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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	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	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 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 5	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.

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Free PDF 2026 JS-Dev-101: Efficient Salesforce Certified JavaScript Developer - Multiple Choice Exam Score

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q112-Q117):

NEW QUESTION # 112
Which two code snippets showworking examples of a recursive function?
Choose 2 answers

A. Function factorial ( numVar ) {If (numVar < 0) return;If ( numVar === 0 ) return 1;return numVar -1;
B. Const sumToTen = numVar => {If (numVar < 0)Return;return sumToTen(numVar + 1)};
C. Const factorial =numVar => {If (numVar < 0) return;If ( numVar === 0 ) return 1;returnnumVar * factorial ( numVar - 1 );};
D. Let countingDown = function(startNumber) {If ( startNumber >0) {console.log(startNumber) ;return countingDown(startNUmber);} else {return startNumber;}};

Answer: C,D

NEW QUESTION # 113
Refer to the code below:
01 const server = require('server');
02
03 // Insert code here
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?

A. server((port) => { console.log('Listening on', port); });
B. server.on('connect', (port) => { console.log('Listening on', port); });
C. server.start();
D. server();

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
The question specifies:
The library "uses events and callbacks to start the server".
We want to "set up an event and start the web server".
Option C:
server((port) => { console.log('Listening on', port); });
This:
Calls server(...), which (by design in such libraries) typically starts the web server.
Passes a callback function that receives port when the server is ready.
Inside the callback, it logs "Listening on <port>".
This matches the "events and callbacks" description: the callback is invoked when the server has started listening.
Why others are incorrect:
A . server.on('connect', ...)
Assumes server is an event emitter instance with a 'connect' event, which is not given. Also, this line alone would not start the server.
B . server.start();
Assumes a start method exists; the question says the library "uses events and callbacks to start," implying invocation with a callback, not a plain start() call.
D . server();
Might start the server, but does not "set up an event" or callback to know when or where it is listening.
Therefore, C aligns with the described usage.
Concepts: callback-based APIs, starting servers with callbacks, event/callback style vs simple method calls.

NEW QUESTION # 114
A developer has two ways to write a function:
Option A:
function Monster(){
this.growl = ()=>{
console.log('Grr!');
}
}
Option B:
function Monster(){};
Monster.prototype.growl = ()=>{
console.log('Grr!');
}
After deciding on an option, the developercreates 1000 monster objects.
How many growl methods are created with Option A and Option B?

A. 1000 for Option A, 1 for Option B
B. 1000 for both
C. 1 methods for both
D. 1 for Option A, 1000 for Option B

Answer: C

NEW QUESTION # 115
A test searches for:
<button class="blue">Checkout</button>
But the actual HTML is:
<button>Checkout</button>
The test fails because it expects a class that no longer exists.
What type of test outcome is this?

A. True positive
B. False negative
C. True negative
D. False positive

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Definitions:
False negative → The test reports a failure even though the feature actually works.
False positive → The test reports success when it should not.
True positive → Correctly identifies something is working.
True negative → Correctly identifies something is not working.
In this scenario:
The checkout button does exist, so the feature works.
The test fails incorrectly, because it is checking for the wrong selector.
That is the definition of a false negative.
________________________________________
JavaScript Knowledge Reference (text-only)
Test outcome classification: false negative = feature works but test fails.

NEW QUESTION # 116
A Node.js server library uses events and callbacks. The developer wants to log any issues the server has at boot time.
Which code logs an error with an event?

A. server.on('error', (error) => {
console.log('ERROR', error);
});
B. try {
server.start();
} catch(error) {
C. server.error('error) => {
console.log('ERROR', error);
});
D. server.catch('error) => {
console.log('ERROR', error);
});

Answer: A

Explanation:
console.log('ERROR', error);
}
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Node.js event-based modules use the EventEmitter pattern.
The correct syntax for listening to events is:
emitter.on('eventName', callback)
The server library emits an 'error' event, which must be listened to using .on.
Option analysis:
A: .catch is for Promises, not EventEmitters.
B: .error is not an EventEmitter method.
C: Correct. Listens to the 'error' event.
D: try...catch only captures synchronous errors, not event-based asynchronous errors.
Therefore, the correct answer is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
The EventEmitter API uses on(event, handler) to listen for events.
Errors emitted asynchronously cannot be caught with try...catch.
The 'error' event is standard for Node.js modules to signal operational errors.

NEW QUESTION # 117
......

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