Latest JavaScript-Developer-I Practice Test Questions Verified Answers As Experienced in the Actual Test!
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Salesforce JavaScript-Developer-I Exam is a computer-based exam that consists of 60 multiple-choice questions. JavaScript-Developer-I exam is designed to test the candidate's knowledge and skills in various areas of JavaScript development on the Salesforce platform, including data types, variables, operators, flow control, functions, events, and more.
By earning the Salesforce Certified JavaScript Developer I certification, individuals can demonstrate their expertise in developing custom applications on the Salesforce platform using JavaScript. Salesforce Certified JavaScript Developer I Exam certification can enhance a developer’s career opportunities and make them a more valuable asset to their organization. Additionally, Salesforce Certified JavaScript Developer I certification holders are recognized by the industry as experts in the field and are listed on Salesforce’s official website as certified professionals.
Salesforce Certified JavaScript Developer I certification exam is a challenging assessment that evaluates a developer’s knowledge and skills in building custom applications using the Salesforce Lightning platform. JavaScript-Developer-I exam tests a developer’s ability to build custom user interfaces, create custom Lightning components, and use Apex and JavaScript to build custom logic and automation. Salesforce Certified JavaScript Developer I Exam certification is designed for developers who have experience with JavaScript, HTML, and CSS and are familiar with Salesforce’s Lightning Component framework.
NEW QUESTION # 117
Refer to the code below:
A developer import a library that creates a web server. the imported library uses events and callback to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?
- A. Server. on ('connet' , (port) => (
Console.log (Listening on' port);
}}; - B. server ( (port) => (
Console.log ('Listening on' , port) ;
}}; - C. server( );
- D. Server .start();
Answer: B
NEW QUESTION # 118
Given the code below:
Function myFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?
- A. Both lines 08 and 09 are executed, but values outputted are undefined.
- B. Both lines 08 and 09 are executed, and the variables are outputted.
- C. Line 08 thrones an error, therefore line 09 is never executed.
- D. Line 08 outputs the variable, but line 09 throws an error.
Answer: D
NEW QUESTION # 119
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)
- A. Option C
- B. Option D
- C. Option A
- D. Option B
Answer: D
NEW QUESTION # 120
A developer removes the HTML class attributes from the check button, so now it is simply:
<button>checkout<button>.
There is a test verify the existence of the checkout button, however it look for a button with class'' blue''. The test fails because no such button is f.
Which type of test category describes this test?
- A. False negative
- B. True negative
- C. True positive
- D. False positive
Answer: C
NEW QUESTION # 121
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.'?
- A. This.plate =plate;
- B. super(plate);
- C. Vehicle.plate = plate;
- D. Super.plate =plate;
Answer: B
NEW QUESTION # 122
Refer the code below.
x=3.14;
function myfunction() {
"use strict";
y=x;
}
z=x;
myFunction();
Answer:
Explanation:
Z is equal to 3.14
Use strict has effect only on line 5.
Line 5 throws an error
NEW QUESTION # 123
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Hello and salutation is I say hello.
- B. Greeting is Hello and salutation is Hello, Hello.
- C. Greeting is Goodbye and salutation is Hello, Hello.
- D. Greeting is Goodbye and salutation is I say Hello.
Answer: B
NEW QUESTION # 124
Given the code below:
Which method can be used to provide a visual representation of the list of users and to allow sorting by the name or email attribute?
- A. console.table(usersList) ;
- B. console.groupCol lapsed (usersList) ;
- C. console.group(usersList) ;
- D. console.info(usersList) ;
Answer: C
NEW QUESTION # 125
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?
- A. [ 'Garlic bread' , 'pizza','Burger', 'French fires' ]
- B. [ 'pizza','Burger', 'French fires', 'Garlic bread']
- C. [ 'Garlic bread']
- D. [ 'pizza','Burger', 'French fires']
Answer: D
NEW QUESTION # 126
Refer of the string below:
Const str = 'sa;esforce'=;
Which two statement result in the word 'Sale'?
