JS-Dev-101 Free Dumps (Part 2, Q35-Q60) of V8.02 – Read More Demo Questions to Verify the Latest Salesforce Certified JavaScript Developer Questions

Using the latest Salesforce JS-Dev-101 dumps (V8.02) helps you study more effectively, clarify difficult concepts, and greatly improve your chances of success on the actual exam. You may have read our JS-Dev-101 free dumps (Part 1, Q1-Q34) of V8.02 before, and you found that our dump questions will help you understand the key exam topics, improve your confidence, and prepare more efficiently for the real Salesforce Certified JavaScript Developer (JS-Dev-101) certification exam. To help you check more about the JS-Dev-101 dumps (V8.02), we will continue to share demos today. Then you can confirm that these dumps are especially useful for you, if you want a simple, direct, and practical way to get ready for the Salesforce JS-Dev-101 exam without spending too much time searching through scattered resources.

Below are the JS-Dev-101 free dumps (Part 2, Q35-Q60) of V8.02 for checking more:

1. Given:

const str = 'Salesforce';

Which two statements result in 'Sales'?

str.substring(0, 5);

str.substring(1, 5);

str.substr(0, 5);

str.substr(1, 5);

2. Given the following code:

01 let x = null;

02 console.log(typeof x);

What is the output of line 02?

"object"

"undefined"

"x"

"null"

3. Refer to the code below:

let inArray = [ [1, 2], [3, 4, 5] ];

Which two statements result in the array [1, 2, 3, 4, 5]? (With corrected typing errors: usArray → inArray, .. → ....)

[].concat(...inArray);

[].concat.apply(inArray, []);

[].concat::...inArray();

[].concat.apply({}, inArray);

4. Original constructor function:

01 function Vehicle(name, price) {

2 this.name = name;

3 this.price = price;

4 }

5 Vehicle.prototype.priceInfo = function () {

6 return `Cost of the $(this.name) is $(this.price)$`;

7 }

8 var ford = new Vehicle('Ford Fiesta', '20,000'); Which class definition is correct?

class Vehicle { constructor(name, price) { this.name = name; this.price = price; } priceInfo() { return 'Cost of the ${this.name} is ${this.price}$'; } }

class Vehicle { vehicle(name, price) { this.name = name; this.price = price; } priceInfo() { return 'Cost of the ${this.name} is ${this.price}$'; } }

class Vehicle { constructor() { this.name = name; this.price = price; } priceInfo() { return `Cost of the ${this.name} is ${this.price}$`; } }

class Vehicle { constructor(name, price) { this.name = name; this.price = price; } priceInfo() { return `Cost of the ${this.name} is ${this.price}$`; } }

5. A developer wants to catch any error that countSheep() may throw and pass it to handleError().

Which implementation is correct?

try { setTimeout(function() { countSheep(); }, 1000); } catch (e) { handleError(e); }

try { countSheep(); } finally { handleError(e); }

try { countSheep(); } handleError(e) { catch(e); }

setTimeout(function() { try { (Answer incomplete in option list.)

6. Refer to the following code (correcting the missing template literal backticks):

let codeName = 'Bond';

let sampleText = `The name is ${codeName}, Jim ${codeName}`;

A developer is trying to determine if a certain substring is part of a string.

Which three code statements return true?

sampleText.includes('Jim');

sampleText.includes('The', 1);

sampleText.includes('Jim', 4);

sampleText.indexOf('Bond') !== -1;

sampleText.substring('Jim');

7. Refer to the code:

const pi = 3.1415926;

What is the data type of pi?

Float

Double

Decimal

Number

8. After user acceptance testing, the developer is asked to change the webpage background based on the user’s location. It works on the developer’s computer but not on the tester’s machine.

Which two actions will help determine accurate results?

The tester should disable their browser cache.

The developer should inspect their browser refresh settings.

The tester should clear their browser cache.

The developer should rework the code.

9. A class was written to represent regular items and sale items. Code:

01 let regItem = new Item('Scarf', 55);

02 let saleItem = new SaleItem('Shirt', 80, .1);

03 Item.prototype.description = function() { return 'This is a ' + this.name; }

4 console.log(regItem.description());

5 console.log(saleItem.description());

6

07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; }

8 console.log(regItem.description());

9 console.log(saleItem.description()); What is the output?

This is a Scarf Uncaught TypeError: saleItem.description is not a function This is a Shirt This is a discounted Shirt

This is a Scarf This is a Shirt This is a Scarf This is a discounted Shirt

This is a Scarf Uncaught TypeError: saleItem.description is not a function This is a Scarf This is a discounted Shirt

This is a Scarf This is a Shirt This is a discounted Scarf This is a discounted Shirt

10. then(() => console.log('Resolved4'));

What is the result when the Promise in the execute function is rejected?

Resolved1 Resolved2 Resolved3 Rejected Resolved4

Rejected

Resolved1 Resolved2 Resolved3 Resolved4

Rejected Resolved4

11. What are two unique features of fat-arrow functions compared to normal function definitions?

If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

The function uses the this from the enclosing scope.

The function receives an argument called parentThis, giving the enclosing lexical scope.

The function generates its own this making it useful for separating scope.

