Free Salesforce Javascript-Developer-I Exam Questions

Become Salesforce Certified with updated Javascript-Developer-I exam questions and correct answers

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Total 217 Questions | Updated On: Jan 27, 2025

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Question 1

Refer to the 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 missing code for the code to display 'The truck 123AB has a

weight of 5000lb.

A : per(plate)

B : per.plate = plate

C : hicle.plate = plate

D : is.plate = plate

Answer: A

Question 2

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?

A : per (body, author, viewCount) {

B : nction Post (body, author, viewCount) {

C : nstructor (body, author, viewCount) {

D : nstructor() {

Answer: C

Question 3

What is the result of the code block?

A : console logs only 'flag'.

B : console logs 'flag' and another flag.

C : error is thrown.

D : console logs 'flag' and then an error is thrown.

Answer: D

Question 4

Given the code below:

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

What is the value of copy?

A : -- [ \''false\'' , { } ]--

B : -- [ false, { } ]--

C : -- [ \''false\'' , false, undefined ]--

D : -- [ \''false\'' ,false, null ]--

Answer: D

Question 5

A developer creates a simple webpage with an input field. When a user enters text in

the input field and clicks the button, the actual value of the field must be displayed in the

console.

Here is the HTML file content:

< input type ='' text'' value=''Hello'' name =''input'' >

< button type =''button'' >Display < /button >

The developer wrote the javascript code below:

Const button = document.querySelector('button');

button.addEvenListener('click', () => (

Const input = document.querySelector('input');

console.log(input.getAttribute('value'));

When the user clicks the button, the output is always ''Hello''.

What needs to be done make this code work as expected?

A : place line 04 with console.log(input .value);

B : place line 03 with const input = document.getElementByName('input');

C : place line 02 with button.addEventListener(''onclick'', function() {

D : place line 02 with button.addCallback(''click'', function() {

Answer: A

Page: 1 / 44

Total 217 Questions | Updated On: Jan 27, 2025

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