Choose 2 answers
- A. str, substr(0,5) ;
- B. str, substr(1,5) ;
- C. str, substring(1,5) ;
- D. str, substring (0,5) ;
Answer: A,D
NEW QUESTION # 127
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?
- A. const https =require('https');
- B. const tls = require('tls');
- C. const http =require('http');
- D. const server =require('secure-server');
Answer: A
NEW QUESTION # 128
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to theserver Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?
- A. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR',error); };}
- B. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
- C. ws.on ('connect', ( ) => {console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' ,error); });});
- D. ws.connect (( ) => {console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
Answer: C
NEW QUESTION # 129
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?
- A. 2.0.0
- B. 1.2.0
- C. 1.2.3
- D. 1.1.4
Answer: B
NEW QUESTION # 130
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 to make this code work as expected?
- A. Replace line 02 with button.addEventListener("onclick", function() {
- B. Replace line 02 with button.addCallback("click", function() {
- C. Replace line 03 with const input = document.getElementByName('input');
- D. Replace line 04 with console.log(input .value);
Answer: D
NEW QUESTION # 131
Refer to the code snippet:
A developer writes this code to return a message to a user attempting to register a new username. If the username is available, a variable named msg is declared and assigned a value on line 03.
What is the return of msg when getivelibilityMessage ('' bewUserName') is executed and getAvailability (''newUserName'') returns false?
- A. ''Username available''
- B. ''newUsername''
- C. ''msg is not defined''
- D. undefined
Answer: D
NEW QUESTION # 132
A developer wants to set up a secure web server with Node.js. The developer create 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?
- A. Const http = require ('https') ;
- B. Const tls = require ('tls') ;
- C. Const http = require ('http');
- D. Const server = require ( 'secure-server') ;
Answer: A
NEW QUESTION # 133
Universal Container(UC) just launched a new landing page, but users complain that the
website is slow. A developer found some functions that cause this problem. To verify this, the
developer decides to do everything and log the time each of these three suspicious functions
consumes.
console.time('Performance');
maybeAHeavyFunction();
thisCouldTakeTooLong();
orMaybeThisOne();
console.endTime('Performance');
Which function can the developer use to obtain the time spent by every one of the three
functions?
- A. console.timeStamp()
- B. console.trace()
- C. console.timeLog()
- D. console.getTime()
Answer: C
NEW QUESTION # 134
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
- A. May 10, 2020
- B. October 05, 2020
- C. June 10, 2020
- D. November 05, 2020
Answer: C
NEW QUESTION # 135
Which statement accurately describes the behaviour of the async/ await keyworks ?
- A. The associated function can only be called via asynchronous methods
- B. The associated function will always return a promise
- C. The associated class contains some asynchronous functions.
- D. The associated sometimes returns a promise.
Answer: B
NEW QUESTION # 136
Consider type coercion, what does the following expression evaluate to?
True + 3 + '100' + null
- A. 0
- B. '4100null'
- C. 1
- D. '3100null'
Answer: B
NEW QUESTION # 137
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:
All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.
- A. Use the browser to execute a script that removes all the element containing the class ad-library-item.
- B. Use the browser console to execute a script that prevents the load event to be fired.
- C. Use the DOM inspector to prevent the load event to be fired.
- D. Use the DOM inspector to remove all the elements containing the class ad-library-item.
Answer: A
NEW QUESTION # 138
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?
- A. Info
- B. Message
- C. Assert
- D. Error
- E. Log
Answer: A,C,E
NEW QUESTION # 139
A developer is leading the creation of a new browser application that will serve a single
page application. The team wants to use a new web framework Minimalsit.js. The Lead
developer wants to advocate for a more seasoned web framework that already has a
community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers
- A. Koa
- B. Angular
- C. Express
- D. Vue
Answer: B,C
NEW QUESTION # 140
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