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Salesforce JavaScript-Developer-I Certification Exam is designed to test an individual's knowledge of JavaScript and its implementation within the Salesforce platform. Salesforce Certified JavaScript Developer (JS-Dev-101) certification is ideal for developers who have experience with JavaScript and want to specialize in building custom applications on the Salesforce platform. JavaScript-Developer-I exam consists of 60 multiple-choice questions and must be completed within 105 minutes.
Salesforce JavaScript-Developer-I Certification Exam covers a variety of topics related to the development of custom applications on the Salesforce platform using JavaScript. These topics include but are not limited to data modeling, server-side development, client-side development, security, testing, and deployment. JavaScript-Developer-I exam also covers the use of Lightning Web Components, Aura Components, and other Salesforce development tools and technologies.
NEW QUESTION # 19
developer publishes a new version of a package with new features that do not break
backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number
be?
- A. 1.2.0
- B. 2.0.0
- C. 1.2.3
- D. 1.1.4
Answer: A
NEW QUESTION # 20
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 06, add an option called once to button.addEventListener().
- B. On line 04, use button.removeEventListener(' click" , listen);
- C. On line 02, use event.first to test if it is the first execution.
- D. On line 04, use event.stopPropagation ( ),
Answer: A,B
NEW QUESTION # 21
A developer creates a generic function to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
- A. Info
- B. Error
- C. Assert
- D. Message
- E. Log
Answer: A,B,E
NEW QUESTION # 22
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. Black box
- B. Mocking
- C. White box
- D. Integration
Answer: B,C
NEW QUESTION # 23
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.target.nodeName == 'BUTTON'
- B. button.addEventListener('click')
- C. e.nodeTarget ==this
- D. Event.clicked
Answer: A
NEW QUESTION # 24
Given:
const str = ' Salesforce ' ;
Which two statements result in ' Sales ' ?
- A. str.substr(0, 5);
- B. str.substring(1, 5);
- C. str.substr(1, 5);
- D. str.substring(0, 5);
Answer: A,D
Explanation:
str = ' Salesforce '
Index positions:
S(0) a(1) l(2) e(3) s(4) f(5) o(6) r(7) c(8) e(9)
* substring(start, end)
* Start index inclusive, end index exclusive.
* str.substring(0, 5) # characters at indices 0-4 # " Sales "
* str.substring(1, 5) # indices 1-4 # " ales "
* substr(start, length)
* Start index, then number of characters.
* str.substr(0, 5) # 5 characters starting at index 0 # " Sales "
* str.substr(1, 5) # 5 characters from index 1 # " alesf "
So the expressions that return " Sales " are A and C.
NEW QUESTION # 25
A developer is wondering whether to use, Promise.then or Promise.catch, especially when a Promise throws an error?
Which two promises are rejected?
Which 2 are correct?
- A. Promise.reject('cool error here').then(error => console.error(error));
- B. New Promise(() => (throw 'cool error here'}).then(null, error => console.error(error)));
- C. Promise.reject('cool error here').catch(error => console.error(error));
- D. New Promise((resolve, reject) => (throw 'cool error here'}).catch(error => console.error(error)) ;
Answer: C,D
NEW QUESTION # 26
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 andthe key value is set, the remaining cookies are unaffected.
- C. Cookies are not read because line 01 should be document, cookies, but the key value is set and all cookies are wiped.
- D. Cookies are read and the key value is set, and all cookies are wiped.
Answer: B
NEW QUESTION # 27
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. Using the debugger command on line 03
- C. Wrapping findSubtotal in a console.log() method.
- D. Calling the console.trace (total) method on line 03.
Answer: A
NEW QUESTION # 28
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. There is a new requirement for a developer to implement a description method that will return a brief description for Item and SaleItem.
01 let regItem = new Item( ' Scarf ' , 55);
02 let saleItem = new SaleItem( ' Shirt ' , 80, .1);
03 Item.prototype.description = function() { return ' This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return ' This is a discounted ' + this.name; } What is the output when executing the code above?
- A. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Scarf
This is a discounted Shirt - B. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a discounted Shirt - C. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt - D. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt
Answer: C
Explanation:
Comprehensive and Detailed Explanation:
Assuming SaleItem inherits from Item via prototype (e.g. SaleItem.prototype = Object.create(Item.prototype)):
* Lines 01-02: create regItem and saleItem.
* Line 03: define Item.prototype.description.
Now both regItem and saleItem (via inheritance) have a description method from Item.prototype.
* Line 04: regItem.description() # ' This is a Scarf ' .
* Line 05: saleItem.description() # ' This is a Shirt ' (same method, but this.name is ' Shirt ' ).
* Line 07: SaleItem.prototype.description = ... overrides description only for SaleItem instances going forward.
