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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q145-Q150):

NEW QUESTION # 145
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. try{
ws.connect (( ) => {
console.log('connected to client'); });
C. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});
D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

Answer: D

Explanation:
} catch(error) { console.log('ERROR' , error); };
}

NEW QUESTION # 146
Which two code snippets show working examples of a recursive function?

A. let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
return startNumber;
}
};
(Note: Option D is shown here with corrected syntax: lowercase return and matching parentheses.)
B. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}
C. const factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
D. const sumToTen = numVar = > {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
};

Answer: A,C

Explanation:
A recursive function is a function that calls itself and has a base case to terminate the recursion.
Evaluate each option:
Option A:
const sumToTen = numVar = > {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
};
* This function calls itself: sumToTen(numVar + 1) - so it is recursive.
* However, the base condition is if (numVar < 0) return;.
* If you call sumToTen(0):
* numVar < 0 is false, so it calls sumToTen(1), then sumToTen(2), and so on, incrementing forever.
* There is no condition to stop the recursion when numVar increases; it will eventually cause a stack overflow.
* This code does not represent a properly working recursive function with a valid termination for increasing values and is not a good example of correct recursion.
Option B:
function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}
* This function does not call itself anywhere.
* It has conditional returns, but there is no recursive call such as factorial(numVar - 1).
* Therefore, it is not recursive at all.
Option C:
const factorial = numVar = > {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
* This is a classic recursive factorial implementation.
* It calls itself with a smaller argument: factorial(numVar - 1).
* Base cases:
* If numVar < 0, it simply returns (could be treated as invalid input).
* If numVar === 0, it returns 1, which is the mathematical definition of 0! (zero factorial).
* For positive integers, it correctly multiplies numVar by factorial(numVar - 1) until it reaches the base case.
This is a correct and working recursive function.
Option D (corrected):
let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
return startNumber;
}
};
* This function also calls itself: countingDown(startNumber - 1).
* Base case:
* When startNumber is not greater than 0 (i.e., 0 or negative), it returns startNumber and stops recursing.
* For example, countingDown(3) would:
* Log 3, call countingDown(2)
* Log 2, call countingDown(1)
* Log 1, call countingDown(0)
* At 0, it hits the else branch and returns 0, ending the recursion.
This is a valid working recursive function structure (once syntax is corrected).
Therefore, the snippets that show working recursive functions are:
The answer: C, D
Study Guide / Concept References (no links):
* Definition of recursion: a function calling itself
* Base case vs recursive step
* Recursive factorial implementation
* Recursive countdown example
* Importance of a terminating condition to avoid infinite recursion

NEW QUESTION # 147
Given the following code:

What is the output of line 02?

A. "undefined" 0
B. "x-
C. 'object"
D. "null"

Answer: C

NEW QUESTION # 148
Given the requirement to refactor the code above to JavaScript class format, which class definition is correct?

Answer: D

NEW QUESTION # 149
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the DOM inspector to remove all the elements containing the class ad-library-item.
B. Use the browser console to execute a script that prevents the load event to be fired.
C. Use the DOM inspector to prevent the load event to be fired.
D. Use the browser to execute a script that removes all the element containing the class ad-library-item.

Answer: D

NEW QUESTION # 150
......

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