Salesforce JavaScript Developer I

Question 1

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:

Accepted Answer

Primitive values are immutable.

Answer

Non-primitive values are mutable.

Answer

Non-primitive values are immutable.

Answer

Primitive values are mutable.

Question 2

2. What are two unique features of functions defined with a fat arrow as compared to normal function definition? Choose 2 answers

Accepted Answer

The function generated its own this making it useful for separating the function’s scope from its enclosing scope.

Accepted Answer

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

Answer

The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

Answer

The function uses the this from the enclosing scope.

Question 3

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

Accepted Answer

‘Update’ , (
recordId : ‘123abc’
(

Accepted Answer

‘Update’ , {
Details : {
recordId : ‘123abc’
}
}

Answer

correct
‘Update’ , ‘123abc’
{ type : ‘update’, recordId : ‘123abc’ }

Question 4

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?

Accepted Answer

TypeError: dan.name is not a function

Answer

Hello Dan Doe

Answer

Hello John DOe

Answer

TypeError: Assignment to constant variable

Question 5

Refer to the code below:

catch( arr => (

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

11 ));

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

Accepted Answer

Car 2 completed the race.

Answer

Car 3 completed the race.

Answer

Car 1 crashed in the race.

Answer

Race is cancelled.

Question 6

Given the code below:

Function myFunction(){

A =5; Var b =1;

}

myFunction();

console.log(a);

console.log(b);

What is the expected output?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 7

Refer to the following code:

function test (val) {

If (val === undefined) {

return ‘Undefined values!’ ;

}

if (val === null) {

return ‘Null value! ’;

}

return val;

}

Let x;

test(x);

What is returned by the function call on line 13?

Accepted Answer

Undefined

Answer

Line 13 throws an error.

Answer

‘Undefined values!’

Answer

‘Null value!’

Question 8

CORRECT TEXT

Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
A)

B)

C)

D)

Accepted Answer

Option A

Answer

Option B

Answer

Option C

Answer

Option D

Question 9

Refer to the code below:

Async funct on functionUnderTest(isOK) {

If (isOK) return ‘OK’ ;

Throw new Error(‘not OK’);

)

Which assertion accuretely tests the above code?

Accepted Answer

Console.assert (await functionUnderTest(true), ‘OK’)

Answer

Console.assert (await functionUnderTest(true), ‘ OK ’)

Answer

Console.assert (await functionUnderTest(true), ‘ not OK ’)

Answer

Console.assert (await functionUnderTest(true), ‘not OK’)

Question 10

Which two code snippets show working examples of a recursive function? Choose 2 answers

Accepted Answer

Let countingDown = function(startNumber) { If ( startNumber >0) { console.log(startNumber) ; return countingDown(startNUmber); } else { return startNumber; }};

Accepted Answer

Const factorial =numVar => { If (numVar < 0) return; If ( numVar === 0 ) return 1; return numVar * factorial ( numVar - 1 ); };

Answer

Function factorial ( numVar ) { If (numVar < 0) return; If ( numVar === 0 ) return 1; return numVar -1;

Answer

Const sumToTen = numVar => { If (numVar < 0) Return; return sumToTen(numVar + 1)};

Question 11

Refer to the HTML below:

Leo
Tony
Tiger

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

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 12

Universal Containers (UC) notices that its application that allows users to search for accounts makes a network request each time a key is pressed. This results in too many requests for the server to handle.

Address this problem, UC decides to implement a debounce function on string change handler.

What are three key steps to implement this debounce function? Choose 3 answers:

Accepted Answer

If there is an existing setTimeout and the search string change, allow the existing setTimeout to finish, and do not enqueue a new setTimeout.

Accepted Answer

When the search string changes, enqueue the request within a setTimeout.

Accepted Answer

Ensure that the network request has the property debounce set to true.

Answer

If there is an existing setTimeout and the search string changes, cancel the existing setTimeout using the persisted timerId and replace it with a new setTimeout.

Answer

Store the timeId of the setTimeout last enqueued by the search string change handle.

Question 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?

Accepted Answer

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

Answer

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

Answer

[1, 2, 3, 5]

Answer

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

Question 14

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?

Accepted Answer

2 5 1 3 4

Answer

2 1 4 3 5

Answer

1 2 4 3 5

Answer

1 2 5 3 4

Question 15

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:

Accepted Answer

Boolean(var1 && var2)

Accepted Answer

Boolean(var1) && Boolean(var2)

Answer

var1 && var2

Answer

var1.toBoolean() && var2toBoolean()

Question 16

Refer to the code below:

console.log(‘’start);

Promise.resolve(‘Success’) .then(function(value){

console.log(‘Success’);

});

console.log(‘End’);

What is the output after the code executes successfully?