If we imagine calling regItem.description() and saleItem.description() again after line 07:
* regItem.description() still uses Item.prototype.description # ' This is a Scarf ' .
* saleItem.description() now uses SaleItem.prototype.description # ' This is a discounted Shirt ' .
Those four lines correspond to option B.
NEW QUESTION # 29
A developer has an is Dog function that takes one argument cat. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?
- A. setInterval(isDog, 60000,'cat');
Answer: A
NEW QUESTION # 30
A 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?
- A. Uses non-blocking functionality for performant request handling.
- B. Performs a static analysis on code before execution to look for runtime errors.
- C. Ensures stability with one major release every few years.
- D. Executes server-side JavaScript code to avoid learning a new language.
- E. Installs with its own package manager to install and manage third-party libraries.
Answer: A,D,E
Explanation:
The correct answers are A, C, and E .
Node.js allows JavaScript to run outside the browser. That makes it useful for backend development, command-line tools, APIs, real-time applications, and server-side services.
A is correct because Node.js executes JavaScript on the server side.
A team that already knows:
HTML
CSS
JavaScript
can use JavaScript for backend development as well. This reduces the need to switch to a completely different backend language.
Example:
const http = require( ' http ' );
const server = http.createServer((req, res) = > {
res.end( ' Hello from Node.js ' );
});
server.listen(3000);
This is server-side JavaScript.
C is correct because Node.js uses a non-blocking, event-driven model.
For API servers, this is valuable because Node.js can handle many I/O operations without blocking the entire process while waiting for tasks like:
database queries
file reads
network requests
API responses
Instead of waiting synchronously, Node.js can register callbacks, promises, or async functions and continue handling other work.
E is correct because Node.js commonly installs with npm, the Node Package Manager.
npm is used to install and manage third-party libraries, such as:
Express
Socket.IO
dotenv
Jest
Axios
This makes it easier to build backend applications using reusable packages.
Now review the incorrect answers:
B is incorrect because JavaScript is not primarily a static-analysis language by default. Node.js executes JavaScript at runtime. Static checking can be added with tools such as TypeScript, ESLint, or other analyzers, but that is not an inherent Node.js benefit.
D is incorrect because Node.js does not release one major version only every few years. Its release cycle is more frequent than that, so this is not an accurate benefit statement.
Therefore, the verified answers are A, C, and E .
NEW QUESTION # 31
Given the code below:
What happens when the code executes?
- A. The ur1 variable has global scope and line 02 executes correctly.
- B. The ur1 variables has local scope and line 02 throws an error.
- C. The ur1 variable has global scope and line 02 throws an error.
- D. The ur1 variable has local scope and line 02 executes correctly.
Answer: A
NEW QUESTION # 32
A developer has a server running with Node.js. the command to start the web server is node server.js. the 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. DEBUO=true node server,js
- B. NODE_DEBUO=http, https node server,js
- C. DEBUO=http, https node server,js
- D. NODE_DEBUO=true node server,js
Answer: C
NEW QUESTION # 33
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 that x evaluates to 6 in the line below?
Let x = calculate (8);
- A. Return (Number (num +10 ) / 3;
- B. Return Integer(num +10) /3;
- C. Return Number(num + 10) / 3;
- D. Return Number((num +10) /3 );
Answer: A
NEW QUESTION # 34
Which two code snippets show working examples of a recursive function?
Choose 2 answers
A)
B)
C)
D)
- A. Option B
- B. Option A
- C. Option C
- D. Option D
Answer: C,D
NEW QUESTION # 35
A developer is debugging a web server that uses Node.js. The server hits a runtime error 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 the 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 breakpoint is hit?
- A. Node -I index , js
- B. Node -- inspect index ,js
- C. Node --inspect -brk index , js
- D. Node inspect index , js
Answer: B
NEW QUESTION # 36
Refer to the code:
Given the code above, which three properties are set pet1?
Choose 3 answers:
- A. Owner
- B. Type
- C. Name
- D. canTalk
- E. Size
Answer: B,D,E
NEW QUESTION # 37
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 style, event listeners and other attributes applied to the carSpeed DOM element
- B. The information stored in the window.localStorage property
- C. The values of the carSpeed and fourWheels variables
- D. A variable displaying the number of instances created for the Car Object.
Answer: A,B
NEW QUESTION # 38
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Salesforce JavaScript-Developer-I exam focuses on testing a developer's knowledge of JavaScript and how it can be used to build custom applications on the Salesforce platform. This includes topics such as data modeling, user interface development, and integration with other systems. JavaScript-Developer-I exam is designed to be challenging, but it is also highly respected in the industry and can help developers stand out from the competition.
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