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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Objectives
Salesforce Platform Integration	- Lightning Web Components (LWC) Basics - Working with Salesforce Data Models
Asynchronous Programming	- API Calls and Data Fetching - Callbacks, Promises, and Async/Await
Object-Oriented JavaScript	- Classes and Inheritance - Objects and Prototypes
JavaScript Fundamentals	- Control Flow and Error Handling - Functions and Scope - Variables, Data Types, and Operators
Browser and DOM Interaction	- DOM Manipulation - Events and Event Handling

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q84-Q89):

NEW QUESTION # 84
A page loads 50+ <div class="ad-library-item"> elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:

A. Use the browser console to execute a script that removes all elements containing the class ad-library-item.
B. Use the DOM inspector to remove all elements containing the class ad-library-item.
C. Use the DOM inspector to prevent the load event from firing.
D. Use the browser console to execute a script that prevents the load event from firing.

Answer: A

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The goal:
"Temporarily and quickly remove them."
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll('.ad-library-item').forEach(el => el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
A & B: Preventing load events is unreliable and does not remove already-created DOM nodes.
C: Correct-console code can remove all matching DOM elements instantly.
D: Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
________________________________________
JavaScript Knowledge Reference (text-only)
The browser console can run arbitrary JavaScript that manipulates the DOM.
document.querySelectorAll() returns all matching DOM nodes.
Nodes can be removed using .remove().

NEW QUESTION # 85
Given the code below:
FunctionmyFunction(){
A =5;
Var b =1;
}
myFunction();
console.log(a);
console.log(b);
What is the expected output?

A. Line 08 outputs the variable, but line 09 throws an error.
B. Line 08thrones an error, therefore line 09 is never executed.
C. Both lines 08 and 09 are executed, and the variables are outputted.
D. Both lines 08 and 09 are executed, but values outputted are undefined.

Answer: A

NEW QUESTION # 86
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript TO ensure that visitors have a goodexperience, a script named personaliseContext needs to be executed when the webpage is fully loaded (HTML content and all related files ), in order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based onthe above business requirement?

A. window.addEventListener('load',personalizeWebsiteContext);
B. Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);
C. document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);
D. window.addEventListener('onload', personalizeWebsiteContext);

Answer: A

NEW QUESTION # 87
Which statement accurately describes the behavior of the async/await keywords?

A. The associated function is asynchronous, but acts like synchronous code.
B. The associated function can only be called via asynchronous methods.
C. The associated function sometimes returns a promise.
D. The associated class contains some asynchronous functions.

Answer: A

Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
The function always returns a Promise, regardless of what is returned inside.
Inside the function, await pauses execution until a Promise resolves.
Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
A incorrect:
Not "sometimes"-an async function always returns a Promise.
B incorrect:
Async functions can be called just like normal functions.
C incorrect:
Async/await has nothing to do with classes specifically.
D correct:
This is the standard description:
"Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge Reference (text-only) async functions always return Promises.
await pauses execution of the async function.
Async/await syntax creates synchronous-looking code on top of asynchronous operations.

NEW QUESTION # 88
Given two expressions, exp1 and exp2, which two valid ways return the logical AND of the two expressions and ensure it is a Boolean?

A. Boolean(exp1 && exp2)
B. exp1 & exp2
C. Boolean(var1) && Boolean(var2)
D. Boolean(exp1) && Boolean(exp2)

Answer: A,D

Explanation:
The correct answers are A and B.
The original question contains a typing error where 66 should be corrected to the logical AND operator:
&&
A is correct because it first evaluates the logical AND expression and then converts the final result to a Boolean:
Boolean(exp1 && exp2)
The && operator returns the first falsy value or the last truthy value. Wrapping the result in Boolean() ensures the final result is strictly either:
true
or:
false
Example:
Boolean("hello" && 123);
This returns:
true
B is also correct because it converts both expressions to Boolean values first, then applies logical AND:
Boolean(exp1) && Boolean(exp2)
This guarantees that both sides of the && operation are Boolean values.
Example:
Boolean("hello") && Boolean(123);
This returns:
true
C is incorrect because it uses the bitwise AND operator:
&
This is not the same as logical AND:
&&
Bitwise AND converts values into numbers and compares their binary representation. It does not reliably return a Boolean logical result.
D is incorrect as written because the question gives the expressions as exp1 and exp2, but option D uses var1 and var2. After correction, it would be the same idea as option B.
Therefore, the verified answers are A and B.

NEW QUESTION # 89
......

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