Accepted Answer

Start End Success

Answer

End

Answer

Start Success

Answer

Start Success End

Answer

Success Start

Question 17

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

Accepted Answer

const retrieveFromLocalStorage = (storageKey) =>{ return JSON.parse(window.localStorage.getItem(storageKey)); }

Answer

const retrieveFromLocalStorage = () =>{ return JSON.stringify(window.localStorage.getItem(storageKey)); }

Answer

const retrieveFromLocalStorage = (storageKey) =>{ return window.localStorage.getItem(storageKey); }

Answer

const retrieveFromLocalStorage = (storageKey) =>{ return window.localStorage[storageKey]; }

Question 18

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?

Accepted Answer

Neither aPromise or bPromise runs.

Answer

aPromise and bPromise run sequentially.

Answer

aPromise and bPromise run in parallel.

Answer

Only aPromise runs.

Question 19

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?

Accepted Answer

const https =require(‘https’);

Answer

const server =require(‘secure-server’);

Answer

const tls = require(‘tls’);

Answer

const http =require(‘http’);

Question 20

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);

Accepted Answer

Return (Number (num +10 ) / 3;

Answer

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

Answer

Return Integer(num +10) /3;

Answer

Return Number(num + 10) / 3;

Question 21

A developer wrote the following code:

01 let X = object.value;

02

03 try {

4 handleObjectValue(X);

5 } catch (error) {

6 handleError(error);

7 }

The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.

How can the developer change the code to ensure this behavior?

Accepted Answer

03 try { 4 handleObjectValue(x) 5 ……………………

Answer

03 try{ 4 handleObjectValue(x); 5 } catch(error){ 6 handleError(error); 7 } then { 8 getNextValue(); 9 }

Answer

03 try{ 4 handleObjectValue(x); 5 } catch(error){ 6 handleError(error); 07 } finally { 8 getNextValue(); 10 }

Answer

03 try{ 4 handleObjectValue(x); 5 } catch(error){ 6 handleError(error); 7 } 8 getNextValue();

Question 22

Which code statement below correctly persists an objects in local Storage?

Accepted Answer

const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSO
stringify(jsObject)); }

Answer

const setLocalStorage = ( jsObject) => { window.localStorage.connectObject(jsObject)); }

Answer

const setLocalStorage = ( jsObject) => { window.localStorage.setItem(jsObject); }

Answer

const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject); }

Question 23

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” : “user01@universalcontainers.demo”,

04 “age” : 25

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

Accepted Answer

userInformation(“email”)

Accepted Answer

userInformation.email

Answer

userInformation.get(“email”)

Answer

userInformation(email)

Question 24

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?

Accepted Answer

0 1 1 2

Answer

0 0 1 2

Answer

0 1 2 3

Answer

0 1 2 2

Question 25

developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.

Following semantic versioning format, what should the new package version number be?

Accepted Answer

1.2.0

Answer

2.0.0

Answer

1.2.3

Answer

1.1.4

Question 26

A developer has an ErrorHandler module that contains multiple functions.

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

Accepted Answer

Named

Answer

All

Answer

Multi

Answer

Default

Question 27

Refer to the code below:

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

Which two statements result in the array [1, 2, 3, 4, 5]? Choose 2 answers

Accepted Answer

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

Accepted Answer

[ ]. Concat (... inArray);correct

Answer

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

Answer

[ ]. concat ( [ ….inArray ] );

Question 28

Refer to code below:

Let productSKU = ‘8675309’ ;

A developer has a requirement to generate SKU numbers that are always 19 characters lon,

starting with ‘sku’, and padded with zeros.

Which statement assigns the values sku0000000008675309?

Accepted Answer

productSKU = productSKU.padStart (16. ‘0’).padstart(19, ‘sku’);

Answer

productSKU = productSKU.padStart (19. ‘0’).padstart(‘sku’);

Answer

productSKU = productSKU.padEnd (16. ‘0’).padstart(‘sku’)

Answer

productSKU = productSKU.padEnd (16. ‘0’).padstart(19, ‘sku’);

Question 29

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 result of executing line 04?

