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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript
Topic 2: Asynchronous JavaScript	- Event loop and concurrency model - Error handling in async workflows - Promises and async/await
Topic 3: Testing and Debugging	- Debugging techniques and tools - Unit testing principles
Topic 4: JavaScript Language Fundamentals	- ES6+ syntax and features - Data types, variables, and operators - Functions, scope, and closures
Topic 5: Browser and DOM Interaction	- Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers)

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q94-Q99):

NEW QUESTION # 94
A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students who scored more than 15 points.
How should the developer implement the request?

A. Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
B. Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
C. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));
D. Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))

Answer: B

NEW QUESTION # 95
developer is trying to convince management that their team will benefit from using
Node.js for a backend server that they are going to create. The server will be a web server that
handles API requests from a website that the team has already built using HTML, CSS, and
JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Performs a static analysis on code before execution to look for runtime errors.
B. User non blocking functionality for performant request handling .
C. I nstalls with its own package manager to install and manage third-party libraries.
D. Ensures stability with one major release every few years.
E. Executes server-side JavaScript code to avoid learning a new language.

Answer: A,B,C

NEW QUESTION # 96
Considering type coercion, What does the following expression evaluate to?
True + ) + '100 ' + null

A. 0
B. '3100null'
C. '4100null'
D. 1

Answer: C

NEW QUESTION # 97
Refer to the code below:
01 let first = ' Who ' ;
02 let second = ' What ' ;
03 try {
04 try {
05 throw new Error( ' Sad trombone ' );
06 } catch (err) {
07 first = ' Why ' ;
08 throw err;
09 } finally {
10 second = ' When ' ;
11 }
12 } catch (err) {
13 second = ' Where ' ;
14 }
What are the values for first and second once the code executes?

A. first is Who and second is Where.
B. first is Who and second is When.
C. first is Why and second is When.
D. first is Why and second is Where.

Answer: D

Explanation:
Initial values:
* first = ' Who '
* second = ' What '
Execution:
Inner try/catch/finally:
* Line 05: throw new Error( ' Sad trombone ' );
* Control goes to the inner catch.
* Inner catch (lines 06-08):
catch (err) {
first = ' Why ' ;
throw err;
}
* first is set to ' Why ' .
* The error is rethrown.
* Inner finally (lines 09-11):
finally {
second = ' When ' ;
}
* finally runs whether or not there was an error.
* second becomes ' When ' .
After inner finally, the rethrown error continues to propagate to the outer catch.
Outer catch (lines 12-14):
} catch (err) {
second = ' Where ' ;
}
* Because the inner try rethrew, the outer catch runs.
* It sets second = ' Where ' .
Final values:
* first was changed to ' Why ' in the inner catch and never changed again.
* second became ' When ' in the inner finally, and then ' Where ' in the outer catch.
So:
* first is ' Why '
* second is ' Where '
Option B is correct.
Concepts: nested try/catch/finally, rethrowing errors, order of execution for catch vs finally, variable mutation through error propagation.

NEW QUESTION # 98
Refer to the code below:
Let textvalue = '1984';
Which code segment shows a correct way to convert this string to an integer?

A. Let numberValue = Number(textvalue);
B. Let numberValue = (Number) textvalue;
C. Let numberValue = Integer ( textValue );
D. Let numberValue = textValue. Tointeger ( ) ;

Answer: A

NEW QUESTION # 99
......

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