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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I
Exam Number:	JS-Dev-101
Exam Duration:	105 minutes
Exam Price:	$200 USD
Real Exam Qty:	60 (plus up to 5 unscored pilot questions)
Certificate Validity Period:	Lifetime (No renewal required)
Exam Format:	Multiple Select, Multiple Choice
Available Languages:	English
Passing Score:	65%
Related Certifications:	Lightning Web Components Specialist Superbadge Salesforce Certified JavaScript Developer I
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online (Proctored)
Pre Condition:	Completion of the Lightning Web Components Specialist Superbadge is required to earn the full credential, though it can be completed before or after the exam.
Official Syllabus URL:	https://trailhead.salesforce.com/en/credentials/javascriptdeveloperi

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
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	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 4	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 5	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.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q95-Q100):

NEW QUESTION # 95
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing " Tony" to "Mr. T."?

A. document.querySelector('$main li.Tony').innerHTML = ' Mr. T. ';
B. document.querySelectorAll('$main $TONY').innerHTML = ' Mr. T. ';
C. document.querySelector('$main li:nth-child(2)'),innerHTML =' Mr. T. ';
D. document.querySelector('$main li:second-child').innerHTML = ' Mr. T. ';

Answer: C

NEW QUESTION # 96
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 `ws`.
The developer also wants to add error logging if a connection fails.
Given this information, which code segment shows the correct way to set up a client with two events that listen at execution time?

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

Answer: A,C

Explanation:
}

NEW QUESTION # 97
Refer to the HTML below:
<div id="main">
<ul>
<li>Leo</li>
<li>Tony</li>
<li>Tiger</li>
</ul>
</div>
Which JavaScript statement results in changing "Leo" to "The Lion"?

A. document.querySelectorAll('#main #Leo').innerHTML = 'The Lion';
B. document.querySelector('#main li:second-child').innerHTML = 'The Lion';
C. document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion';
D. document.querySelectorAll('#main li,Leo').innerHTML = 'The Lion';

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge:
We want to select the first <li> under #main and change its content.
document.querySelector(selector) returns the first element matching the CSS selector.
In the DOM, the <li> elements under <ul> are children in order:
1st child: "Leo"
2nd child: "Tony"
3rd child: "Tiger"
li:nth-child(1) is the CSS pseudo-class that selects the first <li> inside its parent.
So:
document.querySelector('#main li:nth-child(1)').innerHTML = 'The Lion'; selects the first <li> ("Leo") inside #main and sets its innerHTML to "The Lion".
Why others are incorrect:
A . #main #Leo
There is no element with id "Leo". id is not set on the <li>, so the selector matches nothing.
B . li:second-child
There is no :second-child pseudo-class. The valid pseudo-class is :nth-child(2); and that would select "Tony", not "Leo".
C . '#main li,Leo'
This selector means "all #main li and all elements named <Leo>".
There is no <Leo> tag, and querySelectorAll returns a NodeList, which does not have a single innerHTML property.
Therefore, D is the correct statement.
Study Guide Concepts:
document.querySelector vs querySelectorAll
CSS selectors: nth-child()
DOM element innerHTML property
________________________________________

NEW QUESTION # 98
Corrected code:
function Person() {
this.firstName = "John";
}
Person.prototype = {
job: x => "Developer"
};
const myFather = new Person();
const result = myFather.firstName + " " + myFather.job();
What is the value of result after line 10 executes?

A. Error: myFather.job is not a function
B. "undefined Developer"
C. "John undefined"
D. "John Developer"

Answer: D

Explanation:
The verified answer is A.
This constructor function runs when new Person() is called:
function Person() {
this.firstName = "John";
}
So this line:
const myFather = new Person();
creates an object like this:
{
firstName: "John"
}
Then the prototype is assigned a method named job:
Person.prototype = {
job: x => "Developer"
};
Because myFather is created from Person, it can access properties and methods from Person.prototype.
So:
myFather.firstName
returns:
"John"
And:
myFather.job()
returns:
"Developer"
Therefore:
const result = myFather.firstName + " " + myFather.job();
becomes:
const result = "John" + " " + "Developer";
Final value:
"John Developer"
Option B is incorrect because job() returns "Developer", not undefined.
Option C is incorrect because job exists on Person.prototype, so it is callable.
Option D is incorrect because firstName is assigned inside the constructor.
Therefore, the verified answer is A.

NEW QUESTION # 99
A developer is setting up a Node,js server and is creating a script at the root of the source code, index,js, that will start the server when executed. The developer declares a variable that needsthe folder location that the code executes from.
Which global variable can be used in the script?

A. this.path
B. _filename
C. window.location
D. _dirname

Answer: B

NEW QUESTION # 100
......

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