Accepted Answer

RuntimeError

Answer

0

Answer

6

Answer

-Infinity

Question 30

Refer to the following code:

01 function Tiger(){

02 this.Type = ‘Cat’;

03 this.size = ‘large’;

04 }

05

06 let tony = new Tiger();

07 tony.roar = () =>{

08 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 //Insert code here

18 leo.roar();

Accepted Answer

Leo.roar = () => { console.log(‘They’re pretty good:’); };

Accepted Answer

Object.assign(leo,tony);

Answer

Object.assign(leo,Tiger);

Answer

Leo.prototype.roar = () => { console.log(‘They’re pretty good:’); };

Question 31

developer wants to use a module named universalContainersLib and them call functions from it.

How should a developer import every function from the module and then call the fuctions foo and bar?

Accepted Answer

import * ad lib from ‘/path/universalContainersLib.js’; lib.foo(); lib.bar();

Answer

import (foo, bar) from ‘/path/universalContainersLib.js’; foo(); bar();

Answer

import all from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();

Answer

import * from ‘/path/universalContaineraLib.js’; universalContainersLib.foo(); universalContainersLib.bar();

Question 32

A developer creates a generic function to log custom messages in the console.

To do this, the function below is implemented.

01 function logStatus(status){

02 console./*Answer goes here*/{‘Item status is: %s’, status};

03 }

Which three console logging methods allow the use of string substitution in line 02?

Accepted Answer

Assert

Accepted Answer

Info

Answer

Log

Answer

Message

Answer

Error

Question 33

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?

Accepted Answer

Using the debugger command on line 05

Answer

Using the debugger command on line 03

Answer

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

Answer

Wrapping findSubtotal in a console.log() method

Question 34

A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?

Which two promises are rejected?

Which 2 are correct?

Accepted Answer

Promise.reject(‘cool error here’).catch(error => console.error(error));

Accepted Answer

New Promise((resolve, reject) => (throw ‘cool error here’}).catch(error => console.error(error)) ;

Answer

Promise.reject(‘cool error here’).then(error => console.error(error));

Answer

New Promise(() => (throw ‘cool error here’}).then(null, error => console.error(error)));

Question 35

A 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 for a button with class= “blue”. The test fails because no such button is found.

Which type of test category describes this test?

Accepted Answer

False negative

Answer

True positive

Answer

True negative

Answer

False positive

Question 36

A developer creates an object where its properties should be immutable and prevent

properties from being added or modified.

Which method should be used to execute this business requirement?

Accepted Answer

Object.freeze()

Answer

Object.const()

Answer

Object.eval()

Answer

Object.lock()

Question 37

Refer to the code below:

Const searchTest = ‘Yay! Salesforce is amazing!” ;

Let result1 = searchText.search(/sales/i);

Let result 21 = searchText.search(/sales/i);

console.log(result1);

console.log(result2);

After running this code, which result is displayed on the console?

Accepted Answer

5 >undefined

Answer

true > false

Answer

5 > -1

Answer

5 > 0

Question 38

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?

Accepted Answer

5

Answer

10

Answer

Nan

Answer

Undefined

Question 39

A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed.

The developer needs to find what is missing in the code below.

Const sumFunction = arr => {

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

//

Result += current;

//

), 10);

);

Which option makes the code work as expected?

Accepted Answer

Replace line 05 with return result;

Answer

Replace line 02 with return arr.map(( result, current) => (

Answer

Replace line 04 with result = result +current;

Answer

Replace line 03 with if(arr.length == 0 ) ( return 0; )

Question 40

The developer wants to test the array shown:

const arr = Array(5).fill(0)

Which two tests are the most accurate for this array? Choose 2 answers:

Accepted Answer

console.assert( arr.length === 5 );

Accepted Answer

arr.forEach(elem => console.assert(elem === 0)) ;

Answer

console.assert(arr[0] === 0 && arr[ arr.length] === 0);

Answer

console.assert (arr.length >0);

Question 41

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?

Accepted Answer

[“foo”,”bar”]

Answer

[1,2]

Answer

[“bar”,”foo”]

Answer

[“foo:1”,”bar:2”]

Question 42

In which situation should a developer include a try .. catch block around their function call?

Accepted Answer

The function might raise a runtime error that needs to be handled.

Answer

The function has an error that should not be silenced.

Answer

The function results in an out of memory issue.

Answer

The function contains scheduled code.

Question 43

Which three statements are true about promises? Choose 3 answers

Accepted Answer

A Promise has a .then() method.

Accepted Answer

A fulfilled or rejected promise will not change states .

