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Salesforce JavaScript-Developer-I Sample Questions

Question # 1

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


Question # 2

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.


Question # 3

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.


Question # 4

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.


Question # 5

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 haveall ofthe properties and methods of the Item class but will also have properties that are specifictoclothes.Which line of code properly declares the clothingItem class such that it inherits fromItem?

A. Class ClothingItemimplements Item{
B. Class ClothingItem {
C. Class ClothingItem super Item {
D. Class ClothingItem extends Item {


Question # 6

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


Question # 7

Given the code below:Which three code segments result in a correct conversion from number to string? Choose3answers

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;


Question # 8

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

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


Question # 9

Given the code below: Which method can be used to provide a visual representation of the list of users and toallow sorting by the name or email attribute?

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


Question # 10

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 ]--


Question # 11

A developer creates a simple webpage with an input field. When a user enters text in theinput field and clicks the button, the actual value of the field must bedisplayedin theconsole.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() {


Question # 12

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


Question # 13

Which code change should be done for the console to log the followingwhen 'Click me!' isclicked'> 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


Question # 14

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

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


Question # 15

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.


Question # 16

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

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


Question # 17

A developer has a formatName function that takes two arguments, firstName and lastNameand returns a string. They want to schedule thefunction 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');


Question # 18

A developer initiates a server with thefile server,js and adds dependencies in the sourcecodes 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


Question # 19

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. ’;


Question # 20

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) ;


Question # 21

A developer receives a comment from the Tech Lead that thecode given below haserror: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) {


Question # 22

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;


Question # 23

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.


Question # 24

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}


Question # 25

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) ? /*Insertcode*/;06 )};07 }Which code should replace the placeholder comment on line 05 to hide accounts that donot match thesearch string?

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


Question # 26

Considering the implications of 'use strict' on line 04, which three statements describe theexecution 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.


Question # 27

Refer to the following code: Which statement should be added to line 09 for the code to display. The boat has acapacity of 10 people?

A. super.size = size;
B. ship.size size;
C. super (size);
D. this.size = size;


Question # 28

A developer is working onan ecommerce website where the delivery date is dynamicallycalculated based on the current day. The code line below is responsible for this calculation.Const deliveryDate = new Date ();Due to changes in the business requirements, the delivery date mustnow be today’sdate + 9 days.Which code meets thisnew requirement?

A. deliveryDate.setDate(( new Date ( )).getDate () +9);
B. deliveryDate.setDate( Date.current () + 9);
C. deliveryDate.date = new Date(+9) ;
D. deliveryDate.date = Date.current () + 9;


Question # 29

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. Outer message
B. Outer messageInner message
C. Inner messageOuter message
D. Inner message


Question # 30

Refer to the code below:ConstresolveAfterMilliseconds = (ms) => Promise.resolve (setTimeout ((=> console.log(ms), ms ));Const aPromise = await resolveAfterMilliseconds(500);Const bPromise = await resolveAfterMilliseconds(500);Await aPromise, wait bPromise;What is the result of running line 05?

A. aPromise and bPromise run sequentially.
B. Neither aPromise or bPromise runs.
C. aPromise and bPromise run in parallel.
D. Only aPromise runs.


Question # 31

A developer is asked to fix some bugs reported by users. To do that, the developer addsabreakpoint for debugging.Function Car (maxSpeed, color){This.maxspeed =masSpeed;This.color= color;Let carSpeed = document.getElementById(‘ CarSpeed’);Debugger; Let fourWheels =new Car (carSpeed.value, ‘red’);When the code execution stops at the breakpoint on line 06, which two types of informationareavailable in the browser console ?Choose 2 answers:

A. The values of the carSpeed and fourWheels variables
B. A variable displaying the number of instances created for the Car Object.
C. The style, event listeners and other attributes applied to the carSpeed DOM element
D. The informationstored in the window.localStorage property


Question # 32

A developer is setting up a Node,js server and is creating a script at the root of the sourcecode, index,js, that will start the server when executed. The developer declares a variablethat needsthe folder location that the code executes from.Which global variable can be used in the script?

A. window.location
B. _filename
C. _dirname
D. this.path


Question # 33

In the browser, the window objectis often used to assign variables that require the broadestscope in an application Node.js application does not have access to the window object bydefault.Which two methods areused to address this ?Choose 2 answers

A. Use the document object instead of the window object.
B. Assign variables to the global object.
C. Create a new window object in the root file.
D. Assign variables to module.exports and require them as needed.


Question # 34

Refer to HTML below:<div id=”main”><div id = “ card-00”>This card is smaller.</div><div id = “card-01”>The width and height of this card is determined by itscontents.</div></div>Which expression outputs the screen width of the element with the ID card-01?

A. document.getElementById(‘ card-01 ’).getBoundingClientRest().width
B. document.getElementById(‘ card-01 ’).style.width
C. document.getElementById(‘ card-01 ’).width
D. document.getElementById(‘ card-01 ’).innerHTML.lenght*e


Question # 35

Adeveloper has an ErrorHandler module that contains multiple functions.What kind of export be leverages so that multiple functions can beused?

