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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	Variables, Types, and Collections: Covers declaring and initializing variables, working with strings, numbers, dates, arrays, and JSON, along with understanding type coercion and truthy falsy evaluations.
Topic 3	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 4	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 5	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 (Q24-Q29):

NEW QUESTION # 24
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?

A. Add a handler to the personalizeWebsiteContent script to handle the load event
B. Add a handler to the personalizeWebsiteContent script to handle the DOMContentLoaded event
C. Add a listener to the window object to handle the load event
D. Add a listener to the window object to handle the DOMContentLoaded event

Answer: C

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge JavaScript defines two main page-loading events:
DOMContentLoaded
Fires when the HTML document has been completely parsed.
External resources like images, stylesheets, iframe contents, etc. may not be loaded yet.
load event on window
Fires when:
HTML is fully parsed
All dependent resources (images, scripts, CSS, fonts, etc.) are fully loaded The requirement states:
"when the webpage is fully loaded (HTML content and all related files)" This aligns exactly with the window load event.
Implementation:
window.addEventListener("load", personalizeWebsiteContent);
This matches option B.
________________________________________
JavaScript knowledge references (text-only)
DOMContentLoaded fires after HTML parsing only.
load fires after all page resources finish loading.
The window object is the correct target for listening to the full load event.

NEW QUESTION # 25
Which statement allows a developer to update the browser navigation history without a page refresh?

A. window.history.pushState(newStateObject, '', null);
B. window.customHistory.pushState(newStateObject, '', null);
C. window.history.updateState(newStateObject, '');
D. window.history.createState(newStateObject, '');

Answer: B

NEW QUESTION # 26
Cloud Kicks has a class to represent items for sale in an online store, as shown below:
Class Item{
constructor (name, price){
this.name = name;
this.price = price;
}
formattedPrice(){
return 's' + String(this.price);}}
A new business requirement comes in that requests a ClothingItem class that should have all of the properties and methods of the Item class but will also have properties that are specific to clothes.
Which line of code properly declares the clothingItem class such that it inherits from Item?

A. Class ClothingItem super Item {
B. Class ClothingItem implements Item{
C. Class ClothingItem extends Item {
D. Class ClothingItem {

Answer: C

NEW QUESTION # 27
A developer has an ErrorHandler module that contains multiple functions.
What kind of export be leverages so that multiple functions can beused?

A. Named
B. Multi
C. Default
D. All

Answer: A

NEW QUESTION # 28
Which statement accurately describes an aspect of promises?

A. .then() cannot be added after a catch.
B. In a .then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
C. Arguments for the callback function passed to .then() are optional.
D. .then() manipulates and returns the original promise.

Answer: C

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Evaluate each option:
________________________________________
A . Arguments for .then() are optional.
This is correct.
.then() has the signature:
promise.then(onFulfilled?, onRejected?)
Both arguments (onFulfilled and onRejected) are optional.
If a callback is not supplied, JavaScript provides a default pass-through handler.
________________________________________
B . .then() cannot be added after a catch.
Incorrect.
Promises support chaining in any order:
promise
.catch(...)
.then(...);
After a catch, the chain continues normally.
________________________________________
C . .then() manipulates and returns the original promise.
Incorrect.
.then() always returns a new promise, not the original one.
This is fundamental to promise chaining behavior.
________________________________________
D . Returning values in .then() is not necessary.
Incorrect.
If you want the next .then() in the chain to receive a value, the current .then() must explicitly return it:
.then(value => {
return value * 2; // passes to next .then()
})
If nothing is returned, the next .then() receives undefined.
________________________________________
Why A is correct
It is the only statement that accurately describes built-in Promise behavior:
.then() accepts optional arguments.
________________________________________
JavaScript Knowledge Reference (text-only)
.then(onFulfilled?, onRejected?) accepts optional handlers.
Promise chaining creates new promises for each .then().
catch() can be followed by additional .then() calls.
Returning inside .then() passes values to the next step in the chain.

NEW QUESTION # 29
......

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