Accepted Answer

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

Answer

The executor of a new Promise runs automatically.

Answer

A settled promise can become resolved.

Question 44

Which statement accurately describes the behaviour of the async/ await keyworks?

Accepted Answer

The associated function will always return a promise

Answer

The associated class contains some asynchronous functions.

Answer

The associated function can only be called via asynchronous methods

Answer

The associated sometimes returns a promise.

Question 45

Refer to code below:

Let first = ‘who’;

Let second = ‘what’;

Try{

Throw new error(‘Sad trombone’);

}catch (err){

First =’Why’;

}finally {

Second =’when’;

} catch (err) { Second =’Where’;

}

What are the values for first and second once the code executes?

Accepted Answer

First is why and second is when

Answer

First is Who and second is When

Answer

First is why and second is where

Answer

First is who and second is where

Question 46

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?

Accepted Answer

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

Answer

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

Answer

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

Answer

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

Question 47

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

Accepted Answer

sum() (5, 5)

Accepted Answer

sum(5)(5)

Answer

Sum () (20)

Answer

Sum (5, 5) ()

Answer

sum(10) ()

Question 48

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?

Accepted Answer

Class ClothingItem extends Item {

Answer

Class ClothingItem implements Item{

Answer

Class ClothingItem {

Answer

Class ClothingItem super Item {

Question 49

A developer needs to test this function:

01 const sum3 = (arr) => (

02 if (!arr.length) return 0,

03 if (arr.length === 1) return arr[0],

04 if (arr.length === 2) return arr[0] + arr[1],

05 return arr[0] + arr[1] + arr[2],

06 );

Which two assert statements are valid tests for the function? Choose 2 answers

Accepted Answer

console.assert(sum3(1, ‘2’)) == 12);

Accepted Answer

console.assert(sum3(-3, 2 )) == -1);

Answer

console.assert(sum3(0)) == 0);

Answer

console.assert(sum3(‘hello’, 2, 3, 4)) === NaN);

Question 50

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 alert ( ‘Hey! I am John Doe’) ;

03 button.addEventListener (‘click’, listen);

Which two code lines make this code work as required? Choose 2 answers

Accepted Answer

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

Accepted Answer

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

Answer

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

Answer

On line 04, use event.stopPropagation ( ),

Question 51

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 . . .

Accepted Answer

Console16bit.prototype.load = function(gamename) {

Answer

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

Answer

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

Answer

Console16bit.prototype.load(gamename) {

Question 52

developer is trying to convince management that their team will benefit from using Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.

Which three benefits of Node.js can the developer use to persuade their manager? Choose 3 answers:

Which three benefits of Node.js can the developer use to persuade their manager? Choose 3 answers:

Accepted Answer

I nstalls with its own package manager to install and manage third-party libraries.

Accepted Answer

Performs a static analysis on code before execution to look for runtime errors.

Accepted Answer

User non blocking functionality for performant request handling.

Answer

Ensures stability with one major release every few years.

Answer

Executes server-side JavaScript code to avoid learning a new language.

Question 53

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

Accepted Answer

canTalk

Accepted Answer

Type

Accepted Answer

Size

Answer

Name

Answer

Owner

Question 54

Refer to following code block:

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

Let output =0;

For (let num of array){

if (output >0){

Break;

}

if(num % 2 == 0){

Continue;

}

Output +=num;

What is the value of output after the code executes?

Accepted Answer

16

Answer

36

Answer

11

Answer

25

Question 55

Given the following code:

document.body.addEventListener(‘ click ’, (event) => {

if (/* CODE REPLACEMENT HERE */) {

console.log(‘button clicked!’);

)

});

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

Accepted Answer

event.target.nodeName == ‘BUTTON’

Answer

Event.clicked

Answer

e.nodeTarget ==this

Answer

button.addEventListener(‘click’)

Question 56

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

Which two test approaches describe the requirement? Choose 2 answers

Accepted Answer

White box

Accepted Answer

Mocking

Answer

Integration

Answer

Black box

Question 57

Given the code below:

const copy = JSON.stringify([ new String(‘ false ’), new Bollean( false ), undefined ]);

What is the value of copy?

Accepted Answer

-- [ ”false” ,false, null ]--

Answer

-- [ ”false” , { } ]--

Answer

-- [ false, { } ]--

Answer

-- [ ”false” , false, undefined ]--

Salesforce JavaScript Developer I

Fragen in diesem Quiz (57)

Informationen

Feedback

Wie gefällt dir das neue Design?