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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 2	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 3	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 4	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 5	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 6	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q135-Q140):

NEW QUESTION # 135
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 teamhas already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Performs a static analysis on code before execution to look for runtime errors.
B. Uses non-blocking functionality for performant requesthandling .
C. Installs with its own package manager to install and manage third-party libraries.
D. Ensures stabilitywith one major release every few years.
E. Executes server-side JavaScript code to avoid learning a new language.

Answer: A,B,C

NEW QUESTION # 136
A developer creates a simple webpage with an input field. When a user enters text in the inputfield 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 codebelow:
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 03 with const input = document.getElementByName('input');
B. Replace line 02 with button.addCallback("click", function() {
C. Replace line 04 with console.log(input .value);
D. Replace line 02 with button.addEventListener("onclick", function() {

Answer: C

NEW QUESTION # 137
A developer wrote the following code:
01 let x = object.value;
02
03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
The developer has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs. How can the developer change the code to ensure this behavior?

A. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } then {
08 getNextValue();
09 }
B. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 } finally {
08 getNextValue();
09 }
C. 03 try {
04 handleObjectValue(x);
05 getNextValue();
06 } catch(error) {
07 handleError(error);
08 }
D. 03 try {
04 handleObjectValue(x);
05 } catch(error) {
06 handleError(error);
07 }
08 getNextValue();

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
Requirement:
getNextValue() should run only if handleObjectValue(x) does not throw an error.
If an error occurs, handleError(error) should run, and getNextValue() should be skipped.
Option B:
try {
handleObjectValue(x);
getNextValue();
} catch (error) {
handleError(error);
}
Behavior:
If handleObjectValue(x) succeeds (no error):
Execution continues to getNextValue();.
If handleObjectValue(x) throws:
Control jumps directly to catch, getNextValue() is skipped.
handleError(error); is called.
This matches the requirement perfectly.
Why others are incorrect:
A: } then { is invalid JavaScript syntax.
C:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
}
getNextValue();
getNextValue() is called after the try...catch regardless of whether an error occurred. Not acceptable.
D: finally always runs:
try {
handleObjectValue(x);
} catch (error) {
handleError(error);
} finally {
getNextValue();
}
getNextValue() will execute in both success and error cases.
Therefore, the correct approach is B.
Concepts: try/catch control flow, finally semantics, placing code inside vs outside try/catch blocks.
________________________________________

NEW QUESTION # 138
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. document.addEventListener('onDOMContentLoaded', personalizeWebsiteContent);
B. window.addEventListener('load', personalizeWebsiteContent);
C. document.addEventListener('DOMContentLoaded', personalizeWebsiteContent);
D. window.addEventListener('onload', personalizeWebsiteContent);

Answer: B

Explanation:
Two key browser events:
DOMContentLoaded (fired on document):
Fired when the HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subresources to finish loading.
load (fired on window):
Fired when the entire page is fully loaded, including all dependent resources such as stylesheets and images.
The requirement states:
"... when the webpage is fully loaded with HTML content and all related files." That matches the semantics of the load event on the window object.
So the correct code is:
window.addEventListener('load', personalizeWebsiteContent);
Why others are incorrect:
A: DOMContentLoaded fires earlier, when HTML is parsed, but before all related files (images, some styles, etc.) are guaranteed to be loaded.
B: 'onDOMContentLoaded' is not a valid event name; the event is 'DOMContentLoaded'.
D: When using addEventListener, the event type is 'load', not 'onload'. 'onload' is the name of the handler property (window.onload = ...), not the event string.
Relevant concepts: window.load event, DOMContentLoaded, addEventListener syntax, page load lifecycle.

NEW QUESTION # 139
Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A. document. querySelectorAll('#row-uc') -classList.add("priority-accour');
B. document. querySelector (#row-uc').classes-push('priority-account');
C. document. getElementByid('row-uc').addClass('priority-account*);
D. document. queryselector('#row-uc').ClassList.add('priority-account');

Answer: D

NEW QUESTION # 140
......

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