Salesforce Certified JavaScript Developer Dumps (V8.02) with Comprehensive Q&As: Check Salesforce Certified JavaScript Developer Free Dumps (Part 1, Q1-Q38) First

1. A developer creates a class that represents a blog post based on the requirement that a Post should have a body author and view count.

The Code shown Below:

Class Post{

// Insert code here This.body =body This.author = author; this.viewCount = viewCount;

}

}

Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set to a new instanceof a Post with the three attributes correctly populated?

2. Which code statement correctly retrieves and returns an object from localStorage?

3. 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

4. Refer to the HTML below:

<div id=”main”>

<ul>

<li>Leo</li>

<li>Tony</li>

<li>Tiger</li>

</ul>

</div>

Which JavaScript statement results in changing “ Tony” to “Mr. T.”?

5. Refer to the following code:

01 function Tiger(){

02this.Type = ‘Cat’;

03 this.size = ‘large’;

4 }

5

6 let tony = new Tiger();

7 tony.roar = () =>{

8 console.log(‘They’re great1’);

9 };

10

11 function Lion(){

12 this.type = ‘Cat’;

13 this.size = ‘large’;

14 }

15

16 let leo = new Lion();

17 //Insertcode here

18 leo.roar();

Which two statements could be inserted at line 17 to enable the function call on line 18? Choose 2 answers.

6. At Universal Containers, every team has its own way of copying JavaScript objects.

The code Snippet shows an implementation from one team:

Function Person() {

this.firstName = “John”;

this.lastName = ‘Doe’;

This.name =() => (

console.log(‘Hello $(this.firstName) $(this.firstName)’);

)}

Const john = new Person ();

Const dan =JSON.parse(JSON.stringify(john));

dan.firstName =’Dan’;

dan.name();

What is the Output of the code execution?

7. A Developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three number in the array, The test passes:

Let res = sum2([1, 2, 3]);

console.assert(res === 6 );

Res = sum3([ 1, 2, 3, 4]);

console.assert(res=== 6);

A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array.

The test passes:

Which two results occur when running the test on the updated sum3 function? Choose 2 answers

8. A developer is asked to fix some bugs reported by users. To do that, the developer adds abreakpoint 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 information are available in the browser console? Choose 2 answers:

9. developer removes the HTML class attribute from the checkout button, so now it is simply:

<button>Checkout</button>.

There is a test to verify the existence of the checkout button, however it looks fora button with class= “blue”. The test fails because no such button is found.

Which type of test category describes this test?

10. A developer has an ErrorHandler module that contains multiple functions.

What kind of export be leverages so that multiple functions can beused?

11. Refer to the code below:

Let car1 = new Promise((_, reject) =>

setTimeout(reject, 2000, “car 1 crashed in” =>

Let car2 =new Promise(resolve => setTimeout(resolve, 1500, “car 2 completed”)

Let car3 =new Promise(resolve =>setTimeout(resolve, 3000, “car 3 completed”)

Promise.race(( car1, car2, car3))

.then (value => (

Let result = ‘$(value) the race.’;)}

.catch(arr => {

console.log(“Race is cancelled.”, err);

});

What is the value of result when Promise.race executes?

12. A developer wants to set up a secure web server withNode.js. The developer creates 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?

13. Referto the code below:

new Promise((resolve, reject) => {

const fraction = Math.random();

if( fraction >0.5) reject("fraction > 0.5, " + fraction);

resolve(fraction);

})

.then(() =>console.log("resolved"))

.catch((error) => console.error(error))

.finally(() =>console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

14. Which two console logs outputs NaN? Choose 2 answers

15. 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?

16. What is the result of the code block?

17. Refer to the code below:

Const pi = 3.1415326,

What is the data type of pi?

18. Refer to the code below:

Let textValue = ’1984’;

Which code assignment shows a correct way to convert this string to an integer?

