Free PDF 2026 High Pass-Rate JS-Dev-101: Salesforce Certified JavaScript Developer - Multiple Choice Reliable Test Objectives

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Browser and Events	17%	- Event handling, propagation, bubbling, and capturing - Browser Developer Tools - DOM manipulation
Topic 2: Asynchronous Programming	13%	- Promises and async/await - Callback patterns - Event loop and asynchronous code execution
Topic 3: Variables, Types, and Collections	23%	- Array manipulation (map, filter, reduce, forEach, find) - JSON parsing and stringification - Variable declaration (var, let, const, scoping, hoisting) - String manipulation and Date objects - Type coercion and type conversion
Topic 4: Testing	7%	- Automated testing strategies - Test-driven development principles - Unit testing with Jest
Topic 5: Debugging and Error Handling	7%	- try-catch blocks - Logging strategies and debugging techniques
Topic 6: Objects, Functions, and Classes	25%	- JavaScript modules (export, import) - ES6 Classes, constructors, methods, and inheritance - Function declarations, expressions, and arrow functions - Object creation, properties, and prototypal inheritance - Higher-order functions and closures
Topic 7: Server Side JavaScript	8%	- Modules and file operations - Node.js applications - Salesforce API integration

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q120-Q125):

NEW QUESTION # 120
A developer has two ways to write a function:
Option A:
function Monster() {
This.growl = () => {
Console.log ("Grr!");
}
}
Option B:
function Monster() {};
Monster.prototype.growl =() => {
console.log("Grr!");
}
After deciding on an option, the developer creates 1000 monster objects.
How many growl methods are created with Option A Option B?

A. 1 growl method is created regardless of whichoption is used.
B. 1 growl method is created for Option 1000 growl methods are created for Option B.
C. 1000 growl methods are created regardless of which option is used.
D. 1000 growl method is created for Option A. 1 growl methods are created for Option

Answer: D

NEW QUESTION # 121
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. window.addEventListener('onload', personalizeWebsiteContent);
D. document.addEventListener('DOMContentLoaded', 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 # 122
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string indexvalues, the value of str is 'javascript'. What is the reason for this value:

A. Non-primitive values are mutable.
B. Non-primitive values are immutable.
C. Primitive values are mutable.
D. Primitive values are immutable.

Answer: D

NEW QUESTION # 123
Refer to the code below:
let timeFunction =() => {
console.log('Timer called.");
};
let timerId = setTimeout (timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?

A. removeTimeout(timedFunction);
B. clearTimeout(timerId);
C. removeTimeout(timerId);
D. clearTimeout(timedFunction);

Answer: B

NEW QUESTION # 124
Given the code below:
01 setCurrentUrl();
02 console.log("The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

A. The url variable has local scope and line 02 throws an error.
B. The url variable has global scope and line 02 throws an error.
C. The url variable has global scope and line 02 executes correctly.
D. The url variable has local scope and line 02 executes correctly.

Answer: C

Explanation:
Inside setCurrentUrl, url is assigned without var, let, or const:
url = window.location.href;
In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
setCurrentUrl(); creates/sets global url to window.location.href.
console.log("The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
url has global scope.
Line 02 runs without error and logs a valid string.
So B is correct.
________________________________________

NEW QUESTION # 125
......

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