JavaScript-Developer-I Latest Exam Dumps | JavaScript-Developer-I Accurate Answers

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To prepare for the Salesforce JavaScript-Developer-I certification exam, candidates should have a solid understanding of JavaScript fundamentals, as well as experience working with Apex, Visualforce, and Lightning components. Salesforce offers a variety of resources to help candidates prepare for the exam, including self-study courses, instructor-led training, and practice exams.

Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Topic	Details
Topic 1	Asynchronous Programming: Asynchronous programming is a key concept in JavaScript, and this section tests your understanding of event loops, asynchronous code execution, and handling promises. Salesforce JavaScript programmer will need to demonstrate their ability to implement asynchronous solutions for business requirements.
Topic 2	Server Side JavaScript: This section focuses on Node.js and server-side JavaScript. Salesforce JavaScript programmers will be tested on their ability to identify appropriate Node.js implementations and commands for given scenarios. Additionally, you will need to recognize which Node.js core modules, libraries, and package management solutions fit specific requirements, reflecting your understanding of server-side development with JavaScript.
Topic 3	Testing: In the topic, you will be required to evaluate unit tests and improve them. The exam will assess your ability to identify ineffective tests and modify them to make them more robust and accurate. This topic ensures that you can write and maintain effective tests, a crucial skill for ensuring code quality and reliability in professional environments.
Topic 4	Objects, Functions, and Classes: In this section, the focus is on applying object-oriented principles, functions, and classes. As a Salesforce JavaScript programmer, you will need to locate optimal function implementations and understand how to structure objects and classes for business solutions. You will also be tested on your ability to use JavaScript modules and decorators, while analyzing variable scope and execution flow.
Topic 5	Variables, Types, and Collections: The topic will test how effectively JavaScript programmers can handle variable creation, initialization, type coercion, and data manipulation. You will need to demonstrate knowledge of strings, numbers, dates, arrays, and JSON handling. The Javascript Developer I exam will require a deep understanding of these concepts and their proper application in real-world scenarios.
Topic 6	Browser and Events: The topic will challenge your ability to work with events, event handlers, and the DOM. You will need to demonstrate how to manage event propagation and utilize browser-specific APIs. Additionally, proficiency in using browser developer tools to investigate code behavior will be tested, making it crucial for you to understand browser interactions thoroughly.

Salesforce JavaScript-Developer-I Certification Exam is an excellent way for individuals to demonstrate their expertise in developing custom applications on the Salesforce platform using JavaScript. With proper preparation and training, individuals can pass the exam and reap the benefits of this certification, including career advancement and increased earning potential.

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q136-Q141):

NEW QUESTION # 136
Given the HTML below:

Which statement adds the priority-account css class to the Applied Shipping row?

A. document.querySelector('#row-as').classList.add('priority-account');

Answer: A

NEW QUESTION # 137
Refer to the code below (corrected to use a template literal on line 08):
01 let car1 = new Promise((_, reject) = >
02 setTimeout(reject, 2000, " Car 1 crashed in " )
03 );
04 let car2 = new Promise(resolve = >
05 setTimeout(resolve, 1500, " Car 2 completed " )
06 );
07 let car3 = new Promise(resolve = >
08 setTimeout(resolve, 3000, " Car 3 completed " )
09 );
10
11 Promise.race([car1, car2, car3])
12 .then(value = > {
13 let result = `${value} the race.`;
14 })
15 .catch(err = > {
16 console.log( " Race is cancelled. " , err);
17 });
What is the value of result when Promise.race executes?

A. Race is cancelled.
B. Car 2 completed the race.
C. Car 1 crashed in the race.
D. Car 3 completed the race.

Answer: B

Explanation:
Understand the three promises:
* car1:
let car1 = new Promise((_, reject) = >
setTimeout(reject, 2000, " Car 1 crashed in " )
);
* Rejects after 2000 ms (2 seconds) with message " Car 1 crashed in " .
* car2:
let car2 = new Promise(resolve = >
setTimeout(resolve, 1500, " Car 2 completed " )
);
* Resolves after 1500 ms (1.5 seconds) with message " Car 2 completed " .
* car3:
let car3 = new Promise(resolve = >
setTimeout(resolve, 3000, " Car 3 completed " )
);
* Resolves after 3000 ms (3 seconds) with message " Car 3 completed " .
Promise.race:
Promise.race([car1, car2, car3])
then(value = > {
let result = `${value} the race.`;
})
catch(err = > {
console.log( " Race is cancelled. " , err);
});
Behavior of Promise.race:
* It settles (resolves or rejects) as soon as any of the given promises settles.
* It uses the value or reason from the first settled promise.
Timing:
* car2 resolves in 1500 ms.
* car1 rejects in 2000 ms.
* car3 resolves in 3000 ms.
The first to settle is car2 at 1500 ms, with value " Car 2 completed " .
Therefore:
* Promise.race resolves (not rejects) with value = " Car 2 completed " .
* The .then handler runs; .catch is ignored because there is no rejection.
Inside .then:
let result = `${value} the race.`;
Substitute value:
let result = " Car 2 completed the race. " ;
So, result becomes:
Car 2 completed the race.
Compare to options:
* A. Car 3 completed the race.
* This would be correct if car3 were the first to resolve, which it is not (it resolves last).
* B. Car 2 completed the race.
* Exactly matches the first-resolving promise and the constructed message.
* C. Race is cancelled.
* This is the prefix of the string logged in the .catch handler, but .catch never runs because the race resolves, it does not reject first.
* D. Car 1 crashed in the race.
* car1 is the first rejection , but since a resolution from car2 happens earlier, the race is already settled successfully before car1 rejects.
Thus the correct value of result as set in the .then block is:
The answer: B
Study Guide / Concept References (no links):
* Promise.race(iterable) semantics (first settled promise wins)
* setTimeout and timing interactions with Promises
* Resolve vs reject paths and .then / .catch
* Template literals and string interpolation for building result messages

NEW QUESTION # 138
Given the JavaScript below:

Which code should replace the placeholder comment on line 06 to hide accounts that do not match the search string?

A. 'None' : 'block'
B. 'Block' : 'none'
C. 'Visible : 'hidden'
D. 'Hidden, visible

Answer: B

NEW QUESTION # 139
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Whichcode should be inserted at the line 03 to set up an event and start the web server ?

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

Answer: B

NEW QUESTION # 140
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not
a reference to arr1?

A. Let arr2 = arr1;
B. Let arr2 = Array.from(arr1);
C. Let arr2 = arr1.sort();
D. Let arr2 = arr1.slice(0, 5);

Answer: B,D

NEW QUESTION # 141
......

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