19. 1.Refer to the code below:

01 const exec = (item, delay) =>{

02 newPromise(resolve => setTimeout( () => resolve(item), delay)),

03 async function runParallel() {

04 Const (result1, result2, result3) = await Promise.all{

05 [exec (‘x’, ‘100’), exec(‘y’, 500), exec(‘z’, ‘100’)]

06 );

7 return `parallel is done: $(result1)$(result2)$(result3)`;

8 }

}

}

Which two statements correctly execute the runParallel () function? Choose 2 answers

20. Refer to the code below:

const event = new CustomEvent(

//Missing Code

);

obj.dispatchEvent(event);

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

21. A class was written to represent items for purchase in an online store, and a second class. Representing items that are on sale at a discounted price. The constructor sets the name to the first value passed in.

The pseudocode is below:

Class Item {

constructor(name, price) {

… // Constructor Implementation

}

}

Class SaleItem extends Item {constructor (name, price, discount) {

...//Constructor Implementation

}

}

There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.

Let regItem =new Item(‘Scarf’, 55);

Let saleItem = new SaleItem(‘Shirt’ 80, -1);

Item.prototype.description = function () { return ‘This is a ’ + this.name; console.log(regItem.description()); console.log(saleItem.description()); SaleItem.prototype.description = function () { return ‘This is a discounted ’ +

this.name; }

console.log(regItem.description());

console.log(saleItem.description());

What is the output when executing the code above?

22. A developer wants to create an object from a function in the browser using the code below:

Function Monster() { this.name = ‘hello’ };

Const z = Monster();

What happens due to lack of the new keyword on line 02?

23. Which three options show valid methods for creating a fat arrow function?

Choose 3 answers

24. A developer uses a parsed JSON string to work with user information as in the block below:

01 const userInformation ={

02 “ id ”: “user-01”,

03 “email”: “[email protected]”,

04 “age”: 25

Which two options access the email attribute in the object? Choose 2 answers

25. Refer to the code below:

letsayHello = () => {

console.log (‘Hello, world!’);

};

Which code executes say Hello once, two minutes from now?

26. 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 thedeveloper implement the request?

27. Given the following code:

Counter = 0;

const logCounter = () => {

console.log(counter);

);

logCounter();

setTimeout(logCOunter, 1100);

setInterval(() => {

Counter++

logCounter();

}, 1000);

What is logged by the first four log statements?

28. Given the JavaScript below:

01 function filterDOM (searchString) {

02 const parsedSearchString = searchString && searchString.toLowerCase() ;

03 document.quesrySelectorAll(‘ .account’ ) . forEach(account => (

04 const accountName = account.innerHTML.toLOwerCase();

05 account. Style.display = accountName.includes(parsedSearchString)? /*Insert code*/;

6 )};

7 }

Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

29. A developer wants to iterate through an array of objects and count the objects and count the 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 02

02 //missing line 03

04 ). 0);

Which missing lines 02 and 03 return the correct count?

30. Given the following code:

Let x =(‘15’ + 10)*2;

What is the value of a?

31. 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?

32. Which statement accurately describes an aspect of promises?

33. Refer to the code below:

Async funct on functionUnderTest(isOK) {

If (isOK) return ‘OK’;

Throw new Error(‘not OK’);

)

Which assertion accurately tests the above code?

34. Refer to the code snippet:

Function getAvailabilityMessage(item) {

If (getAvailability(item)){

Var msg =”Username available”;

}

Return msg;

}

A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.

What is the return value of msg hen getAvailabilityMessage (“newUserName” ) is executed and getAvailability(“newUserName”) returns false?

35. A developer is debugging a web server that uses Node.js The server hits a runtime error every third request to an important endpoint on the web server.

The developer added a break point to the start script, that is at index.js at he root of the server’s source code. The developer wants to make use of chrome DevTools to debug.

Which command can be run to access DevTools and make sure the breakdown is hit?

36. 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?

37. Given code below:

setTimeout (() => (

console.log (1);

). 0);

console.log (2);

New Promise ((resolve, reject)) = > (

setTimeout(() => (

reject (console.log (3));

). 1000);

)).catch (() => (

console.log (4);

));

console.log (5);

What is logged to the console?

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