Up To The Minute Salesforce Certified JavaScript Developer I JavaScript-Developer-I Braindumps

NEW QUESTION 1
Which three statements are true about promises ? Choose 3 answers

• A. The executor of a new Promise runs automatically.
• B. A Promise has a .then() method.
• C. A fulfilled or rejected promise will not change states .
• D. A settled promise can become resolved.
• E. A pending promise canbecome fulfilled, settled, or rejected.

Answer: BCE

NEW QUESTION 2
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 throws an error.
• B. The url variable has global scope and line 02 executes correctly.
• C. The url variable has global scope and line 02 throws an error.
• D. The url variable has local scope and line 02 executes correctly.

Answer: B

NEW QUESTION 3
A team that works on a big project uses npm to deal with projects dependencies. A developer added a dependency does not get downloaded when they executenpm install.
Which two reasons could be possible explanations for this?
Choose 2 answers

• A. The developer missed the option --add when adding the dependency.
• B. The developer added the dependency as a dev dependency, and NODE_ENVIs set to production.
• C. The developer missed the option --save when adding the dependency.
• D. The developer added the dependency as a dev dependency, and NODE_ENV is set to production.

Answer: BCD

NEW QUESTION 4
A Developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three number in the array, The test passes:

A different developer made changes to the behavior of sum3 to instead sum all of the numbers present in the array. The test passes:
Which two results occur when running the test on the updated sum3 function ? Choose 2 answers

• A. The line 02 assertion passes.
• B. The line 02 assertion fails
• C. The line 05 assertion passes.
• D. The line 05 assertion fails.

Answer: AD

NEW QUESTION 5
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 0 1 2
• B. 0 1 2 3
• C. 0 1 1 2
• D. 0 1 2 2

Answer: C

NEW QUESTION 6
A class was written to represent items for purchase in an online store, and a second class Representing items that are on sale at a discounted price. THe constructor sets the name to the first value passed in. The pseudocode is below:

There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.

What is the output when executing the code above ?

• A. This is a ScarfUncaught TypeError:saleItem.description is not a function This is aScarfThis is a discounted Shirt
• B. This is a Scarf This is a Shirt This is a ScarfThis is a discounted Shirt
• C. This is a Scarf This is a ShirtThis is a discounted Scarf This is a discounted Shirt
• D. Thisis aScarfUncaught TypeError: saleItem.description is not a function This is a ShirtThis is a did counted Shirt

Answer: B

NEW QUESTION 7
Refer to the following object:

How can a developer access the fullName property for cat?

• A. cat.fullName
• B. cat.fullName()
• C. cat.get.fullName
• D. cat.function.fullName()

Answer: A

NEW QUESTION 8
A developer writers the code below to calculate the factorial of a given number.

What isthe result of executing line 04?

• A. 6
• B. -Infinity
• C. RuntimeError

Answer: D

Explanation:

NEW QUESTION 9
A developer wrote the following codeto test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in thearray.

Which two results occur when running this test on the updated sum3 function? Choose 2 answers

• A. The line 05 assertion passes.
• B. The line 02 assertion passes.
• C. The line 02 assertion fails.
• D. The line 05 assertion fails.

Answer: BD

NEW QUESTION 10
Which codestatement below correctly persists an objects in local Storage ?

• A. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.setItem(storageKey, JSON.stringify(jsObject));}
• B. const setLocalStorage = ( jsObject) => { window.localStorage.connectObject(jsObject));}
• C. const setLocalStorage = ( jsObject) => { window.localStorage.setItem(jsObject);}
• D. const setLocalStorage = (storageKey, jsObject) => { window.localStorage.persist(storageKey, jsObject);}

Answer: A

NEW QUESTION 11
Which statement accurately describes an aspect of promises?

• A. Arguments for the callback function passed to .then() are optional.
• B. In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
• C. .then() cannot be added after a catch.
• D. .then() manipulates and returns the original promise.

Answer: A

NEW QUESTION 12
A developer wants to setup 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 server =require(‘secure-server’);
• C. const tls = require(‘tls’);
• D. const http =require(‘http’);

Answer: A

NEW QUESTION 13
developer is trying to convince management that their team will benefit from using
Node.js for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager? Choose 3 answers:

• A. I nstalls with its own package manager toinstall and manage third-party libraries.
• B. Ensures stability with one major release every few years.
• C. Performs a static analysis on code before execution to look for runtime errors.
• D. Executes server-side JavaScript code to avoid learning a new language.
• E. User non blocking functionality for performant request handling .

Answer: ACE

NEW QUESTION 14
A developer needs to test this function:
01const sum3 = (arr) => (
02if (!arr.length) return 0,
03if (arr.length === 1) return arr[0],
04if (arr.length === 2) return arr[0]+ arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function? Choose 2 answers

• A. console.assert(sum3(1, ‘2’)) == 12);
• B. console.assert(sum3(0)) == 0);
• C. console.assert(sum3(-3, 2 )) == -1);
• D. console.assert(sum3(‘hello’, 2, 3, 4)) === NaN);

Answer: AC

NEW QUESTION 15
A developer has a web server running with Node.js. The command to start the web server is node server.js.
The web server started having
latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

• A. NODE_DEBUG=true node server.js
• B. DEBUG=http, https node server.js
• C. NODE_DEBUG=http,https node server.js
• D. DEBUG=true node server.js

Answer: D

NEW QUESTION 16
Refer to HTML below:
<p> The current status of an Order: <span id =”status”> In Progress </span> </p>.
Which JavaScript statement changes the text ‘In Progress’ to ‘Completed’ ?

• A. document.getElementById(“status”).Value = ’Completed’ ;
• B. document.getElementById(“#status”).innerHTML = ’Completed’ ;
• C. document.getElementById(“status”).innerHTML = ’Completed’ ;
• D. document.getElementById(“.status”).innerHTML = ’Completed’ ;

Answer: C

NEW QUESTION 17
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:

The developer wrote the javascript code below:

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 04 with console.log(input .value);
• B. Replace line 03 with const input = document.getElementByName(‘input’);
• C. Replace line 02 with button.addCallback(“click”, function() {
• D. Replace line 02 withbutton.addEventListener(“onclick”, function() {

Answer: A

NEW QUESTION 18
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