Salesforce JavaScript Developer I Training Material

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Salesforce JavaScript Developer I training material is available here. There are 60 multiple-choice questions in real JavaScript Developer I exam, and you have 105 minutes to finish the test. The required passing score of Salesforce JavaScript Developer I exam is 65%. The registration fee is $200. Use the latest JavaScript Developer I training material to pass the test easily. Free Salesforce JavaScript Developer I training material is below.

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1. The developer wants to test this code:

Const toNumber =(strOrNum) => strOrNum;

Which two tests are most accurate for this code? Choose 2 answers

console.assert(toNumber(‘2’) === 2);

console.assert(Number.isNaN(toNumber()));

console.assert(toNumber(‘-3’) < 0);

console.assert(toNumber () === NaN);

2. Refer to HTML below:

<p> The current status of an Order: <span id =”status”> In Progress </span> </p>.

Which JavaScript statement changes the text ‘In Progress’ to ‘Completed’?

document.getElementById(“status”).Value = ’Completed’ ;

document.getElementById(“#status”).innerHTML = ’Completed’ ;

document.getElementById(“status”).innerHTML = ’Completed’ ;

document.getElementById(“.status”).innerHTML = ’Completed’ ;

3. Which three statements are true about promises? Choose 3 answers

The executor of a new Promise runs automatically.

A Promise has a .then() method.

A fulfilled or rejected promise will not change states .

A settled promise can become resolved.

A pending promise can become fulfilled, settled, or rejected.

4. A developer is debugging a web server that uses Node.js The server hits a runtimeerror 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?

node -i index.js

Node --inspect-brk index.js

Node inspect index.js

Node --inspect index.js

5. Cloud Kicks has a class to 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?

Class ClothingItem implements Item{

Class ClothingItem {

Class ClothingItem super Item {

Class ClothingItem extends Item {

6. Refer to the code:

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

Name

canTalk

Type

Owner

Size

7. 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 the developer implement the request?

Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))

Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;

Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);

Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));

8. 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?

0 0 1 2

0 1 2 3

0 1 1 2

0 1 2 2

9. Given the code below:

Function myFunction(){

A =5; Var b =1;

}

myFunction();

console.log(a);

console.log(b);

What is the expected output?

Both lines 08 and 09 are executed, and the variables are outputted.

Line 08 outputs the variable, but line 09 throws an error.

Line 08 thrones an error, therefore line 09 is never executed.

Both lines 08 and 09 are executed, but values outputted are undefined.

10. 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

userInformation(“email”)

userInformation.get(“email”)

userInformation.email

userInformation(email)

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11. Refer to the following object:

const cat ={

firstName: ‘Fancy’,

lastName: ‘ Whiskers’,

Get fullName() {

return this.firstName + ‘ ‘ + this.lastName;

}

};

How can a developer access the fullName property for cat?

cat.fullName

cat.fullName()

cat.get.fullName

cat.function.fullName()

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

console.log(10/ Number(‘5’));

console.log(parseInt(‘two’));

console.log(10/ ‘’five);

console.log(10/0);

13. Refer to the code snippet below:

Let array = [1, 2, 3, 4, 4, 5, 4, 4];

For (let i =0; i < array.length; i++)

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

array.splice(i, 1);

}

}

What is the value of array after the code executes?

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

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

[1, 2, 3, 5]

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

14. Which statement phrases successfully?

JSO

parse ( ‘ foo ’ );

JSO

parse ( “ foo ” );

JSO

parse( “ ‘ foo ’ ” );

JSO

parse(‘ “ foo ” ’);

15. Refer to the code below:

Let str = ‘javascript’;

Str[0] = ‘J’;

Str[4] = ’S’;

After changing the string index values, the value of str is ‘javascript’.

What is the reason for this value:

Non-primitive values are mutable.

Non-primitive values are immutable.

Primitive values are mutable.

Primitive values are immutable.

16. Refer to the code below:

Function changeValue(obj) {

Obj.value = obj.value/2;

}

Const objA = (value: 10);

Const objB = objA;

changeValue(objB);

Const result = objA.value;

What is the value of result after the code executes?

