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Salesforce JavaScript-Developer-I Sample Questions

Question # 1

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)

Question # 2

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 );

Question # 3

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.

Question # 4

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) {

Question # 5

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.

Question # 6

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

Question # 7

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 # 8

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 # 9

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 # 10

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 # 11

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 {

Question # 12

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 # 13

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;

Question # 14

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

Question # 15

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) ;

Question # 16

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 # 17

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() {

Question # 18

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 # 19


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

Question # 20

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

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

Question # 21

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 # 22

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

Question # 23

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');

Question # 24

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

Question # 25

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 # 26

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 # 27

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) {

Question # 28

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 # 29

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 # 30

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 # 31

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 ’

Question # 32

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.

Question # 33

Refer to the following code:


Which statement should be added to line 09 for the code to display. The boat has a
capacity of 10 people?

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



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