[Dec 23, 2025] JavaScript-Developer-I Dumps PDF and Test Engine Exam Questions - Actualtests4sure
Verified JavaScript-Developer-I exam dumps Q&As with Correct 224 Questions and Answers
Achieving the Salesforce Certified JavaScript Developer I certification is a great way to demonstrate your expertise in JavaScript and your ability to build custom applications that can be integrated with Salesforce. Salesforce Certified JavaScript Developer I Exam certification can help you stand out from other developers and can open up new career opportunities in the Salesforce ecosystem.
Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional
Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:
- England - 60,200 POUND
- United State - 129,630 USD
- Europe - 63,500 Euro
Salesforce JavaScript-Developer-I (Salesforce Certified JavaScript Developer I) Exam is a certification exam that tests the candidate's knowledge and skills in JavaScript development on the Salesforce platform. JavaScript-Developer-I exam is designed for individuals who have experience in developing custom applications using JavaScript and are looking to enhance their skills and knowledge in Salesforce development. JavaScript-Developer-I exam covers various topics such as Apex, Visualforce, and Lightning Web Components.
NEW QUESTION # 65
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1, 2]?
Choose 3 answer
- A. let x =arr.splice(0, 2);
- B. let x = arr. slice (2);
- C. let x = arr. slice (0, 2);
- D. let x arr.filter((a) => (return a <= 2 });
- E. let x = arr.filter ((a) => 2 }) ;
Answer: A,C,D
NEW QUESTION # 66
A developer is creating a simple webpage with a button. When a user clicks this button for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers
- A. On line 04, use button.removeEventListener(' click" , listen);
- B. On line 04, use event.stopPropagation ( ),
- C. On line 06, add an option called once to button.addEventListener().
- D. On line 02, use event.first to test if it is the first execution.
Answer: A,C
NEW QUESTION # 67
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 File();
08 if (file) reader.readAsDataURL(file); - B. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file); - C. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file); - D. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
Answer: C
NEW QUESTION # 68
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. Undefined
- B. 0
- C. 1
- D. Nan
Answer: C
NEW QUESTION # 69
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers
- A. The function uses the this from the enclosing scope.
- B. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
- C. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.
- D. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
Answer: C,D
NEW QUESTION # 70
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 values of the carSpeed and fourWheels variables
- B. A variable displaying the number of instances created for the Car 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: C,D
NEW QUESTION # 71
Refer to the code below:
When does promise. Finally on line 08 get called?
- A. When rejected
- B. When resolved
- C. When resolved or rejected
- D. When resolved and settled
Answer: C
NEW QUESTION # 72
Refer to the code below:
What is the result of running line 05?
- A. Apromise and bpromise run in parallel.
- B. Neither aPromise or bPromise runs.
- C. aPromise and bPromise run sequentially.
- D. Only apromise runs.
Answer: B
NEW QUESTION # 73
Given the code below:
What is logged to the console'
- A. 2 5 1 3 4
- B. 1 2 3 4 5
- C. 1 2 5 3 4
- D. 2 5 3 4 1
Answer: D
NEW QUESTION # 74
Refer to the code below:
Line 05 causes an error.
What are the values of greeting and salutation once code completes?
- A. Greeting is Hello and salutation is I say hello.
- B. Greeting is Hello and salutation is Hello, Hello.
- C. Greeting is Goodbye and salutation is I say Hello.
- D. Greeting is Goodbye and salutation is Hello, Hello.
Answer: B
NEW QUESTION # 75
Which two console logs out NaN?
Choose 2 answers
- A. Console.log(10 / Number ('5) );
- B. Console.log(parseint ('two') ) ;
- C. Console.log (10 / 0);
- D. Console.log(10 / 'five' ') ;
Answer: B,D
NEW QUESTION # 76
Universal Containers (UC) just launched a new landing page, but users complain that the website is slow. A developer found some functions any that might cause this problem. To verify this, the developer decides to execute everything and log the time each of these three suspicious functions consumes.
Which function can the developer use to obtain the time spent by every one of the three functions?
- A. console.timeStamp ()
- B. console.getTime ()
- C. console.trace()
- D. console. timeLog ()
Answer: D
NEW QUESTION # 77
Given the following code:
What is the output of line 02?
- A. "null"
- B. "x-
- C. "undefined" 0
- D. 'object"
Answer: D
NEW QUESTION # 78
Given the JavaScript below:
01 function filterDOM (searchString) {
02 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(' .account' ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?
- A. ' hidden ' : ' visible '
- B. ' Block ' : ' none '
- C. ' visible ' : ' hidden '
- D. ' name ' : ' block '
Answer: B
NEW QUESTION # 79
Refer to the HTML below:
Which JavaScript statement results in changing ''Tony'' to ''Mr. T. ''?
- A. Document.querySelectorAll ( '#main li, Tony ' ) innerHTNL = Mr, T , ' ;
- B. Document.querySelector (''#main li:nth-child (2) ') , innerHTML = 'Mr . T ';
- C. Document.querySelectorAll ('#main # TONY ') , innerHTML = Mr, T , ' ;
- D. Document.querySelector (' '#main li:second-child') innerHTML, = Mr, T, ';
Answer: C
NEW QUESTION # 80
Which javascript methods can be used to serialize an object into a string and deserialize
a JSON string into an object, respectively?
- A. JSON.parse and JSON.deserialize
- B. JSON.stringify and JSON.parse
- C. JSON.encode and JSON.decode
- D. JSON.serialize and JSON.deserialize
Answer: B
NEW QUESTION # 81
developer creates a new web server that uses Node.js. It imports a server 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) {
Answer: C
Explanation:
console.log('ERROR', error);
}
NEW QUESTION # 82
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. In the browser performance tools log
- B. On the terminal console running the web server
- C. On the webpage console log
- D. On the browser JavaScriptconsole
Answer: D
NEW QUESTION # 83
Refer to the following code block:
What is the console output?
- A. > Better student Jackie got 100% on test.
- B. > Jackie got 70% on test.
- C. > Uncaught Reference Error
- D. > Better student Jackie got 70% on test.
Answer: A
NEW QUESTION # 84
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