A. Named
B. All
C. Multi
D. Default


Question # 36

A developer writes the code below to return a message to a user attempting to register anew username. If the username is available, a variable named nag is declared andassigned a value on line 03. What is the value of msg when getAvailableabilityMessage (“newUserName”) is executed and get Availability (“newUserName”) returns true?

A. "msg is not defined"
B. "newUserName"
C. "User-name available"
D. undefined


Question # 37

Refer to the code below:Function Person(firstName, lastName,eyecolor) {this.firstName =firstName;this.lastName = lastName;this.eyeColor = eyeColor;}Person.job = ‘Developer’;const myFather = new Person(‘John’, ‘Doe’);console.log(myFather.job);What is the output after the code executes?

A. ReferenceError: eyeColor is not defined
B. ReferenceError: assignment to undeclared variable “Person”
C. Developer
D. Undefined


Question # 38

Given HTML below:<div><div id =”row-uc”>UniversalContainer</div><div id =”row-aa”>Applied Shipping</div><div id =”row-bt”> Burlington Textiles </div></div>Which statement adds the priority = account CSS class to the universal Containers row ?

A. Document .querySelector(‘#row-uc’).classes.push(‘priority-account’);
B. Document .queryElementById(‘row-uc’).addclass(‘priority-account’);
C. Document .querySelector(‘#row-uc’).classList.add(‘priority-account’);
D. Document .querySelectorALL(‘#row-uc’).classList.add(‘priority-account’);


Question # 39

Refer to the string below:const str = 'Salesforce';Which two statements result in the word 'Sales'?Choose 2 answers

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


Question # 40

A developer is leading the creation of a new web server for their team that will fulfill APIrequests from an existing client.The team wants a web server that runs on Node.Js, and they want to use thenew webframework Minimalist.Js. The lead developer wants to advocate for a more seasoned backendframework that already has a community around it.Which two frameworks could the lead developer advocate for?Choose 2 answers

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


Question # 41

A developer has an is Dog function that takes one argument cat. They want to schedule thefunction to run every minute. What is the correct syntax for scheduling this function?

A. setInterval(isDog, 60000,'cat');


Question # 42

Refer to thefollowing 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 runswithouterror?Choose 2 answers

A. // FooUtils.js and BarUtils.js existImport (foo) from ‘/path/FooUtils.js’;Import (boo) from ‘/path/NarUtils.js’;
B. const foo = () => { return ‘foo’ ; }const bar = () => { return ‘bar’ ; }export { bar, foo }
C. Export default class {foo() { return ‘foo’ ; }bar() { return ‘bar’ ; }}
D. const foo = () => { return ‘foo’;}const bar = () => {return ‘bar’; }Export default foo, bar;


Question # 43

developer removes the HTML class attribute from the checkout button, so now it issimply:<button>Checkout</button>.There is a test to verify the existence of the checkout button, however it looks fora buttonwithclass= “blue”. The test failsbecause no such button is found.Which type of test category describes this test?

A. True positive
B. True negative
C. False positive
D. False negative


Question # 44

A developer has the following array of student test grades:Let arr = [ 7, 8, 5, 8, 9 ];The Teacherwants to double each score and then see an array of the students who scored more than 15 points.How should thedeveloper 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). Filter (( val) => val > 15);
D. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));


Question # 45

A developer creates an object where its propertiesshould be immutable and preventproperties from being added or modified.Which method should be used to execute this businessrequirement ?

A. Object.const()
B. Object.eval()
C. Object.lock()
D. Object.freeze()


Question # 46

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. 1 3 2
C. 2 1 3
D. 2 3 1


Question # 47

Which two options arecore Node.js modules?Choose 2 answers

A. worker
B. isotream
C. exception
D. http


Question # 48

A developer wants to iterate through an array of objects and count the objects and countthe objects whose property value, name, starts with the letterN.Const arrObj = [{“name” : “Zach”} , {“name” :“Kate”},{“name” : “Alise”},{“name” :“Bob”},{“name” :“Natham”},{“name” : “nathaniel”}Refer to the code snippet below:01 arrObj.reduce(( acc, curr) => {02 //missing line 0202 //missing line 0304 ). 0);Which missing lines 02 and 03 return the correctcount?

A. Const sum = curr.startsWith(‘N’) ? 1: 0;Return acc +sum
B. Const sum = curr.name.startsWith(‘N’) ? 1: 0;Return acc +sum
C. Const sum = curr.startsWIth(‘N’) ? 1: 0;Return curr+ sum
D. Const sum =curr.name.startsWIth(‘N’) ? 1: 0;Return curr+ sum


Question # 49

A developer writers the code below to calculate the factorial of a given number.Function factorial(number) {Return number + factorial(number -1);}factorial(3);What is the resultof executing line 04?

