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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
Related Certifications:Lightning Web Components Specialist Superbadge
Salesforce Certified JavaScript Developer I
Exam Price:$200 USD
Exam Format:Multiple Choice, Multiple Select
Real Exam Qty:60 (plus up to 5 unscored pilot questions)
Passing Score:65%
Exam Duration:105 minutes
Certificate Validity Period:Lifetime (No renewal required)
Available Languages:English
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:

TopicDetails
Topic 1
  • Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 2
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3
  • 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 4
  • Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 5
  • Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 6
  • 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 (Q98-Q103):

NEW QUESTION # 98
Given the JavaScript below:
01 function filterDOM (searchString) {
02 const parsedSearchString = searchString && searchString.toLowerCase() ;
03 document.quesrySelectorAll(' .account' ) . forEach(account => (
04 const accountName = account.innerHTML.toLOwerCase();
05 account. Style.display = accountName.includes(parsedSearchString) ? /*Insert code*/;
06 )};
07 }
Which code should replace the placeholder comment on line 05 to hide accounts that do not match thesearch string?

Answer: B


NEW QUESTION # 99
A developer is working on an ecommerce website where the delivery date is dynamically calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's date + 9 days.
Which code meets thisnew requirement?

Answer: D


NEW QUESTION # 100
Which three actions can the code execute in the browser console?

Answer: B,D,E

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge The browser console (Developer Tools → Console) allows:
Running code unrelated to the page
Developers can type arbitrary JavaScript not tied to the page's logic.
This is allowed → A is correct.
Viewing and modifying JavaScript code execution
Using the Sources tab and console, developers can:
Inspect variables
Modify code at runtime
Set breakpoints
Therefore → D is correct.
Viewing and manipulating the DOM
From the console, developers can:
Query DOM nodes using selectors
Modify element properties and attributes
Insert or remove elements
Therefore → E is correct.
Why the other options are incorrect:
B (security cookies)
Many cookies have flags such as HttpOnly and Secure.
Cookies with the HttpOnly flag cannot be viewed or modified via JavaScript or console.
Therefore this is not guaranteed → incorrect.
C (performance report)
The console itself does not provide a performance report.
The Performance or Lighthouse tabs provide this, not the console.
Therefore incorrect.
________________________________________
JavaScript Knowledge Reference (text-only)
Developer console can execute arbitrary JavaScript.
Console allows DOM inspection and manipulation.
Security cookies (HttpOnly) cannot be accessed via JavaScript.


NEW QUESTION # 101
Refer to the following code:
function test (val) {
If (val === undefined) {
return 'Undefined values!' ;
}
if (val === null) {
return 'Null value! ';
}
return val;
}
Let x;
test(x);
What is returned by the function call on line 13?

Answer: B


NEW QUESTION # 102
Which three browser specific APIs are available for developers to persist data between page loads ?
Choose 3 answers

Answer: B,C,D


NEW QUESTION # 103
......

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