Mar-2026 Realistic JavaScript-Developer-I Accurate & Verified Answers As Experienced in the Actual Test!
Latest Salesforce JavaScript-Developer-I Practice Test Questions, Salesforce Certified JavaScript Developer I Exam Exam Dumps
Salesforce JavaScript-Developer-I Certification Exam covers a variety of topics related to the development of custom applications on the Salesforce platform using JavaScript. These topics include but are not limited to data modeling, server-side development, client-side development, security, testing, and deployment. JavaScript-Developer-I exam also covers the use of Lightning Web Components, Aura Components, and other Salesforce development tools and technologies.
NEW QUESTION # 20
Refer to code below:
console.log(0);
setTimeout(() => (
console.log(1);
});
console.log(2);
setTimeout(() => {
console.log(3);
), 0);
console.log(4);
In which sequence will the numbers be logged?
- A. 0
- B. 02413
- C. 01234
- D. 02431
Answer: D
NEW QUESTION # 21
Refer to the string below:
const str = 'Salesforce';
Which two statements result in the word 'Sales'?
Choose 2 answers
- A. str.substring (1, 5);
- B. str.substr(1, 5);
- C. str.substring (0, 5);
- D. str.substr (0, 5);
Answer: C,D
NEW QUESTION # 22
Refer to the code below:
Which value can a developer expect when referencing country,capital,cityString?
- A. An error
- B. undefined
- C. 'London'
- D. 'NaN'
Answer: D
NEW QUESTION # 23
Given the following code, what is the value of x?
let x = '15' + (10 * 2);
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 24
developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:
- A. Performs a static analysis on code before execution to look for runtime errors.
- B. Ensures stability with one major release every few years.
- C. Executes server-side JavaScript code to avoid learning a new language.
- D. I nstalls with its own package manager to install and manage third-party libraries.
- E. User non blocking functionality for performant request handling .
Answer: A,D,E
NEW QUESTION # 25
A developer has the following array of hourly wages:
Let arr = (8, 5, 9, 75, 11, 25, 7, 75, , 13, 25);
For workers making less than $10 an hour rate should be multiple by 1.25 and returned in a new array.
How should the developer implement the request?
- A. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
- B. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );
- C. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
- D. let arrl = arr.filter((val) => val < 10).map((num) -> num = 1.25);
Answer: A
NEW QUESTION # 26
Refer to the HTML below:
Which JavaScript statement results in changing " The Lion."?
- A. document.querySelector('$main li:second-child').innerHTML = "The Lion ';
- B. document.querySelector('$main li.Tony').innerHTML = '" The Lion ';
- C. document.querySelector('$main li:nth-child(2)'),innerHTML = " The Lion. ';
- D. document.querySelectorAll('$main $TONY').innerHTML = '" The Lion
Answer: D
NEW QUESTION # 27
Which statement can a developer apply to increment the browser's navigation history without a page refesh?
- A. Window.history,pushState.(newStateObject);
- B. Window.history,state,push.(newStateObject, ' ' null;
- C. Window.history,pushState.(newStateObject, ' ', null)) ;
- D. Window.history,state,push.(newStateObject);
Answer: B
NEW QUESTION # 28
Refer to the following code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without
error?
Choose 2 answers
- A. // FooUtils.js and BarUtils.js exist
Import (foo) from '/path/FooUtils.js';
Import (boo) from ' /path/NarUtils.js'; - B. const foo = () => { return 'foo';}
const bar = () => {return 'bar'; }
Export default foo, bar; - C. const foo = () => { return 'foo' ; }
const bar = () => { return 'bar' ; }
export { bar, foo } - D. Export default class {
foo() { return 'foo' ; }
bar() { return 'bar' ; }
}
Answer: C,D
NEW QUESTION # 29
Refer to the code below:
Which code change should be made for the console to log only Row log when 'Click mel' is clicking?
- A. Add event,stopPropagation (); to printMessage function.
- B. Add event,stopPropagation (); to window.onLoad event hadler.
- C. Add event,stopPropagation (); to printMessage function.
- D. Add event,stopPropagation (); to window,onLoad event hadler.
Answer: B,C
NEW QUESTION # 30
Refer to the code below:
const addBy = ?
const addByEight =addBy(8);
const sum = addBYEight(50);
Which two functions can replace line 01 and return 58 to sum?
Choose 2 answers
- A. const addBY = (num1) => (num2) => num1 + num2;
- B. const addBy = function(num1){
return num1 + num2;
} - C. const addBy = function(num1){
return function(num2){
return num1 + num2;
} - D. const addBy = (num1) => num1 + num2 ;
Answer: A,C
NEW QUESTION # 31
Refer to the code below:
Which two function can replace line 01 and return 58 to sum? Choose 2 answers
- A. const addBy = (num1) num1 + num2
- B. Const addby = function (num1) (
Return function (num2) (
}
} - C. const addBy = num1 (num2) => num1 + num2 ;
- D. const addBy = function (num1) {
Return function (num2) {
}
}
Answer: C,D
NEW QUESTION # 32
Given the following code:
Let x = ('15' +10) +2;
What is the value of x?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: C
NEW QUESTION # 33
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?
- A. Undefined
- B. Line 13 throws an error.
- C. 'Null value!'
- D. 'Undefined values!'
Answer: D
NEW QUESTION # 34
A developer wants to set up a secure web server with Node.js. The developer create a directory locally called app-server, and the first file is app-server/index, js.
Without using any third-party libraries, what should the developer add to index, js to create the secure web server?
- A. Const server = require ( 'secure-server') ;
- B. Const tls = require ('tls') ;
- C. Const http = require ('http');
- D. Const http = require ('https') ;
Answer: D
NEW QUESTION # 35
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. On the browser JavaScript console
- C. In the browser performance tools log
- D. On the webpage console log
Answer: B
NEW QUESTION # 36
Universal Containers recently launched its new landing page to host a crowd-funding 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 includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the DOM inspector to prevent the load event to be fired.
- B. Use the DOM inspector to remove all the elements containing the class ad-library-item.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the browser to execute a script that removes all the element containing the class ad-library-item.
Answer: D
NEW QUESTION # 37 
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. Change line 10 to event.stopPropagation (false) ;
- C. Remove line 10
- D. Change line 14 to elem.addEventListener ('click', printMessage, true);
Answer: C
NEW QUESTION # 38
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