Nan

Undefined

17. A developer wrote a fizzbuzz function that when passed in a number, returns the following:

‘Fizz’ if the number is divisible by 3.

‘Buzz’ if the number is divisible by 5.

‘Fizzbuzz’ if the number is divisible by both 3 and 5.

Empty string if the number is divisible by neither 3 or 5.

Which two test cases will properly test scenarios for the fizzbuzz function? Choose 2 answers

let res = fizzbuzz(5); console.assert ( res === ‘ ’ );

let res = fizzbuzz(15); console.assert ( res === ‘ fizzbuzz ’ )

let res = fizzbuzz(Infinity); console.assert ( res === ‘ ’ )

let res = fizzbuzz(3); console.assert ( res === ‘ buzz ’ )

18. Refer to the code below:

01 const server = require(‘server’);

02 /* Insert code here */

A developer imports a library that creates a web server. The imported library uses events and callbacks to start the servers

Which code should be inserted at the line 03 to set up an event and start the web server?

Server.start ();

server.on(‘ connect ’ , ( port) => { console.log(‘Listening on ’ , port) ;})

server()

serve(( port) => (

console.log( ‘Listening on ’, port) ;

19. 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?

super (body, author, viewCount) {

Function Post (body, author, viewCount) {

constructor (body, author, viewCount) {

constructor() {

20. Refer to the code below:

Const resolveAfterMilliseconds = (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?

aPromise and bPromise run sequentially.

Neither aPromise or bPromise runs.

aPromise and bPromise run in parallel.

Only aPromise runs.

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21. Given the code below:

01 function GameConsole (name) {

02 this.name = name;

3 }

4

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

6 console.log( ` $(this.name) is loading a game : $(gamename) …`);

7 )

8 function Console 16 Bit (name) {

9 GameConsole.call(this, name) ;

10 }

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

12 //insert code here

13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) …`);

14 }

15 const console16bit = new Console16bit(‘ SNEGeneziz ’);

16 console16bit.load(‘ Super Nonic 3x Force ’);

What should a developer insert at line 15 to output the following message using the method?

> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .

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

Console16bit.prototype.load = function(gamename) {

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

Console16bit.prototype.load(gamename) {

22. Works in both the browser and Node.js Which meet the requirements?

assert (number % 2 === 0);

console.error(number % 2 === 0);

console.debug(number % 2 === 0);

console.assert(number % 2 === 0);

23. Refer to the code below:

let sayHello = () => {

console.log (‘Hello, world!’);

};

Which code executes sayHello once, two minutes from now?

setTimeout(sayHello, 12000);

setInterval(sayHello, 12000);

setTimeout(sayHello(), 12000);

delay(sayHello, 12000);

24. Which three browser specific APIs are available for developers to persist data between page loads? Choose 3 answers

IIFEs

indexedDB

Global variables

localStorage.

25. Refer to the code below:

Const myFunction = arr => {

Return arr.reduce((result, current) =>{

Return result = current;

}, 10};

}

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

Returns 0

Throws an error

Returns 10

Returns NaN

26. 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?

Hello Dan Doe

Hello John DOe

TypeError: dan.name is not a function

TypeError: Assignment to constant variable.

27. Refer to the code below:

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

02 new Promise(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 );

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

08 }

}

}

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

Async runParallel () .then(data);

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

runParallel () .then(data);

runParallel () .then(function(data) return da

28. 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?

[ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]

[ ‘pizza’,’Burger’, ‘French fires’]

[ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]

[ ‘Garlic bread’]

29. 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?

The z variable is assigned the correct object.

The z variable is assigned the correct object but this.name remains undefined.

Window.name is assigned to ‘hello’ and the variable z remains undefined.

Window.m is assigned the correct object.

30. Refer to 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?

When rejected

When resolved and settled

WHen resolved

When resolved or rejected

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31. Given HTML below:

<div>

<div id =”row-uc”> Universal Container</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?

