JS-Dev-101 Dumps Guide: Salesforce Certified JavaScript Developer - Multiple Choice & JS-Dev-101 Actual Test & JS-Dev-101 Exam Torrent

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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:Salesforce
Exam Name:Salesforce Certified JavaScript Developer - Multiple Choice
Exam Number:JS-Dev-101
Certificate Validity Period:Does not expire; requires maintenance updates
Exam Price:USD 200
Related Certifications:Salesforce Certified Developer
Salesforce Certified Platform Developer I
Passing Score:65%
Available Languages:English, Japanese
Exam Format:Multiple choice, Multiple select
Real Exam Qty:60 scored + up to 5 unscored
Exam Duration:105 minutes
Recommended Training:Trailhead JavaScript Developer I Certification Prep
Exam Registration:Salesforce Certification Registration
Sample Questions:Salesforce JS-Dev-101 Sample Questions
Exam Way:Online proctored or onsite at authorized testing centers
Pre Condition:No formal prerequisites; recommended: strong JavaScript fundamentals, ES6+ experience, web development familiarity
Official Syllabus URL:https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101

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Salesforce JS-Dev-101 Exam Syllabus Topics:

TopicDetails
Topic 1
  • 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 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.
Topic 4
  • Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
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 (Q123-Q128):

NEW QUESTION # 123
Why does second have access to variable a?

Answer: A

Explanation:
The variable a is declared in the outer function's scope. An inner function (second) forms a closure over its outer lexical scope, so it can access a. The reason is the scope chain / outer function's scope, not prototypes or hoisting.


NEW QUESTION # 124
Refer to the code declarations below:
Which three expressions return the string JavaScript?
Choose 3 answers

Answer: A,B,D


NEW QUESTION # 125
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string indexvalues, the value of str is 'javascript'. What is the reason for this value:

Answer: C


NEW QUESTION # 126
Original code:
01 let requestPromise = client.getRequest;
03 requestPromise().then((response) => {
04 handleResponse(response);
05 });
The developer wants to gracefully handle errors from a Promise-based GET request.
Which code modification is correct?

Answer: A

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge Key JavaScript Promise rule:
try...catch does not catch asynchronous errors that occur in Promise chains.
Therefore, the correct way to handle errors in a Promise is:
promise.then(...).catch(...);
Analysis of options:
A and B:
Both wrap asynchronous code in try...catch, which does not catch Promise rejections.
try...catch only catches errors thrown synchronously inside the block.
C:
Correct. A .catch() on the Promise chain handles any error from the Promise returned by requestPromise().
D:
.finally() executes regardless of success or failure, but it does not receive the error object, so it cannot handle the error.
Thus the only valid solution is option C.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise rejections must be handled with .catch().
try...catch only handles synchronous code.
.finally() does not receive a rejection reason.


NEW QUESTION # 127
Which actions can be done using the JavaScript browser console?

Answer: A,D,E

Explanation:
A: Yes. You can run arbitrary JS in the console (even if it doesn't touch the page).
B: Yes. You can inspect and modify DOM nodes via JS.
C: Performance reports are mainly in the Performance tab, not the console.
D: Yes. You can alter the DOM and redefine or override JS functions/variables at runtime.
E: You can read and set document.cookie, but HttpOnly "security cookies" cannot be read or changed from JS.


NEW QUESTION # 128
......

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