JavaScript-Developer-I Salesforce Certified JavaScript Developer I (SU24) Questions and Answers

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 ?

Given the following code:

Let x =null;

console.log(typeof x);

What is the output of the line 02?

Refer to the HTML below:

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

Given the following code, what is the value of x?

let x = ‘15' + (10 * 2);

Which three browser specific APIs are available for developers to persist data between page loads ?

Choose 3 answers

A developer wants to use a module called DataPrettyPrint. This module exports one default function called printDate ().

How can a developer import and use the printDate() function?

A)

B)

C)

D)

Which code change should be done for the console to log the following when 'Click me!' is clicked'

> Row log

> Table log

Refer the code below.

x=3.14;

function myfunction() {

"use strict";

y=x;

}

z=x;

myFunction();

A developer writes the code below to calculate the factorial of a given number

function sum(number){

return number * sum(number-1);

}

sum(3);

what is the result of executing the code.

Refer to the following array:

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

Which three options result in x evaluating as [1, 2]?

Choose 3 answer

A developer copied a JavaScript object:

How does the developer access dan's forstName,lastName? Choose 2 answers

Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

Given the code below:

Which three code segments result in a correct conversion from number to string? Choose 3 answers

Given the following code:

is the output of line 02?

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*/;

06 )};

07 }

Which code should replace the placeholder comment on line 05 to hide accounts that do

not match the search string?

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 developer at Universal Containers creates a new landing page based on HTML, CSS, and

JavaScript TO ensure that visitors have a good experience, a script named personaliseContext

needs to be executed when the webpage is fully loaded (HTML content and all related files ), in

order to do some custom initialization.

Which statement should be used to call personalizeWebsiteContent based on the above

business requirement?

A developer writes the code below to return a message to a user attempting to register a new username. If the username is available, a variable named nag is declared and assigned a value on line 03.

What is the value of msg when getAvailableabilityMessage (“newUserName”) is executed and get Availability (“newUserName”) returns true?

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

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?

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?

Which statement can a developer apply to increment the browser's navigation history without a page refresh?

Which statement can a developer apply to increment the browser's navigation history without a page refresh?

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 replace line 01 and declare the function for use?

Choose 2 answers

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?

A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.

What is the correct implementation of the try...catch?

A)

B)

C)

D)

developer removes the HTML class attribute from the checkout button, so now it is

simply:

Checkout.

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?

Which three statements are true about promises ?

Choose 3 answers

A developer initiates a server with the file 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?

Refer to the code below:

function foo () {

const a =2;

function bat() {

console.log(a);

}

return bar;

}

Why does the function bar have access to variable a ?

Refer to the code below:

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