What's more, part of that TrainingDumps JS-Dev-101 dumps now are free: https://drive.google.com/open?id=1TPcjpd1iUucxbF9sKtBuqAzoRY66VA3Z
Are you still worried about not passing the JS-Dev-101 exam? Do you want to give up because of difficulties and pressure when reviewing? You may have experienced a lot of difficulties in preparing for the exam, but fortunately, you saw this message today because our well-developed JS-Dev-101 Study Materials will help you tide over all the difficulties. As a multinational company, our JS-Dev-101 study materials serve candidates from all over the world. No matter which country you are currently in, you can be helped by our JS-Dev-101 study materials.
| Certification Vendor: | Salesforce |
|---|---|
| Exam Name: | Salesforce Certified JavaScript Developer I |
| Exam Number: | JS-Dev-101 |
| Exam Price: | $200 USD |
| Available Languages: | English |
| Exam Duration: | 105 minutes |
| Exam Format: | Multiple Select, Multiple Choice |
| Certificate Validity Period: | Lifetime (No renewal required) |
| Real Exam Qty: | 60 (plus up to 5 unscored pilot questions) |
| 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 |
So rest assured that with the TrainingDumps Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) practice questions you will not only make the entire Salesforce JS-Dev-101 exam dumps preparation process and enable you to perform well in the final Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification exam with good scores. To provide you with the updated Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam questions the TrainingDumps offers three months updated Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam dumps download facility. Now you can download our updated JS-Dev-101 practice questions up to three months from the date of TrainingDumps Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam purchase.
| Topic | Details |
|---|---|
| Topic 1 |
|
| Topic 2 |
|
| Topic 3 |
|
NEW QUESTION # 140
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?
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 # 141
Refer to the code:
01 console.log('Start');
02 Promise.resolve('Success').then(function(value) {
03 console.log('Success');
04 });
05 console.log('End');
What is the output after the code executes successfully?
Answer: C
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge console.log('Start') runs immediately (synchronous).
Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
console.log('End') runs next (still synchronous).
After the synchronous script finishes, the microtask queue runs, logging "Success".
Execution order:
Start
End
Success
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise .then() callbacks execute after the current call stack finishes (microtask queue).
Synchronous logs run immediately, before promise callbacks.
NEW QUESTION # 142
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?
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 # 143
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."?
Answer: C
NEW QUESTION # 144
A class was written to represent regular items and sale items. Code:
01 let regItem = new Item('Scarf', 55);
02 let saleItem = new SaleItem('Shirt', 80, .1);
03 Item.prototype.description = function() { return 'This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return 'This is a discounted ' + this.name; }
08 console.log(regItem.description());
09 console.log(saleItem.description());
What is the output?
Answer: B
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge At line 03, the developer assigns:
Item.prototype.description = function() { return 'This is a ' + this.name; } This affects all objects whose prototype chain includes Item.prototype.
regItem inherits from Item → gets this method.
saleItem, as an instance of SaleItem, also inherits Item.prototype (since SaleItem uses prototype inheritance from Item), so it also has this method at this moment.
Outputs at lines 04 and 05:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a Shirt"
At line 07, the developer overrides the method on SaleItem.prototype:
SaleItem.prototype.description = function() {
return 'This is a discounted ' + this.name;
}
From this point:
regItem still uses the Item.prototype version
saleItem uses the overridden SaleItem.prototype version
Outputs at lines 08 and 09:
regItem.description() → "This is a Scarf"
saleItem.description() → "This is a discounted Shirt"
Combining all results:
This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Objects created from constructor functions use prototype chaining.
Overriding a subclass prototype method does not affect the parent class prototype.
Instances inherit the most specific version of the method on their prototype chain.
NEW QUESTION # 145
......
Valid JS-Dev-101 Dumps: https://www.trainingdumps.com/JS-Dev-101_exam-valid-dumps.html
BTW, DOWNLOAD part of TrainingDumps JS-Dev-101 dumps from Cloud Storage: https://drive.google.com/open?id=1TPcjpd1iUucxbF9sKtBuqAzoRY66VA3Z