Certification Training for JavaScript-Developer-I Exam Dumps Test Engine [2023]
Jul 27, 2023 Step by Step Guide to Prepare for JavaScript-Developer-I Exam
Earning the Salesforce JavaScript-Developer-I certification demonstrates a candidate's expertise in building custom applications and functionality on the Salesforce platform using JavaScript. It also validates the candidate's knowledge of best practices and patterns for application development on the platform. This certification can help developers stand out in the job market and advance their careers in the Salesforce ecosystem.
For more info read reference:
Salesforce JavaScript-Developer-I Certification leaning site Salesforce JavaScript-Developer-Is Certification resources
NEW QUESTION # 35
A developer at Universal Containers is creating their new landing page based on HTML, CSS, and JavaScript. The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage Is loaded and there Is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?
- A. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);
- B. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);
- C. windows,addEventListener('load', personalizeWebsiteContent);
- D. windows,addEventListener('onload', personalizeWebsiteContent);
Answer: C
NEW QUESTION # 36
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?
- A. C
- B. B
- C. D
- D. A
Answer: D
NEW QUESTION # 37
Refer to the following code:
Which two statements could be inserted at line 17 to enable the function call on line 18?
Choose 2 answers
- A. Object,assign(1eo, tony) ;
- B. Object.assign, assign( 1eo, trigger);
- C. 1eo.prototype.roar = ( ) => ( console.log (They\'re pretty good1'); );
- D. 1eo.roar = () => 9 (console.log('They\'re pretty good1'); 1;
Answer: A,D
NEW QUESTION # 38
A developer wants to create an object from a function in the browser using the code below:
Function Monster() { this.name = 'hello' };
Const z = Monster();
What happens due to lack of the new keyword on line 02?
- A. Window.m is assigned the correct object.
- B. The z variable is assigned the correct object but this.name remains undefined.
- C. The z variable is assigned the correct object.
- D. Window.name is assigned to 'hello' and the variable z remains undefined.
Answer: D
NEW QUESTION # 39
Refer to the code below:
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?
Answer:
Explanation:
event.target.id =='myElement'
NEW QUESTION # 40
Which two options are core Node.js modules?
Choose 2 answers
- A. http
- B. worker
- C. isotream
- D. exception
Answer: A,C
NEW QUESTION # 41
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. "Username available"
- B. "newUserName"
- C. undefined
- D. "Msg is not defined"
Answer: C
NEW QUESTION # 42
Refer to the code below:
Const pi w 3.1415926;
What is the data type of pi?
- A. Decimal
- B. Double
- C. Number
- D. Float
Answer: C
NEW QUESTION # 43
Given code below:
setTimeout (() => (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?
- A. 2 5 1 3 4
- B. 1 2 5 3 4
- C. 2 1 4 3 5
- D. 1 2 4 3 5
Answer: A
NEW QUESTION # 44
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 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 with button.addEventListener("onclick", function() {
Answer: A
NEW QUESTION # 45
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];
Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?
- A. Let arr2 = arr1.sort();
- B. Let arr2 = Array.from(arr1);
- C. Let arr2 = arr1.slice(0, 5);
- D. Let arr2 = arr1;
Answer: B,C
NEW QUESTION # 46
A developer needs to test this function:
01 const sum3 = (arr) => (
02 if (!arr.length) return 0,
03 if (arr.length === 1) return arr[0],
04 if (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('hello', 2, 3, 4)) === NaN);
- B. console.assert(sum3(-3, 2 )) == -1);
- C. console.assert(sum3(0)) == 0);
- D. console.assert(sum3(1, '2')) == 12);
Answer: B,D
NEW QUESTION # 47
A developer tries to retrieve all cookies, then sets a certain key value pair in the cookie. These statements are used:
What is the behavior?
- A. Cookies are read, but the key value is not set because the value is not URL encoded.
- B. A Cookies are read and the key value is set, the remaining cookies are unaffected.
- C. Cookies are read and the key value is set, and all cookies are wiped.
- D. Cookies are not read because line 01 should be document, cookies, but the key value is set and all cookies are wiped.
Answer: B
NEW QUESTION # 48
A test has a dependency on database. query. During the test, the dependency is replaced with an object called database with the method,
Calculator query, that returns an array. The developer does not need to verify how many times the method has been called.
Which two test approaches describe the requirement?
Choose 2 answers
- A. White box
- B. Substitution
- C. Stubbing
- D. Black box
Answer: A,B
NEW QUESTION # 49
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill ( items ) {
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?
- A. Using the debugger command on line 05.
- B. Calling the console.trace (total) method on line 03.
- C. Wrapping findSubtotal in a console.log() method.
- D. Using the debugger command on line 03
Answer: A
NEW QUESTION # 50
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers
- A. The developer should rework the code.
- B. The tester should dear their browser cache.
- C. The tester should disable their browser cache.
- D. The developer should inspect their browser refresh settings.
Answer: B,D
NEW QUESTION # 51
Refer to the code below:
Why does the function bar have access to variable =?
- A. Outer function's scope
- B. Prototype chain
- C. Hoisting
- D. Inner function's scope
Answer: D
NEW QUESTION # 52
......
The Salesforce Certified JavaScript Developer I exam is a computer-based test that consists of 60 multiple-choice questions that the candidates need to complete within 105 minutes. The exam is designed to assess the candidate's understanding of the key aspects of JavaScript development on the Salesforce platform, including the architecture of Salesforce Lightning, the Apex programming language, and the use of Visualforce and other web technologies.
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