JavaScript-Developer-I | What Validated JavaScript-Developer-I Testing Bible Is

NEW QUESTION 1
Which two console logs output NaN? Choose 2 answers | |

• A. console.log(10 / Number('5) ) ;
• B. console.log(parseInt ' ("two')) ;
• C. console.log(10 / 0);
• D. console.loeg(10 / 'five');

Answer: BD

NEW QUESTION 2
In the browser, the window object is often used to assign variables that require the broadest scope in an application Node.js application does not have access to the window object by default.
Which two methods are used to address this ? Choose 2 answers

• A. Use the document object instead of the window object.
• B. Assign variables to the global object.
• C. Create a new window object in the root file.
• D. Assign variablesto module.exports and require them as needed.

Answer: B

NEW QUESTION 3
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 4
Refer to code below:
Let productSKU = ‘8675309’ ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with ‘sku’,and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

• A. productSKU = productSKU .padStart (19. ‘0’).padstart(‘sku’);
• B. productSKU = productSKU .padEnd (16. ‘0’).padstart(‘sku’);
• C. productSKU = productSKU .padEnd (16. ‘0’).padstart(19, ‘sku’);
• D. productSKU = productSKU .padStart (16. ‘0’).padstart(19, ‘sku’);

Answer: D

NEW QUESTION 5
developer creates a new web server that uses Node.js. It imports aserver library that uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a
variable named server. The developer wants to log any issues that the server has while booting up.
Given the code and the information the developer has, which code logs an error at boost with an event?

• A. Server.catch ((server) => { console.log(‘ERROR’, error);});
• B. Server.error ((server) => { console.log(‘ERROR’, error);});
• C. Server.on (‘error’, (error) => { console.log(‘ERROR’, error);});
• D. Try{server.start();} catch(error) { console.log(‘ERROR’, error);}

Answer: C

NEW QUESTION 6
A test has a dependency on database.query. During the test the dependency is replaced with an object called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement? Choose 2 answers

• A. Integration
• B. Black box
• C. White box
• D. Mocking

Answer: CD

NEW QUESTION 7
A developer is debugging a web server that uses Node.js The server hits a runtimeerror every third request to an important endpoint on the web server.
The developer added a break point to the start script, that is at index.js at he root of the server’s source code. The developer wants to make use of chrome DevTools to debug. Which command can be run to access DevTools and make sure the breakdown is hit ?

• A. node -i index.js
• B. Node --inspect-brk index.js
• C. Node inspect index.js
• D. Node --inspect index.js

Answer: D

NEW QUESTION 8
A developer is asked to fix some bugs reported by users. Todo 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 values of the carSpeed and fourWheels variables
• B. A variable displaying the number of instances created for theCar Object.
• C. The style, event listeners and other attributes applied to the carSpeed DOM element
• D. The information stored in the window.localStorage property

Answer: CD

NEW QUESTION 9
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 10
Given the following code:
document.body.addEventListener(‘ click ’, (event) => { if (/* CODE REPLACEMENT HERE */) {
console.log(‘button clicked!’);
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

• A. Event.clicked
• B. e.nodeTarget ==this
• C. event.target.nodeName == ‘BUTTON’
• D. button.addEventListener(‘click’)

Answer: C

NEW QUESTION 11
Refer to the HTML below:
<div id=”main”>
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statementresults in changing “ Tony” to “Mr. T.”?

• A. document.querySelectorAll(‘$main $TONY’).innerHTML = ’ M
• B. ’;
• C. document.querySelector(‘$main li:second-child’).innerHTML = ’ M
• D. ’;
• E. document.querySelector(‘$main li.Tony’).innerHTML = ’ M
• F. ’;
• G. document.querySelector(‘$main li:nth-child(2)’),innerHTML = ’ M
• H. ’;

Answer: D

NEW QUESTION 12
Refer to the following code that performs a basic mathematical operation on a provided input:
function calculate(num) { Return (num +10) / 3;
}
How should line 02 be written to ensure thatx evaluates to 6 in the line below? Let x = calculate (8);

• A. Return Number((num +10) /3 );
• B. Return (Number (num +10 ) / 3;
• C. Return Integer(num +10) /3;
• D. Return Number(num + 10) / 3;

Answer: B

NEW QUESTION 13
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.

Which three console logging methods allow the use of string substitution in line 02?

• A. Assert
• B. Log
• C. Message
• D. Info
• E. Error

Answer: AD

NEW QUESTION 14
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. [ ‘pizza’,’Burger’, ‘French fires’, ‘Garlic bread’]
• B. [ ‘pizza’,’Burger’, ‘French fires’]
• C. [ ‘Garlic bread’ , ‘pizza’,’Burger’, ‘French fires’ ]
• D. [ ‘Garlic bread’]

Answer: B

NEW QUESTION 15
A developer is leading the creation of a new browser application that will serve a single page application. The teamwants 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. Vue
• B. Angular
• C. Koa
• D. Express

Answer: BD

NEW QUESTION 16
Refer to the code snippet below: Let array = [1, 2, 3, 4, 4, 5, 4, 4];
For (let i =0; i < array.length; i++) if (array[i] === 4) {
array.splice(i, 1);
}
}

What is the value of array after the code executes?

• A. [1, 2, 3, 4, 5, 4, 4]
• B. [1, 2, 3, 4, 4, 5, 4]
• C. [1, 2, 3, 5]
• D. [1, 2, 3, 4, 5, 4]

Answer: B

NEW QUESTION 17
A developer wants to define a function log to be used a few times on a single-file JavaScript script.
01 // Line 1 replacement
02 console.log('"LOG:', logInput);
03 }
Which two options can correctly replace line 01 and declare the function for use? Choose 2 answers

• A. function leg(logInput) {
• B. const log(loginInput) {
• C. const log = (logInput) => {
• D. function log = (logInput) {

Answer: AC

NEW QUESTION 18
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 19
A developer creates a simple webpage with an input field. Whena 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. Replace line 04 with console.log(input .value);
• B. Replace line 03 with const input = document.getElementByName(‘input’);
• C. Replace line 02 with button.addEventListener(“onclick”, function() {
• D. Replace line 02 with button.addCallback(“click”, function() {

Answer: A

NEW QUESTION 20
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