Salesforce JS-Dev-101 Mock Exams | Test JS-Dev-101 Centres

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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:Salesforce
Exam Name:Salesforce Certified JavaScript Developer I - Multiple Choice Exam (JS-Dev-101)
Exam Number:JS-Dev-101
Certificate Validity Period:1 year (maintenance required annually in Salesforce certification program)
Real Exam Qty:60 (multiple choice)
Available Languages:English
Exam Duration:105 minutes
Passing Score:65%
Related Certifications:Salesforce Platform Developer I
Salesforce Platform Developer II
Exam Price:$200 USD
Exam Format:Multiple Choice Questions, Multiple Select Questions
Recommended Training:Salesforce Trailhead - JavaScript Developer I
MDN Web Docs - JavaScript Guide
Exam Registration:Salesforce Certification Registration
Kryterion Webassessor (Exam Delivery)
Sample Questions:Salesforce JS-Dev-101 Sample Questions
Exam Way:Online proctored exam via Salesforce authorized testing platform (e.g., Webassessor)
Pre Condition:No formal prerequisites, but familiarity with JavaScript and web development is recommended.
Official Syllabus URL:https://trailhead.salesforce.com/credentials/javascriptdeveloper

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As the tech industry continues to evolve and adapt to new technologies, professionals who hold the Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification are better equipped to navigate these changes and stay ahead of the curve, increasing their value to employers and clients. In today's fast-paced and ever-changing Salesforce sector, having the Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification has become a necessary requirement for individuals looking to advance their careers and stay competitive in the job market.

Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 2
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 3
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q25-Q30):

NEW QUESTION # 25
Given HTML below:
<div>
<div id ="row-uc"> UniversalContainer</div>
<div id ="row-aa">Applied Shipping</div>
<div id ="row-bt"> Burlington Textiles </div>
</div>
Which statement adds the priority = account CSS class to the universal Containers row ?

Answer: A


NEW QUESTION # 26
Refer to the code below:
console.log(''start);
Promise.resolve('Success') .then(function(value){
console.log('Success');
});
console.log('End');
What is the output after the code executes successfully?

Answer: D


NEW QUESTION # 27
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed to do some custom initialization when the webpage is fully loaded with HTML content and all related files.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

Answer: D

Explanation:
Comprehensive and Detailed Explanation From JavaScript Knowledge:
Two key browser events:
DOMContentLoaded (fired on document):
Fired when the HTML document has been completely loaded and parsed, without waiting for stylesheets, images, and subresources to finish loading.
load (fired on window):
Fired when the entire page is fully loaded, including all dependent resources such as stylesheets and images.
The requirement states:
"... when the webpage is fully loaded with HTML content and all related files." That matches the semantics of the load event on the window object.
So the correct code is:
window.addEventListener('load', personalizeWebsiteContent);
Why others are incorrect:
A: DOMContentLoaded fires earlier, when HTML is parsed, but before all related files (images, some styles, etc.) are guaranteed to be loaded.
B: 'onDOMContentLoaded' is not a valid event name; the event is 'DOMContentLoaded'.
D: When using addEventListener, the event type is 'load', not 'onload'. 'onload' is the name of the handler property (window.onload = ...), not the event string.
Relevant concepts: window.load event, DOMContentLoaded, addEventListener syntax, page load lifecycle.
________________________________________


NEW QUESTION # 28
Corrected code:
let obj = {
foo: 1,
bar: 2
};
let output = [];
for (let something in obj) {
output.push(something);
}
console.log(output);
What is the output of line 11?

Answer: D

Explanation:
The verified answer is C.
This object has two properties:
let obj = {
foo: 1,
bar: 2
};
The property names are:
foo
bar
The property values are:
1
2
The loop used here is a for...in loop:
for (let something in obj) {
output.push(something);
}
A for...in loop iterates over the property keys of an object, not the property values.
So during the first iteration:
something === "foo"
The code pushes "foo" into the array.
During the second iteration:
something === "bar"
The code pushes "bar" into the array.
The final value of output is:
["foo", "bar"]
That is why:
console.log(output);
prints:
["foo", "bar"]
Option B would be correct only if the code pushed the values, for example:
output.push(obj[something]);
Option D would require building formatted strings manually, such as:
output.push(`${something}:${obj[something]}`);
But the given code only pushes the property names.
Therefore, the verified answer is C.


NEW QUESTION # 29
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?

Answer: A,C


NEW QUESTION # 30
......

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