JavaScript-Developer-I Exam Preparation Material with New JavaScript-Developer-I Dumps Questions
JavaScript-Developer-I 2024 Training With 223 QA's
Salesforce JavaScript-Developer-I Certification Exam is designed for developers who have a strong foundation in JavaScript and are looking to specialize in Salesforce development. JavaScript-Developer-I exam measures the candidate's knowledge of Salesforce development concepts, including Apex, Visualforce, and Lightning Components, as well as their proficiency in JavaScript programming. Salesforce Certified JavaScript Developer I Exam certification is intended to demonstrate the candidate's ability to design, develop and test custom applications on the Salesforce platform.
Salesforce JavaScript-Developer-I is a certification exam designed for professionals who want to demonstrate their expertise in using JavaScript and related technologies to develop custom applications on the Salesforce platform. JavaScript-Developer-I exam measures the candidate's knowledge of the fundamental concepts of JavaScript, including data types, control structures, functions, arrays, and objects, as well as their ability to apply this knowledge to solve real-world programming problems.
The Salesforce JavaScript-Developer-I exam covers a wide range of topics, including the fundamentals of JavaScript, the use of JavaScript in the Salesforce platform, and best practices for developing and testing JavaScript code. It also evaluates the candidate's understanding of the Salesforce platform, including its architecture, security and data model, and its integration with other technologies. Passing the Salesforce JavaScript-Developer-I exam demonstrates that the candidate has a deep understanding of JavaScript and its application in the Salesforce platform, and is capable of developing high-quality, scalable, and efficient custom applications in Salesforce.
NEW QUESTION # 45
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 boost with an event?
- A. Server.on ('error', (error) => {
console.log('ERROR', error);
}); - B. Try{
server.start();
} catch(error) {
console.log('ERROR', error);
} - C. Server.catch ((server) => {
console.log('ERROR', error);
}); - D. Server.error ((server) => {
console.log('ERROR', error);
});
Answer: A
NEW QUESTION # 46
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?
- A. Class ClothingItem super Item {
- B. Class ClothingItem {
- C. Class ClothingItem extends Item {
- D. Class ClothingItem implements Item{
Answer: C
NEW QUESTION # 47 
Which code change should be done for the console to log the following when 'Click me!' is clicked'
> Row log
> Table log
- A. Remove lines 13 and 14
- B. Remove line 10
- C. Change line 10 to event.stopPropagation (false) ;
- D. Change line 14 to elem.addEventListener ('click', printMessage, true);
Answer: B
NEW QUESTION # 48
Refer to the following code:
Let sampleText = 'The quick brown fox jumps';
A developer needs to determine if a certain substring is part of a string.
Which three expressions return true for the given substring ?
Choose 3 answers
- A. sampleText.includes(' Fox ', 3)
- B. sampleText.includes(' quick ') !== -1;
- C. sampleText.includes('fox');
- D. sampleText.includes(' fox ');
- E. sampleText.includes(' quick ', 4);
Answer: B,D,E
NEW QUESTION # 49
Which two options are core Node.js modules?
Choose 2 answers
- A. http
- B. exception
- C. isotream
- D. worker
Answer: A,C
NEW QUESTION # 50
A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students
who scored more than 15 points.
How should the developer implement the request?
- A. Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))
- B. Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
- C. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));
- D. Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
Answer: D
NEW QUESTION # 51
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 ?
- A. Returns NaN
- B. Returns 0
- C. Returns 10
- D. Throws an error
Answer: C
NEW QUESTION # 52
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. > 5 >undefined
- B. > 5 > -1
- C. > true > false
- D. > 5 > 0
Answer: A
Explanation:
NEW QUESTION # 53
Refer to the code snippet below:
Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++)
if (array[i] === 4) {
array.splice(i, 1);
}
}
What is the value of array after the code executes?
- A. [1, 2, 3, 4, 5, 4]
- B. [1, 2, 3, 4, 4, 5, 4]
- C. [1, 2, 3, 5]
- D. [1, 2, 3, 4, 5, 4, 4]
Answer: B
NEW QUESTION # 54
A developer implements a function that adds a few values.
Function sum(num) {
If (num == undefined) {
Num =0;
}
Return function( num2, num3){
If (num3 === undefined) {
Num3 =0 ;
}
Return num + num2 + num3;
}
}
Which three options can the developer invoke for this function to get a return value of 10 ?
