements item (
Answer: C
NEW QUESTION # 97
A developer has the function, shown below, that is called when a page loads.
Where can the developer see the log statement after loading the page in the browser?
- A. On the browser JavaScript console
- B. In the browser performance tools log
- C. On the terminal console running the web server
- D. On the webpage console log
Answer: A
NEW QUESTION # 98
Refer to the following code:
<html lang="en">
<body>
<divonclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?
- A. Inner message
- B. Outer message
- C. Inner messageOuter message
- D. Outer messageInner message
Answer: A
NEW QUESTION # 99
Universal Containers recently its new landing page to host crowd-function campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, It creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below.
All the elements included the same ad-library-item class. They are hidden by default, and they are randomly displayed while the user navigation through the page.
Tired of all the ads, what can the developer do to temporarily and quickly remove them?
- A. Use the browser console to execute a script that prevents the load event to be fired.
- B. Use the DOM inspector to prevent the load event to be fired.
- C. Use the browser console to execute a script that removes all the elements containing the class ad-library-item.
- D. Use the DOM inspector to remove all the elements containing the call ad-library -item.
Answer: C
NEW QUESTION # 100
Given the code below:
Which three code segments result in a correct conversion from number to string? Choose 3 answers
- A. let strValue = * * 4 numValue;
- B. let scrValue = String(numValue);
- C. let strValue = numValue. toString();
- D. let strValue = (String)numValue;
- E. let strValue = numValue.toText ();
Answer: A,B,C
NEW QUESTION # 101
A developer implements and calls the following code when an application state change occurs:
Const onStateChange =innerPageState) => {
window.history.pushState(newPageState, ' ', null);
}
If the back button is clicked after this method is executed, what can a developer expect?
- A. A popstate event is fired with a state property that details the application's last state.
- B. A navigate event is fired with a state property that details the previous application state.
- C. The page is navigated away from and the previous page in the browser's history is loaded.
- D. The page reloads and all Javascript is reinitialized.
Answer: C
NEW QUESTION # 102
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
- A. May 10, 2020
- B. October 05, 2020
- C. November 05, 2020
- D. June 10, 2020
Answer: A
NEW QUESTION # 103
A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed time a user clicks the button instead of just the first time.
Which two code lines make this code work as required? Choose 2 answers
- A. On line 04, use event .stopPropagetion ( );
- B. On line 04, use button. removeEventlistener ('click', listen );
- C. On line 02, use event.first to test if it is the first execution.
- D. On line 06, ad an option called once to button. addEventlistener ( ).
Answer: B,D
NEW QUESTION # 104
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