A. 0
B. 6
C. -Infinity
D. RuntimeError


Question # 50

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

A. name
B. owner
C. type
D. canTalk
E. size


Question # 51

developer creates a new web server that uses Node.js. It imports a server library thatuses events and callbacks for handling server functionality.The server library is imported with require and is made available to the code by avariable named server. The developer wants to log any issues that the server has whilebootingup.Given the code and the information thedeveloper has, which code logs an error at boostwith an event?

A. Server.catch ((server) => {console.log(‘ERROR’, error);});
B. Server.error ((server) => {console.log(‘ERROR’, error);});
C. Server.on (‘error’, (error) => {console.log(‘ERROR’, error);});
D. Try{server.start();} catch(error) {console.log(‘ERROR’, error);}


Question # 52

Refer to the code below: Which replacement for the conditionalstatement on line 02 allows a developer to correctlydeterminethat a specific element, myElement on the page had been clicked?

A. event.target.id =='myElement'


Question # 53

Refer to the code below:letsayHello = () => {console.log (‘Hello, world!’);};Which code executes sayHello once, two minutes from now?

A. setTimeout(sayHello, 12000);
B. setInterval(sayHello, 12000);
C. setTimeout(sayHello(), 12000);
D. delay(sayHello, 12000);


Question # 54

Refer to the following code: What is the value ofoutput on line 11?

A. [1, 2]
B. [‘’foo’’, ‘’bar’’]
C. [‘’foo’’:1, ‘’bar’’:2’’]
D. An error will occur due to the incorrect usage of the for…of statement on line 07.


Question # 55

Which codestatement below correctly persists an objects in local Storage ?

A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject)); }
B. const setLocalStorage = ( jsObject) => { window.localStorage.connectObject(jsObject)); }
C. const setLocalStorage = ( jsObject) => { window.localStorage.setItem(jsObject); }
D. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject); }


Question # 56

A developer wants to define a function log to be used a few times on a single-fileJavaScript script.01 // Line 1 replacement02 console.log('"LOG:', logInput);03 }Which two options can correctly replace line 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) {


Question # 57

A developer wants to create an object from a function in the browser using the codebelow:Function Monster() { this.name =‘hello’ };Const z = Monster();What happens due to lack of the new keyword on line 02?

A. The z variable is assigned the correct object.
B. The z variable is assigned the correct object but this.name remains undefined.
C. Window.name is assigned to ‘hello’ and the variable z remains undefined.
D. Window.m is assigned the correct object.


Question # 58

A developer uses a parsed JSON string to work with userinformation as in the block below:01 const userInformation ={02 “ id ” : “user-01”,03 “email” : “[email protected]”,04 “age” : 25Which two options access the email attribute in the object?Choose 2 answers

A. userInformation(“email”)
B. userInformation.get(“email”)
C. userInformation.email
D. userInformation(email)


Question # 59

Considering type coercion, what does the following expression evaluate to?True + ‘13’ + NaN

A. ‘ 113Nan ’
B. 14
C. ‘ true13 ’
D. ‘ true13NaN ’


Question # 60

A developer creates a class that represents a blog post based on the requirement that aPost should have a body author and view count.The Code shown Below:ClassPost {// Insert code hereThis.body =bodyThis.author = author;this.viewCount = viewCount;}}Which statement should be inserted in the placeholder on line 02 to allow for a variable tobe setto a new instanceof a Post with the three attributes correctly populated?

A. super (body, author, viewCount) {
B. Function Post (body, author, viewCount) {
C. constructor (body, author, viewCount) {
D. constructor() {


Question # 61

Refer to the code below:Let foodMenu1 =[‘pizza’, ‘burger’, ‘French fries’];Let finalMenu = foodMenu1;finalMenu.push(‘Garlic bread’);What is the value of foodMenu1 after the code executes?

A. [ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]
B. [ ‘pizza’,’Burger’, ‘French fires’]
C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]
D. [ ‘Garlic bread’]


Question # 62

Universal Containers (UC) just launched a new landing page, but users complain that thewebsite is slow. A developer found some functions any that might cause this problem. Toverify this, the developer decides to execute everything and log the time each of thesethree suspicious functions consumes.Which function can the developer use to obtain the time spent by every one of the threefunctions?

A. console. timeLog ()
B. console.timeStamp ()
C. console.trace()
D. console.getTime ()


Question # 63

Which three statements are true about promises ?Choose 3 answers

A. The executor of a new Promise runs automatically.
B. A Promise has a .then() method.
C. A fulfilled or rejected promise will not change states .
D. A settled promise can become resolved.
E. A pending promise canbecome fulfilled, settled, or rejected.


Question # 64

A developer creates an object where its properties should be immutable and preventproperties from being added or modified.Which method shouldbe used to execute this business requirement ?

A. Object.const()
B. Object.eval()
C. Object.lock()
D. Object.freeze()


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