Valid JS-Dev-101 Test Blueprint | JS-Dev-101 Certification

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 2	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 3	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.

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JS-Dev-101 Certification - JS-Dev-101 Hot Questions

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q133-Q138):

NEW QUESTION # 133
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?

A. try/catch around requestPromise().then(...)
B. Add .catch to the Promise chain
C. Use finally handler for errors
D. (duplicate of A)

Answer: B

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 # 134
A developer needs to test this function:
01const sum3 = (arr) => (
02if (!arr.length) return 0,
03if (arr.length === 1) return arr[0],
04if (arr.length === 2) return arr[0]+ arr[1],
05 return arr[0] + arr[1] + arr[2],
06 );
Which two assert statements are valid tests for the function?
Choose 2 answers

A. console.assert(sum3(1, '2')) == 12);
B. console.assert(sum3(0)) == 0);
C. console.assert(sum3(-3, 2 )) == -1);
D. console.assert(sum3('hello', 2, 3, 4)) === NaN);

Answer: A,C

NEW QUESTION # 135
Given the HTML below:
<div>
<div id="row-uc">Universal Containers</div>
<div id="row-as">Applied Shipping</div>
<div id="row-bt">Burlington Textiles</div>
</div>
Which statement adds the priority-account CSS class to the Applied Shipping row?

A. document.querySelectorAll('#row-as').classList.add('priority-account');
B. document.getElementById('row-as').addClass('priority-account');
C. document.querySelector('#row-as').classes.push('priority-account');
D. document.querySelector('#row-as').classList.add('priority-account');

Answer: D

Explanation:
document.querySelector('#row-as') returns the single element with id row-as.
That element has a classList property with add, remove, etc.
Correct usage:
document.querySelector('#row-as').classList.add('priority-account');
Why others are wrong:
A: querySelectorAll returns a NodeList, not a single element, so it does not have a classList property.
C: DOM elements do not have a classes array or push; they have classList.
D: document.getElementById('row-as') is fine to get the element, but there is no addClass method in standard DOM; that's a jQuery-style API, not vanilla JS.

NEW QUESTION # 136
let page2stream = "The quick brown fox jumps";
Which three expressions return true for a substring?

A. sampleText.indexOf('quick' > -4);
B. sampleText.indexOf('Quick') !== -1;
C. sampleText.indexOf(fox);
D. sampleText.includes('fox');
E. sampleText.include('fox') !== -1;

Answer: A,B,D

NEW QUESTION # 137
Which statement allows a developer to update the browser navigation history without a page refresh?

A. window.history.pushState(newStateObject, '', null);
B. window.history.createState(newStateObject, '');
C. window.customHistory.pushState(newStateObject, '', null);
D. window.history.updateState(newStateObject, '');

Answer: C

NEW QUESTION # 138
......

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