2024 Latest JavaScript-Developer-I dumps - Instant Download PDF
Updated Verified JavaScript-Developer-I Downloadable Printable Exam Dumps
Once certified, developers can showcase their skills and expertise in JavaScript development on the Salesforce platform. Salesforce Certified JavaScript Developer I Exam certification can help developers stand out in the job market and increase their earning potential. It can also help them gain access to new job opportunities and career advancement opportunities within their organization.
Salesforce JavaScript-Developer-I certification exam consists of 60 multiple-choice questions that must be completed within 105 minutes. JavaScript-Developer-I exam focuses on a range of topics, including JavaScript fundamentals, Apex, Visualforce, and Lightning components. A passing score of 68% is required to earn the certification.
NEW QUESTION # 11
Refer to the code below:
For (let number =2: number <= S; number += 1) ( // insert code statement here The developer needs to insert a code statement in the location shown. The code statement has these requirements:
1. Does not require an import
2. Logs an error when the Boolean statement evaluates to false
3. Works In both the browser and Node.js
Which statement meet these requirements?
- A. Assert (number $ 2 == 0);
- B. Console. Assert ( number $ 2 == 0 ) ;
- C. Console. error (number $ 2 == 0) ;
- D. Console. Debug (number $ 2 == 0) ;
Answer: B
NEW QUESTION # 12
developer uses the code below to format a date.
After executing, what is the value of formattedDate?
- A. May 10, 2020
- B. October 05, 2020
- C. June 10, 2020
- D. November 05, 2020
Answer: C
NEW QUESTION # 13
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. White box
- B. Black box
- C. Mocking
- D. Integration
Answer: A,C
NEW QUESTION # 14
Refer to the following array:
Let arr1 = [1, 2, 3, 4, 5];
Which two lines of codes result in a second array, arr2, being created such that arr2 is not a reference to arr1? Choose 2 answers
- A. Let arr2 = arr1 .slice (0, 5);
- B. Let arr2 = arr1;
- C. Let arr2 = arr1 sort ();
- D. Let arr2 = Array. From (arr1) ;
Answer: B,C
NEW QUESTION # 15
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 06, add an option called once to button.addEventListener().
- C. On line 04, use event.stopPropagation ( ),
- D. On line 02, use event.first to test if it is the first execution.
Answer: A,B
NEW QUESTION # 16
Refer to the following code:
- A. Button message
- B. Outer message
- C. Inner message
Outer message - D. Outer message
Inner message
Answer: A
NEW QUESTION # 17
Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?
- A. Number
- B. Decimal
- C. Float
- D. Double
Answer: A
NEW QUESTION # 18
Refer to the code below:
Const myFunction = arr => {
Return arr.reduce((result, current) =>{
Return result = current;
}, 10};
}
What is the output of this function when called with an empty array ?
- A. Returns NaN
- B. Throws an error
- C. Returns 0
- D. Returns 10
Answer: D
NEW QUESTION # 19
developer wants to use a module named universalContainersLib and them call functions from it.
How should a developer import every function from the module and then call the functions foo and bar ?
- A. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar(); - B. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar(); - C. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar(); - D. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
Answer: A
NEW QUESTION # 20
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers
- A. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
- 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. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
Answer: C,D
NEW QUESTION # 21
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 # 22
A developer implements and calls the following code when an application state change occurs:
If the back button is clicked after this method is executed, what can a developer expect?
- A. A navigate event is fired with a state properly that details previous application state.
- B. The page is navigated away from and previous page in the browser's history is loaded.
- C. The page reloads and all JavaScript is reinitialized.
- D. A popstate event is fired with a state properly that details the application's last state.
Answer: B
NEW QUESTION # 23
Why would a developer specify a package as the package.json as a deDepdelivery instead of a depdelivery?
- A. Other required packages depended on it for development.
- B. It is only needed for local development and testing.
- C. It should be bundled when the package is published.
- D. It is required by the application in production.
Answer: B
NEW QUESTION # 24
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 # 25
Which two code snippets show working examples of a recursive function?
Choose 2 answers
- A. Let countingDown = function(startNumber) {
If ( startNumber >0) {
console.log(startNumber) ;
return countingDown(startNUmber);
} else {
return startNumber;
}}; - B. Const sumToTen = numVar => {
If (numVar < 0)
Return;
return sumToTen(numVar + 1)}; - C. Const factorial =numVar => {
If (numVar < 0) return;
If ( numVar === 0 ) return 1;
return numVar * factorial ( numVar - 1 );
}; - D. Function factorial ( numVar ) {
If (numVar < 0) return;
If ( numVar === 0 ) return 1;
return numVar -1;
Answer: A,C
NEW QUESTION # 26
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as (3, 4, 5)?
Choose 3 answers
- A. Let x = arr.filter( (a) => )return a > 2 )) ;
- B. Let x = arr.alice (2) ;
- C. Let x = arr.filter( (a) => ( a < 2)) ;
- D. Let x = arr. Slince (2, 3);
- E. Let x = arr.aplice (2, 3);
Answer: A,B,E
NEW QUESTION # 27
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 # 28
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