Exam JS-Dev-101 Format, Pass JS-Dev-101 Test Guide

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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
Real Exam Qty:	60 scored + up to 5 unscored
Available Languages:	English, Japanese
Exam Format:	Multiple choice, Multiple select
Certificate Validity Period:	Does not expire; requires maintenance updates
Related Certifications:	Salesforce Certified Developer Salesforce Certified Platform Developer I
Exam Price:	USD 200
Passing Score:	65%
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:

Topic	Details
Topic 1	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 2	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q58-Q63):

NEW QUESTION # 58
Which code statement correctly retrieves and returns an object from localStorage?

A. const retrieveFromLocalStorage = () =>{return JSON.stringify(window.localStorage.getItem(storageKey));}
B. const retrieveFromLocalStorage = (storageKey) =>{return JSON.parse(window.localStorage.getItem(storageKey));}
C. const retrieveFromLocalStorage = (storageKey) =>{return window.localStorage.getItem(storageKey);}
D. constretrieveFromLocalStorage = (storageKey) =>{return window.localStorage[storageKey];}

Answer: B

NEW QUESTION # 59
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Which code should be inserted at the line 03 to set up an event and start the web server ?

A. server()
B. console.log( 'Listening on ', port) ;
C. serve(( port) => (
D. server.on(' connect ' , ( port) => {console.log('Listening on ' , port) ;})
E. Server.start ();

Answer: D

NEW QUESTION # 60
A developer writers the code below to calculate the factorial of a given number.
Function factorial(number) {
Return number + factorial(number -1);
}
factorial(3);
What is the resultof executing line 04?

A. 0
B. RuntimeError
C. -Infinity
D. 1

Answer: B

NEW QUESTION # 61
Refer to the code:
01 let car1 = new Promise((_, reject) =>
02 setTimeout(reject, 2000, "Car 1 crashed in"));
03 let car2 = new Promise(resolve =>
04 setTimeout(resolve, 1500, "Car 2 completed"));
05 let car3 = new Promise(resolve =>
06 setTimeout(resolve, 3000, "Car 3 completed"));
07
08 Promise.race([car1, car2, car3])
09 .then(value => {
10 let result = '$(value) the race.';
11 })
12 .catch(err => {
13 console.log("Race is cancelled.", err);
14 });
What is the value of result when Promise.race executes?

A. Car 3 completed the race.
B. Race is cancelled.
C. Car 1 crashed in the race.
D. Car 2 completed the race.

Answer: D

Explanation:
Promise.race() returns the result of the first settled promise, whether resolved or rejected.
The promises:
car1 → rejects in 2000 ms
car2 → resolves in 1500 ms
car3 → resolves in 3000 ms
The earliest settled promise is car2 (1500 ms), which resolves with the value:
"Car 2 completed"
Therefore, Promise.race enters the .then() branch with:
value = "Car 2 completed"
Inside the .then():
let result = '$(value) the race.';
This appears to attempt template substitution but uses incorrect syntax.
JavaScript template literals require backticks and ${expression}, for example:
`${value} the race.`
Because the code is incorrect, result is literally the string:
$(value) the race.
However, the question asks:
"What is the value of result when Promise.race executes?"
This refers to the intended value based on which promise wins the race, not the template bug.
The winning value is:
Car 2 completed
So the correct conceptual answer is:
Car 2 completed the race.
JavaScript Knowledge Reference (text-only)
Promise.race() returns the first settled (resolved or rejected) promise.
The earliest resolve here is car2 (1500 ms).
Incorrect template literal syntax does not affect the identity of the winning promise.

NEW QUESTION # 62
Given the code below:

What is logged to the console'

A. 2 5 3 4 1
B. 2 5 1 3 4
C. 1 2 5 3 4
D. 1 2 3 4 5

Answer: A

NEW QUESTION # 63
......

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