Document .querySelector(‘#row-uc’).classes.push(‘priority-account’);

Document .queryElementById(‘row-uc’).addclass(‘priority-account’);

Document .querySelector(‘#row-uc’).classList.add(‘priority-account’);

Document .querySelectorALL(‘#row-uc’).classList.add(‘priority-account’);

32. Refer to following code:

class Vehicle {

constructor(plate) {

This.plate =plate;

}

}

Class Truck extends Vehicle {

constructor(plate, weight) {

//Missing code

This.weight = weight;

}

displayWeight() {

console.log(‘The truck ${this.plate} has a weight of ${this.weight} lb.’);}} Let myTruck = new Truck(‘123AB’, 5000); myTruck.displayWeight();

Which statement should be added to line 09 for the code to display ‘The truck 123AB has a weight of 5000lb.’?

Super.plate =plate;

super(plate);

This.plate =plate;

Vehicle.plate = plate;

33. What is the result of the code block?

The console logs only ‘flag’.

The console logs ‘flag’ and another flag.

An error is thrown.

The console logs ‘flag’ and then an error is thrown.

34. Given two expressions var1 and var2.

What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean? Choose 2 answers:

Boolean(var1 && var2)

var1 && var2

var1.toBoolean() && var2toBoolean()

Boolean(var1) && Boolean(var2)

35. 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

The line 02 assertion passes.

The line 02 assertion fails

The line 05 assertion passes.

The line 05 assertion fails.

36. Given the code below:

Setcurrent URL ();

console.log(‘The current URL is: ‘ +url );

function setCurrentUrl() {

Url = window.location.href:

What happens when the code executes?

The url variable has local scope and line 02 throws an error.

The url variable has global scope and line 02 executes correctly.

The url variable has global scope and line 02 throws an error.

The url variable has local scope and line 02 executes correctly.

37. A developer implements a function that adds a few values.

Function sum(num) {

If (num == undefined) {

Num =0;

}

Return function( num2, num3){

If (num3 === undefined) {

Num3 =0 ;

}

Return num + num2 + num3;

}

}

Which three options can the developer invoke for this function to get a return value of 10? Choose 3 answers

Sum () (20)

Sum (5, 5) ()

sum() (5, 5)

sum(5)(5)

sum(10) ()

38. Refer to the following code:

Let obj ={

Foo: 1,

Bar: 2

}

Let output =[],

for(let something in obj{

output.push(something);

}

console.log(output);

What is the output line 11?

[1,2]

[“bar”,”foo”]

[“foo”,”bar”]

[“foo:1”,”bar:2”]

39. A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:

function calculateBill ( items ) {

let total = 0;

total += findSubTotal(items);

total += addTax(total);

total += addTip(total);

return total;

}

Which option allows the developer to step into each function execution within calculateBill?

Using the debugger command on line 05.

Using the debugger command on line 03

Calling the console.trace (total) method on line 03.

Wrapping findSubtotal in a console.log() method.

40. 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.”?

document.querySelectorAll(‘$main $TONY’).innerHTML = ’ Mr.

’;

document.querySelector(‘$main li:second-child’).innerHTML = ’ Mr.

’;

document.querySelector(‘$main li.Tony’).innerHTML = ’ Mr.

’;

document.querySelector(‘$main li:nth-child(2)’),innerHTML = ’ Mr.

’;

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41. A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.

Which two test approaches describe the requirement? Choose 2 answers

Integration

Black box

White box

Mocking

42. Refer to code below:

Function muFunction(reassign){

Let x = 1;

var y = 1;

if( reassign ) {

Let x= 2;

Var y = 2;

console.log(x);

console.log(y);}

console.log(x);

console.log(y);}

What is displayed when myFunction(true) is called?

2 2 1 1

2 2 undefined undefined

2 2 1 2

2 2 2 2

43. Refer to the following code that performs a basic mathematical operation on a provided input:

function calculate(num) {

Return (num +10) / 3;

}

How should line 02 be written to ensure that x evaluates to 6 in the line below?

Let x = calculate (8);

Return Number((num +10) /3 );

Return (Number (num +10 ) / 3;

Return Integer(num +10) /3;

Return Number(num + 10) / 3;

44. 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?

2 1 4 3 5

2 5 1 3 4

1 2 4 3 5

1 2 5 3 4

Salesforce JavaScript Developer I Training Material

Salesforce JavaScript Developer I Training Material

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