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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- Object creation and manipulation - Arrow functions - Higher-order functions - Function declarations and expressions - ES6 classes and inheritance - Variable scope and closures - Prototypal inheritance - Execution flow and context - Modules and decorators
Topic 2: Browser and Events	17%	- Browser Developer Tools usage - Event propagation (bubbling and capturing) - Browser-specific APIs - Interacting with forms and user input - DOM manipulation - Event handling and listeners
Topic 3: Server Side JavaScript	8%	- Server-side JavaScript implementations - Core Node.js modules - CLI commands - Package management (npm) - Node.js fundamentals
Topic 4: Variables, Types, and Collections	23%	- Strings, numbers, and dates - JSON parsing and manipulation - Truthy and falsy evaluations - Variable declarations and initialization - Type coercion and conversion - Arrays and collections - Primitive and complex data types
Topic 5: Testing	7%	- Test coverage and reliability - Test effectiveness evaluation - Unit testing concepts - Writing and modifying unit tests
Topic 6: Asynchronous Programming	13%	- Async/Await syntax - Callbacks - Event loop and execution flow - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling)
Topic 7: Debugging and Error Handling	7%	- Breakpoints and code inspection - Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally)

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q113-Q118):

NEW QUESTION # 113
Refer to the following code that performs a basic mathematical operation on a provided
input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);

A. Return Number(num + 10) / 3;
B. Return Integer(num +10) /3;
C. Return Number((num +10) /3 );
D. Return (Number (num +10 ) / 3;

Answer: D

NEW QUESTION # 114
Given the JavaScript below:
01 function filterDOM(searchString){
02 const parsedSearchString = searchString & & searchString.toLowerCase();
03 document.querySelectorAll( ' .account ' ).forEach(account = > {
04 const accountName = account.innerHTML.toLowerCase();
05 account.style.display = accountName.includes(parsedSearchString) ? /* Insert code here */;
06 });
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

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

Answer: A

Explanation:
We have a ternary:
account.style.display = accountName.includes(parsedSearchString)
? /* if true */
/* if false */;
Requirement:
* If the account matches the search string # show it.
* If it does not match # hide it.
For display:
* Show: ' block ' (or similar visible value).
* Hide: ' none ' .
So we want:
account.style.display = accountName.includes(parsedSearchString)
? ' block '
' none ' ;
That corresponds to option A.
Why others are wrong:
* B, C use values suitable for visibility, not display.
* D ( ' none ' : ' block ' ) inverts the logic, hiding matches and showing non-matches.

NEW QUESTION # 115
Refer to the following code that performs a basic mathematical operation on a provided input:
function calculate(num) {
Return (num +10) / 3;
}
How should line 02 be written to ensure that x evaluates to 6 in the line below?
Let x = calculate (8);

A. Return Number(num + 10) / 3;
B. Return Integer(num +10) /3;
C. Return Number((num +10) /3 );
D. Return (Number (num +10 ) / 3;

Answer: D

NEW QUESTION # 116
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to the server Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
C. try{
ws.connect (( ) => {
console.log('connected to client'); });
} catch(error) { console.log('ERROR' , error); };
}
D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

Answer: D

NEW QUESTION # 117
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new
username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is
executed and getAvailability("newUserName") returns false?

A. undefined
B. "Username available"
C. "newUserName"
D. "Msg is not defined"

Answer: A

NEW QUESTION # 118
......

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