2023 Correct and Up-to-date Salesforce JavaScript-Developer-I BrainDumps
Current JavaScript-Developer-I dumps Preparation through Our Practice Test
NEW QUESTION 46
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers
- A. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
- B. The function uses the this from the enclosing scope.
- C. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.
- D. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
Answer: A,D
NEW QUESTION 47
A developer implements a function that adds a few values.
Which three options can the developer invoke for this function to get a return vale of 10? Choose 3 answers
- A. Sum () (5, 5)
- B. Sum (5, 5) ()
- C. Sum (5) (5)
- D. Sum (10) ()
- E. Sum () (10)
Answer: A,C,E
NEW QUESTION 48
Given the following code:
What is the output of line 02?
- A. 'object"
- B. "null"
- C. "x-
- D. "undefined" 0
Answer: A
NEW QUESTION 49
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 ws.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment show the correct way to set up a client two events that listen at execution time?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: A
NEW QUESTION 50
Given the JavaScript below:
Which code should replace the placeholder comment on line 05 to highlight accounts that match the search string'
- A. 'none1 : "yellow'
- B. 'yellow' : null
- C. null : 'yellow'
- D. 'yellow : 'none'
Answer: D
NEW QUESTION 51
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. Angular
- B. Koa
- C. Vue
- D. Express
Answer: A,D
NEW QUESTION 52
Refer to the code below:
What is the value of foobDienu1 after the code executes?
- A. {'Garlic bread', Pizza' , Burger' , French fries'}
- B. {'Pizza' , Burger' , French fries '}
- C. {'Garlic bread'}
- D. {'Pizza' , Burger' , French fries ' , garlic bread; }
Answer: D
NEW QUESTION 53
A developer has two ways to write a function:
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A and Option B?
- A. 1000 growl methods are created for Option A. 1 growl method is created for Option B.
- B. 1 growl method is created regardless of which option is used.
- C. 1 growl method is created for Option A. 1000 growl methods are created for Option B.
- D. 1000 growl methods are created regardless of which option is used.
Answer: A
NEW QUESTION 54
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" : "[email protected]",
04 "age" : 25
Which two options access the email attribute in the object?
Choose 2 answers
- A. userInformation("email")
- B. userInformation.email
- C. userInformation.get("email")
- D. userInformation(email)
Answer: A,B
NEW QUESTION 55
Given the following code:
Let x = ('15' +10) +2;
What is the value of x?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION 56
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
- A. 50
80
72 - B. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80 - C. 50
80
Uncaught Reference Error:this,discount is undefined
72 - D. 50
80
50
72
Answer: D
NEW QUESTION 57
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".
What can the developer do to change the code to print "Hello World" ?
- A. Change line 9 to sayHello(world) ();
- B. Change line 5 to function world ( ) {
- C. Change line 2 to console.log('Hello' , name() );
- D. Change line 7 to ) () ;
Answer: C
NEW QUESTION 58
Refer to the code below:
Why does the function bar have access to variable =?
- A. Prototype chain
- B. Hoisting
- C. Outer function's scope
- D. Inner function's scope
Answer: D
NEW QUESTION 59
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?
- A. Start
End
Success - B. End
Start
Success - C. Start
Success
End - D. Success
Start
End
Answer: A
NEW QUESTION 60
Refer the following code
what is the value of array after code executes?
- A. [ 1, 2, 3, 5 ]
Answer: A
NEW QUESTION 61
The developer wants to test the array shown:
Const arr = Array (5) . fill (0);
Which two test are the most accurate for this array? Choose 2 answers
- A. Console. Assert (arr. Length > 0) ;
- B. Console,assert(arr.length === 5) ;
- C. Arr. forEach (elem => console .assert (elem === 0) );
- D. Console,assert(arr(0) === 0 $$ arr (arr .longth ) === 0) ;
Answer: C
NEW QUESTION 62
A developer receives a comment from the Tech Lead that the code given below has
error:
const monthName = 'July';
const year = 2019;
if(year === 2019) {
monthName = 'June';
}
Which line edit should be made to make this code run?
- A. 03 if (year == 2019) {
- B. 01 let monthName ='July';
- C. 02 let year =2019;
- D. 02 const year = 2020;
Answer: B
NEW QUESTION 63
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?
- A. 0 1 1 2
- B. 0 1 2 2
- C. 0 0 1 2
- D. 0 1 2 3
Answer: A
NEW QUESTION 64
Given the code below:
Setcurrent URL ();
console.log('The current URL is: ' +url );
function setCurrentUrl() {
Url = window.location.href:
What happens when the code executes?
- A. The url variable has local scope and line 02 executes correctly.
- B. The url variable has local scope and line 02 throws an error.
- C. The url variable has global scope and line 02 executes correctly.
- D. The url variable has global scope and line 02 throws an error.
Answer: C
NEW QUESTION 65
Universal Containers recently its new landing page to host crowd-function 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 included the same ad-library-item class. They are hidden by default, and they are randomly displayed while the user navigation through the page.
Tired of all the ads, what can the developer do to temporarily and quickly remove them?
- A. Use the browser console to execute a script that removes all the elements containing the class ad-library-item.
- B. Use the DOM inspector to remove all the elements containing the call ad-library -item.
- C. Use the browser console to execute a script that prevents the load event to be fired.
- D. Use the DOM inspector to prevent the load event to be fired.
Answer: A
NEW QUESTION 66
Given the code block below:
What should a developer insert line 15 to output the following message using the load method?
SNENneziz is loading a cartridge game: super Monic 3x Force...
- A. Console16bit = object. Create (GameConsole. Prototype). Load _ function (gamename) (
- B. Console16bit. Prototype. Load (gamename) (
- C. Console116bit. Prototype. Load (gamename) = function () (
- D. Console16bit. Prototype. Load = function (gamename) (
Answer: D
NEW QUESTION 67
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. { type : 'update', recordId : '123abc' }
- B. 'Update' , {
Details : {
recordId : '123abc' - C. 'Update' , (
recordId : '123abc'
( - D. 'Update' , '123abc'
Answer: B,C
Explanation:
}
}
NEW QUESTION 68
A developer has the function, shown below, that is called when a page loads.
Where can the developer see the log statement after loading the page in the browser?
- A. Browser performance tools
- B. Browser javaScript console
- C. Terminal running the web server.
- D. On the webpage
Answer: B
NEW QUESTION 69
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 70
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