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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 2	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 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	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 6	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q70-Q75):

NEW QUESTION # 70
Which two console logs output NaN?
Choose 2 answers | |

A. console.log(parseInt ' ("two')) ;
B. console.log(10 / 0);
C. console.log(10 / Number('5) ) ;
D. console.loeg(10 / 'five');

Answer: A,C

NEW QUESTION # 71
A developer wants to set up a secure web server with Node.js. The developer creates a directory locally called app-server, and the first file is app-server/index.js.
Without using any third-party libraries, what should the developer add to index.js to create the secure web server?

A. const https = require('https');
B. const http = require('http');
C. const server = require('secure-server');
D. const tls = require('tls');

Answer: A

NEW QUESTION # 72
Given the following code:
Counter = 0;
const logCounter = () => {
console.log(counter);
);
logCounter();
setTimeout(logCOunter, 1100);
setInterval(() => {
Counter++
logCounter();
}, 1000);
What is logged by the first four log statements?

A. 0 1 2 3
B. 0 1 1 2
C. 0 1 2 2
D. 0 0 1 2

Answer: B

NEW QUESTION # 73
Refer to the following code block (with corrected template literals using backticks):
01 class Animal {
02 constructor(name) {
03 this.name = name;
04 }
05
06 makeSound() {
07 console.log(`${this.name} is making a sound.`);
08 }
09 }
10
11 class Dog extends Animal {
12 constructor(name) {
13 super(name);
14 this.name = name;
15 }
16 makeSound() {
17 console.log(`${this.name} is barking.`);
18 }
19 }
20
21 let myDog = new Dog('Puppy');
22 myDog.makeSound();
What is the console output?

A. > Puppy is barking.
B. > Undefined
C. > Uncaught ReferenceError

Answer: A

Explanation:
Animal class:
Has a constructor that sets this.name.
Has a makeSound method that logs a message using this.name.
Dog class:
Extends Animal.
Its constructor calls super(name) to run the parent constructor, which sets this.name.
It overrides makeSound() to log:
console.log(`${this.name} is barking.`);
Instantiation:
let myDog = new Dog('Puppy');
myDog.makeSound();
new Dog('Puppy'):
Calls Dog constructor with name = 'Puppy'.
Inside, super(name) sets this.name = 'Puppy' in the Animal constructor.
Then this.name = name; in the Dog constructor keeps it as 'Puppy'.
myDog.makeSound():
Calls the overridden makeSound() in Dog.
Logs: "Puppy is barking."
No reference errors, no undefined; the output is:
Puppy is barking.
Study Guide Concepts:
ES6 classes and inheritance (extends)
super() in subclass constructors
Method overriding in subclasses
Template literals: `${this.name} ...`

NEW QUESTION # 74
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.on('connect', (port) => { console.log('Listening on', port); });
B. server((port) => { console.log('Listening on', port); });
C. server.start();
D. server();

Answer: B

Explanation:
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 # 75
......

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