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The Salesforce JS-Dev-101 Certification is a valuable certificate that is designed to advance the professional career. With the Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification exam seasonal professionals and beginners get an opportunity to demonstrate their expertise. The Salesforce Certified JavaScript Developer - Multiple Choice certification exam recognizes successful candidates in the market and provides solid proof of their expertise.

Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 2	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
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.
Topic 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
Topic 5	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q139-Q144):

NEW QUESTION # 139
A developer at Universal Containers is creating their 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 when the webpage is fully loaded (HTML content and all related files), in order to do some custom initializations.
Which implementation should be used to call Fe:s:-a;::eHec5;te::.-.ter.: based on the business requirement above?

A. Add a handler to the personalizeWebsiteContent script tohandle the DOMContentLoaded event
B. Add a handler to the personalizeWebsiteContent script to handle the load event
C. Add a listener to thewindow object to handle the DOMContentLoaded event
D. Add a listener to the window object to handle the lead event

Answer: D

NEW QUESTION # 140
Refer to the code:
01 console.log('Start');
02 Promise.resolve('Success').then(function(value) {
03 console.log('Success');
04 });
05 console.log('End');
What is the output after the code executes successfully?

A. Start
Success
End
B. Start
End
Success
C. End
Start
Success
D. Success
Start
End

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge console.log('Start') runs immediately (synchronous).
Promise.resolve().then(...) places the callback in the microtask queue. The .then handler does not run immediately.
console.log('End') runs next (still synchronous).
After the synchronous script finishes, the microtask queue runs, logging "Success".
Execution order:
Start
End
Success
This matches option B.
________________________________________
JavaScript Knowledge Reference (text-only)
Promise .then() callbacks execute after the current call stack finishes (microtask queue).
Synchronous logs run immediately, before promise callbacks.

NEW QUESTION # 141
Which two console logs outputs NaN ?
Choose 2 answers

A. console.log(10/ Number('5'));
B. console.log(10/0);
C. console.log(10/ ''five);
D. console.log(parseInt('two'));

Answer: C,D

NEW QUESTION # 142
Refer to the code below:
01 new Promise((resolve, reject) => {
02 const fraction = Math.random();
03 if (fraction > 0.5) reject('fraction > 0.5, ' + fraction);
04 resolve(fraction);
05 })
06 .then(() => console.log('resolved'))
07 .catch((error) => console.error(error))
08 .finally(() => console.log('when am I called?'));
When does Promise.finally on line 08 get called?

A. When resolved
B. When resolved or rejected
C. When resolved and settled
D. When rejected

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract JavaScript knowledge:
Behavior of Promise.prototype.finally:
.finally(handler) registers a callback that runs when the promise is settled, meaning:
Either fulfilled (resolved), or
rejected.
Important points:
The finally callback does not receive the promise's value or error (unlike then and catch).
It is executed after the promise is settled, but before the resolution value or rejection reason is passed further down the chain.
It runs in both success and failure paths.
In the given code:
The promise may either:
Call reject('fraction > 0.5, ' + fraction) if fraction > 0.5, or
Call resolve(fraction) otherwise.
In both cases:
If it resolves, .then(() => console.log('resolved')) runs, and then .finally(...) is executed.
If it rejects, .catch((error) => console.error(error)) runs, and then .finally(...) is executed.
So .finally runs:
Not just "when rejected".
Not just "when resolved".
But whenever the promise is resolved or rejected.
Therefore, the correct choice is:
D . When resolved or rejected.

NEW QUESTION # 143
Given the code below:
let numValue = 1982;
Which three code segments result in a correct conversion from number to string?

A. let strValue = String(numValue);
B. let strValue = '' + numValue;
C. let strValue = (String)numValue;
D. let strValue = numValue.toText();
E. let strValue = numValue.toString();

Answer: A,B,E

Explanation:
This is not valid JavaScript casting syntax; it is more like a C/Java-style cast.
In JavaScript, that is parsed as a grouping expression (String) and then numValue; it does not convert numValue to a string.
Thus the correct answers are:
B . String(numValue);
C . '' + numValue;
D . numValue.toString();
Relevant concepts: primitive type conversion, String() casting, .toString(), coercion via + with strings.
Explanation:
We want to convert the number 1982 to a string.
Check each option:
A . numValue.toText()
There is no standard toText() method on numbers.
This will result in TypeError: numValue.toText is not a function.
B . String(numValue);
String() as a function converts its argument to a string.
String(1982) returns "1982".
This is correct.
C . '' + numValue;
'' is a string; + with a string operand performs string concatenation.
'' + 1982 → "1982".
This is a common shorthand for number-to-string conversion.
D . numValue.toString();
Number.prototype.toString() converts the number to its string representation.
1982..toString() or (1982).toString() returns "1982".
For the variable, numValue.toString() is valid: "1982".

NEW QUESTION # 144
......

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