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Get ready to pass your exam right away with Salesforce JavaScript-Developer-I Practice Questions. These Salesforce JavaScript-Developer-I PDFs are specially designed to make passing easier without any difficulties!

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Exam Name:
Salesforce Certified JavaScript Developer I (SP25)
Exam Code:
JavaScript-Developer-I
Questions:
219
Update Date
May 16, 2025
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Sample Questions


JavaScript-Developer-I Sample Question 1


Considering the implications of 'use strict' on line 04, which three statements describe the
execution of the code?
Choose 3 answers

A. z is equal to 3.14.
B. 'use strict' is hoisted, so it has an effect on all lines.
C. 'use strict' has an effect only on line 05.
D. 'use strict' has an effect between line 04 and theend of the file.
E. Line 05 throws an error.


ANSWER : A,C,E


JavaScript-Developer-I Sample Question 2


Given the JavaScript below:
01 function filterDOM (searchString) {
02 constparsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(‘ .account’ ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert
code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do
not match thesearch string?

A. ‘ name ’ : ‘ block ’
B. ‘ Block ’ : ‘ none ’
C. ‘ visible ’ : ‘ hidden ’
D. ‘ hidden ’ : ‘ visible ’


ANSWER : B


JavaScript-Developer-I Sample Question 3


Refer to code below:
Const objBook = {
Title: ‘Javascript’,
};
Object.preventExtensions(objBook);
Const newObjBook = objBook;
newObjectBook.author =‘Robert’;
What are the values of objBook and newObjBook respectively ?

A. [title: “javaScript”] [title: “javaScript”]
B. {author: “Robert”, title: “javaScript}Undefined
C. {author: “Robert”, title: “javaScript}{author: “Robert”, title: “javaScript}
D. {author: “Robert”}{author: “Robert”, title: “javaScript}


ANSWER : A


JavaScript-Developer-I Sample Question 4


Which option istrue about the strict mode in imported modules?

A. Add the statement use non-strict, before any other statements in the module toenablenot-strict mode.
B. You can only reference notStrict() functions from the imported module.
C. Imported modules are in strict mode whether you declare them as such or not.
D. Add the statement use strict =false; before any other statements in the module toenablenot- strict mode.


ANSWER : C


JavaScript-Developer-I Sample Question 5


Refer to the code declarations below:


Whichthree expressions return the string JavaScript?
Choose 3 answers

A. Str1.join (str2);
B. Str1.concat (str2);
C. Concat (str1, str2);
D. $(str1) $ (str2} ‘;
E. Str1 + str2;


ANSWER : B,D,E


JavaScript-Developer-I Sample Question 6


A developer receives a comment from the Tech Lead that thecode given below has
error:
const monthName = ‘July’;
const year = 2019;
if(year === 2019) {
monthName =‘June’;
}
Which line edit should be made to make this code run?

A. 01 let monthName =’July’;
B. 02 let year =2019;
C. 02 const year = 2020;
D. 03 if(year == 2019) {


ANSWER : A


JavaScript-Developer-I Sample Question 7


Refer of the string below:
Const str = ‘sa;esforce’=;
Which two statement result in the word 'Sale'?
Choose 2 answers

A. str, substring(0,5) ;
B. str, substr(0,5) ;
C. str, substring(1,5) ;
D. str, substr(1,5) ;


ANSWER : A,B


JavaScript-Developer-I Sample Question 8


Refer to the HTML below:


Which JavaScript statement results in changing “ The Lion.”?

A. document.querySelectorAll(‘$main $TONY’).innerHTML = ’“ The Lion
B. document.querySelector(‘$main li:second-child’).innerHTML = “The Lion ’;
C. document.querySelector(‘$main li.Tony’).innerHTML = ’“ The Lion ’;
D. document.querySelector(‘$main li:nth-child(2)’),innerHTML = “ The Lion. ’;


ANSWER : A


JavaScript-Developer-I Sample Question 9


A developer initiates a server with thefile server,js and adds dependencies in the source
codes package,json that are required to run the server.
Which command should the developer run to start the server locally?