Choose 3 answers
- A. Sum (5, 5) ()
- B. sum(5)(5)
- C. sum() (5, 5)
- D. Sum () (20)
- E. sum(10) ()
Answer: B,C
NEW QUESTION # 55
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. > 5 >undefined
- B. > 5 > -1
- C. > true > false
- D. > 5 > 0
Answer: A
Explanation:
NEW QUESTION # 56
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:
- A. Primitive values are mutable.
- B. Non-primitive values are mutable.
- C. Non-primitive values are immutable.
- D. Primitive values are immutable.
Answer: D
NEW QUESTION # 57
Refer to the code below:
What are the value of objBook and newObBook respectively?
- A. (author: ''Robert'' )
(Author: ''Robert '', title: JavaScript'') - B. author: ''Robert title ''javaScript'' ) undefined
- C. ( Title: JavaScript'')
( Title: JavaScript'') - D. ( author: ''Robert'', title JavaScript'' )
( author: ''Robert'', title JavaScript'' )
Answer: B
NEW QUESTION # 58
Refer to the code below:
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', {
Detail ; {
recordId, '123abc
)
) - C. 'update' , '123abc'
- D. 'update', ( recordId ; 123abc'
)
Answer: B,D
NEW QUESTION # 59
A developer creates an object where its properties should be immutable and prevent
properties from being added or modified.
Which method should be used to execute this business requirement ?
- A. Object.eval()
- B. Object.lock()
- C. Object.freeze()
- D. Object.const()
Answer: C
NEW QUESTION # 60
Given the code below:
const delay = sync delay => {
Return new Promise((resolve, reject) => {
setTimeout (resolve, delay);});};
const callDelay =async () =>{
const yup =await delay(1000);
console.log(1);
What is logged to the console?
- A. 1 2 3
- B. 2 3 1
- C. 1 3 2
- D. 2 1 3
Answer: B
NEW QUESTION # 61
Refer to the code below:
What is the value of result when the code executes?
- A. 10 - 10
- B. 10 - 5
- C. 5 - 10
- D. 5 - 5
Answer: A
NEW QUESTION # 62
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. The imported library uses events and
callbacks to start the servers
Which code should be inserted at the line 03 to set up an event and start the web server ?
- A. server()
- B. console.log( 'Listening on ', port) ;
- C. Server.start ();
- D. serve(( port) => (
- E. server.on(' connect ' , ( port) => {
console.log('Listening on ' , port) ;})
Answer: E
NEW QUESTION # 63
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 terminal console running the web server
- B. In the browser performance tools log
- C. On the browser JavaScript console
- D. On the webpage console log
Answer: C
NEW QUESTION # 64
Which three actions can be done using the JavaSript browser console?
Choose 3 answer
- A. View and change the DOM of the page.
- B. View and change security cookies
- C. Display a report showing the performance of a page.
- D. View, change, and debug the JavaScript code of the page.
- E. Run code a that is not related to the page.
Answer: A,D,E
NEW QUESTION # 65
Given the code below:
const copy = JSON.stringify([ new String(' false '), new Bollean( false ), undefined ]); What is the value of copy?
- A. -- [ \"false\" , { } ]--
- B. -- [ false, { } ]--
- C. -- [ \"false\" , false, undefined ]--
- D. -- [ \"false\" ,false, null ]--
Answer: D
NEW QUESTION # 66
A developer at Universal Containers is creating their new landing page basedon HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage is fully loaded (HTML content and all related files), in order to do some custom initializations.
Which implementation should be used to call Fe:s:-a;::eHec5;te::.-.ter.: based on the business requirement above?
- A. Add a listener to thewindow object to handle the DOMContentLoaded event
- B. Add a listener to the window object to handle the lead event
- C. Add a handler to the personalizeWebsiteContent script to handlethe load event
- D. Add a handler to the personalizeWebsiteContent script tohandle the DOMContentLoaded event
Answer: B
NEW QUESTION # 67
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?
- A. Console,trace ( )
- B. Console.getTime ( )
- C. Console, timestamp
- D. Console.timeLog ( )
Answer: B
NEW QUESTION # 68
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