ITexamReview JavaScript-Developer-I Real Exam Question Answers Updated [Apr 10, 2023]
Easily To Pass New Salesforce JavaScript-Developer-I Dumps with 225 Questions
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NEW QUESTION 104
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 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 . . .
- A. Console16bit = Object.create(GameConsole.prototype).load = function
(gamename) { - B. Console16bit.prototype.load(gamename) {
- C. Console16bit.prototype.load = function(gamename) {
- D. Console16bit.prototype.load(gamename) = function() {
Answer: C
NEW QUESTION 105
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
- A. 'Update' , '123abc'
- B. 'Update' , {
Details : {
recordId : '123abc'
}
} - C. { type : 'update', recordId : '123abc' }
- D. 'Update' , (
recordId : '123abc'
(
Answer: B,D
NEW QUESTION 106
Given the JavaScript below:
Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?
- A. 'Hidden, visible
- B. 'Block' : 'none'
- C. 'None' : 'block'
- D. 'Visible : 'hidden'
Answer: B
NEW QUESTION 107
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 function previewFile(){
02 const preview = document.querySelector('img');
03 const file = document.querySelector('input[type=file]').files[0];
04 //line 4 code
05 reader.addEventListener("load", () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local
computer , and to display the image in the browser?
- A. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file); - B. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file); - C. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file); - D. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
Answer: A
NEW QUESTION 108
Which two options are core Node.js modules?
Choose 2 answers
- A. exception
- B. isotream
- C. worker
- D. http
Answer: B,D
NEW QUESTION 109
A developer is asked to fix some bugs reported by users. To do that, the developer adds a breakpoint for debugging.
Function Car (maxSpeed, color){
This.maxspeed =masSpeed;
This.color = color;
Let carSpeed = document.getElementById(' CarSpeed');
Debugger;
Let fourWheels =new Car (carSpeed.value, 'red');
When the code execution stops at the breakpoint on line 06, which two types of information are available in the browser console ?
Choose 2 answers:
- A. The information stored in the window.localStorage property
- B. The values of the carSpeed and fourWheels variables
- C. A variable displaying the number of instances created for the Car Object.
- D. The style, event listeners and other attributes applied to the carSpeed DOM element
Answer: A,D
NEW QUESTION 110
Which statement parses successfully?
- A. JSON.parse (''foo '');
- B. JSON.parse ('' 'foo' '');
- C. JSON.parse ('' 'foo'' ');
- D. JSON.parse ('foo ');
Answer: A
NEW QUESTION 111
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is executed and getAvailability("newUserName") returns false?
- A. "newUserName"
- B. "Msg is not defined"
- C. "Username available"
- D. undefined
Answer: D
NEW QUESTION 112
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 the server
● 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. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
}); - B. try{
ws.connect (( ) => {
console.log('connected to client'); }); - C. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }}; - D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
Answer: D
Explanation:
} catch(error) { console.log('ERROR' , error); };
}
NEW QUESTION 113
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated to false?
- A. Let x = (1' + '2') == (6 + 2) ;
- B. Let x = (1' + '2') === (6 + 2) ;
- C. Let x = (1' + '2') === (6 / 2) ;
- D. Let x = (1' + '2') == ('6' / 2) ;
Answer: B
NEW QUESTION 114
Refer to the code below:
Which two statements correctly execute the runparallel () function?
Choose 2 answers
- A. Async runParalled (). Then (data) :
- B. runParallel () , done (function ( data)(return data; }};
- C. runParralel () . then (data );
- D. runParallel () , then (function ) (date) { } 0;
Answer: A,D
NEW QUESTION 115
A developer publishes a new version of a package with new feature 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. 1.1.4
- B. 1.2.3
- C. 2.0.0
- D. 1.2.0
Answer: D
NEW QUESTION 116
Refer to the following object.
How can a developer access the fullName property for dog?
- A. Dog, get, fullName
- B. Dog, function, fullName
- C. Dog.fullName ( )
- D. Dog.fullName
Answer: D
NEW QUESTION 117
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?
- A. Nan
- B. 0
- C. Undefined
- D. 1
Answer: B
NEW QUESTION 118
Refer to the code below:
What is the output after the ode executes successfully?
- A. Start
End
Success - B. End
Start
Success - C. Start
Success
End - D. Success
Start
End
Answer: C
NEW QUESTION 119
Refer to the following code block:
What is the console output?
- A. > Jackie got 70% on test.
- B. > Better student Jackie got 70% on test.
- C. > Uncaught Reference Error
- D. > Better student Jackie got 100% on test.
Answer: B
NEW QUESTION 120
Refer to the code below:
What is the value of foobDienu1 after the code executes?
- A. {'Garlic bread', Pizza' , Burger' , French fries'}
- B. {'Garlic bread'}
- C. {'Pizza' , Burger' , French fries ' , garlic bread; }
- D. {'Pizza' , Burger' , French fries '}
Answer: C
NEW QUESTION 121
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