A. start server,js
B. npm start server,js
C. npm start
D. node start


ANSWER : C


JavaScript-Developer-I Sample Question 10


A developer has a formatName function that takes two arguments, firstName and lastName
and returns a string. They want to schedule the
function to run once after five seconds.
What is the correctsyntax toschedule this function?

A. setTimeout (formatName(), 5000, "John", "BDoe");
B. setTimeout (formatName('John', ‘'Doe'), 5000);
C. setTimout(() => { formatName("John', 'Doe') }, 5000);
D. setTimeout ('formatName', 5000, 'John", "Doe');


ANSWER : D


JavaScript-Developer-I Sample Question 11


A developer wants to use a module called DataPrettyPrint. This module exports one default
functioncalled printDate ().
How can a developer import and use the printDate() function?

A. Option A
B. Option B
C. Option C
D. Option D


ANSWER : B


JavaScript-Developer-I Sample Question 12


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?

A. window.name is assigned to'hello' and the variable = remains undefined.
B. window.m Is assigned the correct object.
C. The m variable is assigned the correct object but this.name remains undefined.
D. The m variable is assigned the correct object.


ANSWER : A


JavaScript-Developer-I Sample Question 13


Given the followingcode, what is the value of x?
let x = ‘15' + (10 * 2);

A. 35
B. 50
C. 1520
D. 3020


ANSWER : C


JavaScript-Developer-I Sample Question 14



Which code change should be done for the console to log the followingwhen 'Click me!' is
clicked'
> Row log
> Table log

A. Remove lines 13 and14
B. Change line 10 to event.stopPropagation (false) ;
C. Change line 14 to elem.addEventListener ('click', printMessage, true);
D. Remove line 10


ANSWER : D


JavaScript-Developer-I Sample Question 15


A developer has an ErrorHandler module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?

A. all
B. named
C. multi
D. default


ANSWER : B


JavaScript-Developer-I Sample Question 16


A developer creates a simple webpage with an input field. When a user enters text in the
input field and clicks the button, the actual value of the field must bedisplayedin the
console.
Here is the HTML file content:
<input type =” text” value=”Hello” name =”input”>
<button type =”button” >Display </button> The developer wrote the javascript code below:
Const button = document.querySelector(‘button’);
button.addEvenListener(‘click’, () => (
Const input = document.querySelector(‘input’);
console.log(input.getAttribute(‘value’));
When the user clicks the button, the output is always “Hello”.
What needs to be done to make this code work as expected?

A. Replace line 04 with console.log(input .value);
B. Replace line 03 with const input = document.getElementByName(‘input’);
C. Replace line 02 with button.addCallback(“click”, function() {
D. Replace line 02 with button.addEventListener(“onclick”, function() {


ANSWER : A


JavaScript-Developer-I Sample Question 17


Given the code below:
const copy = JSON.stringify([ newString(‘ 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


JavaScript-Developer-I Sample Question 18


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?

A. console.group(usersList) ;
B. console.table(usersList) ;
C. console.info(usersList) ;
D. console.groupCol lapsed (usersList) ;


ANSWER : A


JavaScript-Developer-I Sample Question 19


A developer is leading the creation of a new browser application that will serve a single
page application. The teamwants to use a new web framework Minimalsit.js.The Lead
developer wants to advocate for a more seasoned web framework that already has a
community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

A. Vue
B. Angular
C. Koa
D. Express


ANSWER : B,D


JavaScript-Developer-I Sample Question 20


Given the code below:
Which three code segments result in a correct conversion from number to string? Choose
3answers

A. let strValue = numValue. toString();
B. let strValue = * * 4 numValue;
C. let strValue = numValue.toText ();
D. let scrValue = String(numValue);
E. let strValue = (String)numValue;


ANSWER : A,B,D


JavaScript-Developer-I Sample Question 21


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?

