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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Variables, Types, and Collections	23%	- Variable declarations and initialization - JSON parsing and manipulation - Arrays and collections - Truthy and falsy evaluations - Type coercion and conversion - Strings, numbers, and dates - Primitive and complex data types
Asynchronous Programming	13%	- Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Event loop and execution flow - Async/Await syntax - Callbacks
Debugging and Error Handling	7%	- Error handling techniques (try/catch/finally) - Console methods for debugging - Breakpoints and code inspection - Custom error types
Browser and Events	17%	- Event handling and listeners - Interacting with forms and user input - Browser-specific APIs - Event propagation (bubbling and capturing) - DOM manipulation - Browser Developer Tools usage
Server Side JavaScript	8%	- Package management (npm) - Node.js fundamentals - CLI commands - Core Node.js modules - Server-side JavaScript implementations
Objects, Functions, and Classes	25%	- Modules and decorators - ES6 classes and inheritance - Arrow functions - Object creation and manipulation - Higher-order functions - Function declarations and expressions - Execution flow and context - Prototypal inheritance - Variable scope and closures
Testing	7%	- Unit testing concepts - Test coverage and reliability - Writing and modifying unit tests - Test effectiveness evaluation

>> JavaScript-Developer-I Lab Questions <<

100% Pass 2026 Salesforce JavaScript-Developer-I: Valid Salesforce Certified JavaScript Developer (JS-Dev-101) Lab Questions

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q108-Q113):

NEW QUESTION # 108
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?

A. import printDate from ' /path/DatePrettyPrint.js ' ;
printDate();
B. import printDate from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();
C. import DatePrettyPrint() from ' /path/DatePrettyPrint.js ' ;
printDate();
D. import DatePrettyPrint from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();

Answer: A

Explanation:
ES Modules follow these rules:
* Default exports are imported using:
* import anyName from ' module '
The name chosen in the import does NOT need to match the exported name.
* If a module exports:
* export default function printDate() {}
then consuming code should import the function directly:
import printDate from ' /path/DatePrettyPrint.js ' ;
* To execute it:
* printDate();
Option analysis:
* A incorrect: import DatePrettyPrint() is invalid syntax. Also calling printDate() without importing it is incorrect.
* B incorrect: A default export imported as DatePrettyPrint gives the function itself, not an object containing methods. You cannot call DatePrettyPrint.printDate().
* C incorrect: Imports printDate but then calls DatePrettyPrint.printDate(), which does not exist.
* D correct: Correct import of a default-exported function. Correct direct invocation.
JavaScript Knowledge References (text-only)
* Default export # imported without braces.
* Importing default functions gives a callable function, not an object.
* Correct syntax: import identifier from " module " .

NEW QUESTION # 109
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..

What is the output when executing the code above

A. 50
80
72
B. 50
80
Uncaught Reference Error:this,discount is undefined
72
C. 50
Uncaught TypeError: saleItem,desrcription is not a function
50
80
D. 50
80
50
72

Answer: D

NEW QUESTION # 110
Given the JavaScript below:
01 function filterDOM (searchString) {
02 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(' .account' ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert
code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do
not match the search string?

A. ' hidden ' : ' visible '
B. ' Block ' : ' none '
C. ' name ' : ' block '
D. ' visible ' : ' hidden '

Answer: B

NEW QUESTION # 111
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading a game : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game : $(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the method ?
> SNEGeneziz is loading a cartridge game: Super Monic 3x Force . . .

A. Console16bit.prototype.load = function(gamename) {
B. Console16bit.prototype.load(gamename) {
C. Console16bit = Object.create(GameConsole.prototype).load = function
(gamename) {
D. Console16bit.prototype.load(gamename) = function() {

Answer: A

NEW QUESTION # 112
A developer implements a function that adds a few values.

Which three options can the developer invoke for this function to get a return vale of 10? Choose 3 answers

A. Sum (5, 5) ()
B. Sum () (10)
C. Sum () (5, 5)
D. Sum (5) (5)
E. Sum (10) ()

Answer: B,C,D

NEW QUESTION # 113
......

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