12. Refer to the code:

01 const exec = (item, delay) =>

2 new Promise(resolve => setTimeout(() => resolve(item), delay));

3

4 async function runParallel() {

5 const [result1, result2, result3] = await Promise.all(

6 [exec('x', '100'), exec('y', '500'), exec('z', '100')]

7 );

8 return `parallel is done: ${result1}${result2}${result3}`;

9 }

Which two statements correctly execute runParallel()?

async runParallel().then(data);

runParallel().then(function(data){ return data; });

runParallel().done(function(data){ return data; });

runParallel().then(data);

13. Refer to the code below:

01 x = 3.14;

02

03 function myFunction() {

4 'use strict';

5 y = x;

6 }

7

8 z = x;

9 myFunction();

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

'use strict' is hoisted, so it has an effect on all lines.

z is equal to 3.14.

'use strict' has an effect between line 04 and the end of the file.

'use strict' has an effect only on line 05.

Line 05 throws an error.

14. Code:

01 let array = [1, 2, 3, 4, 4, 5, 4, 4];

02 for (let i = 0; i < array.length; i++) {

3 if (array[i] === 4) {

4 array.splice(i, 1);

5 i--;

6 }

7 }

What is the value of array after execution?

[1,2,3,4,5,4]

[1,2,3,5]

[1,2,3,4,5,4,4]

[1,2,3,4,4,5,4]

15. A developer wants to set up a secure web server with Node.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?

const server = require('secure-server');

const tls = require('tls');

const http = require('http');

const https = require('https');

16. A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed.

The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.

01 function listen(event) {

02

3 alert('Hey! I am John Doe');

4

5 }

6 button.addEventListener('click', listen);

Which two code lines make this code work as required?

On line 04, use event.stopPropagation();

On line 02, use event.first to test if it is the first execution.

On line 06, add an option called once to button.addEventListener().

On line 04, use button.removeEventListener('click', listen);

17. Given the code:

const copy = JSON.stringify([new String('false'), new Boolean(false), undefined]);

What is the value of copy?

'["false", false, null]'

'[false, {}]'

'["false", false, undefined]'

'["false", {}]'

18. Refer to the code below:

01 let sayHello = () => {

2 console.log('Hello, World!');

3 };

Which code executes sayHello once, two minutes from now?

delay(sayHello, 120000);

setTimeout(sayHello, 120000);

setTimeout(sayHello(), 120000);

setInterval(sayHello, 120000);

19. Original code:

01 let requestPromise = client.getRequest;

3 requestPromise().then((response) => {

4 handleResponse(response);

5 });

The developer wants to gracefully handle errors from a Promise-based GET request.

Which code modification is correct?

try/catch around requestPromise().then(...)

(duplicate of A)

Add .catch to the Promise chain

Use finally handler for errors

20. Refer to the code:

01 console.log('Start');

2 Promise.resolve('Success').then(function(value) {

3 console.log('Success');

4 });

5 console.log('End');

What is the output after the code executes successfully?

Start Success End

Start End Success

End Start Success

Success Start End

21. Which statement accurately describes the behavior of the async/await keywords?

The associated function sometimes returns a promise.

The associated function can only be called via asynchronous methods.

The associated class contains some asynchronous functions.

The associated function is asynchronous, but acts like synchronous code.

22. Refer to the code below:

01 function myFunction(reassign) {

2 let x = 1;

3 var y = 1;

4

5 if (reassign) {

6 let x = 2;

7 var y = 2;

8 console.log(x);

9 console.log(y);

10 }

11

12 console.log(x);

13 console.log(y);

14 }

What is displayed when myFunction(true) is called?

 

2222

2212

2211

2 2 undefined undefined

23. Refer to the code below:

01 async function functionUnderTest(isOK) {

02 if (isOK) return 'OK';

3 throw new Error('not OK');

4 }

Which assertion accurately tests the above code?

console.assert(await functionUnderTest(true), 'OK')

console.assert(await (functionUnderTest(true), 'not OK'))

console.assert(functionUnderTest(true), 'OK')

console.assert(await functionUnderTest(true), 'not OK')

24. Given the code:

01 function GameConsole(name) {

2 this.name = name;

3 }

4

5 GameConsole.prototype.load = function(gamename) {

6 console.log('${this.name} is loading a game: ${gamename}....');

7 }

8

9 function Console16bit(name) {

10 GameConsole.call(this, name);

11 }

12

13 Console16bit.prototype = Object.create(GameConsole.prototype);

14

15 // insert code here

16 console.log('${this.name} is loading a cartridge game: ${gamename}....');

17 }

18

19 const console16bit = new Console16bit('SNEGeneziz');

20 console16bit.load('Super Monic 3x Force');

What should a developer insert at line 15?

Console16bit = Object.create(GameConsole.prototype).load = function(gamename) {

Console16bit.prototype.load(gamename) = function() {

Console16bit.prototype.load(gamename) {

Console16bit.prototype.load = function(gamename) {

25. Refer to the following code block:

01 let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11];

02 let output = 0;

03

04 for (let num of array) {

5 if (output > 10) {

6 break;

7 }

8 if (num % 2 == 0) {

9 continue;

10 }

11 output += num;

12 }

What is the value of output after the code executes?

16

25

11

36

26. A developer imports:

import printPrice from '/path/PricePrettyPrint.js';

What must be true about printPrice for this import to work?

printPrice must be a named export

printPrice must be an all export

printPrice must be the default export

printPrice must be a multi export

 Loading...