A. Error: myFather.job is not a function
B. Undefined Developer
C. John undefined
D. John Developer


ANSWER : A


JavaScript-Developer-I Sample Question 22


Cloud Kicks has a classto 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 ClothingItemimplements Item{
B. Class ClothingItem {
C. Class ClothingItem super Item {
D. Class ClothingItem extends Item {


ANSWER : D


JavaScript-Developer-I Sample Question 23


Refer to the code below:


Line 05 causes an error.
What are the values of greeting and salutationonce code completes?

A. Greeting is Hello and salutation is Hello, Hello.
B. Greeting is Goodbye and salutation is Hello, Hello.
C. Greeting is Goodbye and salutation is I say Hello.
D. Greeting is Hello and salutation is I say hello.


ANSWER : A


JavaScript-Developer-I Sample Question 24


Given the code below:
Setcurrent URL ();
console.log(‘The current URL is: ‘ +url );
functionsetCurrentUrl() {
Url = window.location.href:
What happens when the code executes?

A. The url variable has local scope and line 02throws an error.
B. The url variable has global scope and line 02 executes correctly.
C. The url variable has global scope and line 02 throws an error.
D. The url variable has local scope and line 02 executes correctly.


ANSWER : B


JavaScript-Developer-I Sample Question 25


A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log (“Grr!”);
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log(“Grr!”);
}
After deciding on an option, thedeveloper creates 1000 monster objects.
How many growl methods are created with Option A Option B?

A. 1 growl method is created for Option A.1000 growl methods are created for Option B.
B. 1000 growl method is created for Option A. 1 growl methods are created for Option B.
C. 1000 growl methods are created regardless of which option is used.
D. 1 growl method is created regardless of whichoption is used.


ANSWER : B


JavaScript-Developer-I Sample Question 26


Refer to the codebelow:
function foo () {
const a =2;
function bat() {
console.log(a);
}
return bar;
}
Why does the function bar have access tovariable a ?

A. Inner function’s scope
B. Hoisting
C. Outer function’s scope
D. Prototype chain


ANSWER : C


JavaScript-Developer-I Sample Question 27


Refer to the code below:


What is the output of this function when called with an empty array?

A. Return 0
B. Return 5
C. Return NaN
D. Return Infinity


ANSWER : B


JavaScript-Developer-I Sample Question 28


Given the code below:
FunctionmyFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

A. Both lines 08 and 09 are executed, and the variables are outputted.
B. Line 08 outputs the variable, but line 09 throws an error.
C. Line 08thrones an error, therefore line 09 is never executed.
D. Both lines 08 and 09 are executed, but values outputted are undefined.


ANSWER : B


JavaScript-Developer-I Sample Question 29


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 replaceline 01 and declare the function for use?
Choose 2 answers

A. function leg(logInput) {
B. const log(loginInput) {
C. const log = (logInput) => {
D. function log = (logInput) {


ANSWER : A,C


JavaScript-Developer-I Sample Question 30


Refer to the following code block:


What is the console output?

A. > Better student Jackie got 70% on test.
B. > Jackie got 70% on test.
C. > Uncaught Reference Error
D. > Better student Jackie got 100% on test.


ANSWER : D


JavaScript-Developer-I Sample Question 31


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.filter((val) => val < 10).map((num) -> num = 1.25);
B. let arrl = arr .rr.acArray ((val) => ( val < 10 )) ,map((num) => { num * 1.25 ));
C. let arrl = arr-map((num) => { return ran * 1.25 }).filter((val) -> { return val < 10));
D. let arrl = arr.filterBy((val) => val < 10 ).aapBy<(num) -> num = ..25 );


ANSWER : C


JavaScript-Developer-I Sample Question 32


GIven a value, which three options can a developer use to detect if thevalue is NaN?
Choose 3 answers !

A. value == NaN
B. Object.is(value, NaN)
C. value === Number.NaN
D. value ! == value
E. Number.isNaN(value)


ANSWER : A,E


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