Salesforce JS-Dev-101 Valid Test Labs - Latest Test JS-Dev-101 Simulations

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Salesforce JS-Dev-101 Exam Overview:

Certification Vendor:	Salesforce
Exam Name:	Salesforce Certified JavaScript Developer I - Multiple Choice Exam (JS-Dev-101)
Exam Number:	JS-Dev-101
Available Languages:	English
Exam Format:	Multiple Select Questions, Multiple Choice Questions
Passing Score:	65%
Exam Price:	$200 USD
Related Certifications:	Salesforce Platform Developer II Salesforce Platform Developer I
Real Exam Qty:	60 (multiple choice)
Certificate Validity Period:	1 year (maintenance required annually in Salesforce certification program)
Exam Duration:	105 minutes
Recommended Training:	MDN Web Docs - JavaScript Guide Salesforce Trailhead - JavaScript Developer I
Exam Registration:	Salesforce Certification Registration Kryterion Webassessor (Exam Delivery)
Sample Questions:	Salesforce JS-Dev-101 Sample Questions
Exam Way:	Online proctored exam via Salesforce authorized testing platform (e.g., Webassessor)
Pre Condition:	No formal prerequisites, but familiarity with JavaScript and web development is recommended.
Official Syllabus URL:	https://trailhead.salesforce.com/credentials/javascriptdeveloper

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JS-Dev-101 Actual Collection: Salesforce Certified JavaScript Developer - Multiple Choice - JS-Dev-101 Quiz Braindumps & JS-Dev-101 Exam Guide

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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	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 3	Server Side JavaScript: Covers Node.js implementations, CLI commands, core modules, and package management solutions for given scenarios.
Topic 4	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 5	Asynchronous Programming: Covers asynchronous programming concepts and understanding how the event loop controls execution flow and determines outcomes.
Topic 6	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 (Q123-Q128):

NEW QUESTION # 123
Refer to the code below:
let car1 = new Promise((_ ,reject)=> setTimeout(reject,2000,"Car1 crashed in")); let car2 = new Promise(resolve => setTimeout(resolve,1500,"Car2 completed")); let car3 = new Promise(resolve => setTimeout(resolve,3000,"Car3 completed")); Promise.race([car1,car2,car3])
.then(value=>{
let result = `${value} the race.`;
}).catch(err=>{
console.log('Race is cancelled.',err);
});
What is the valueof result when promise.race execues?

Answer:

Explanation:
Car2 completed the race.

NEW QUESTION # 124
Refer to the code below (assuming Promise.race is intended):
let cat3 = new Promise(resolve =>
setTimeout(resolve, 3000, "Cat 3 completes")
);
Promise.race([cat1, cat2, cat3])
.then(value => {
let result = `${value} the race.`;
})
.catch(err => {
console.log("Race is cancelled:", err);
});
(Assuming cat1 and cat2 are similar to earlier examples: cat2 resolves fastest.) What is the value of result when Promise.race executes?

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

Answer: B

Explanation:
From earlier pattern (cars/cats race):
One promise resolves the fastest with "Car 2 completed" (or analogous "Cat 2 completes").
Promise.race resolves with the first settled promise's value.
In .then, value is "Car 2 completed" and:
let result = `${value} the race.`;
// "Car 2 completed the race."
Thus result is "Car 2 completed the race." → option A.
________________________________________

NEW QUESTION # 125
Refer to the code below:

What is the result when the Promise in the execute function is rejected?

A. Rejected Resolved
B. Resolved1 Resolved2 Resolved3Resolved4
C. Rejected1 Rejected2 Rejected3 Rejected Rejected Rejected4
D. Rejected

Answer: A

NEW QUESTION # 126
Refer to the code below:
Async funct on functionUnderTest(isOK) {
If (isOK) return 'OK';
Throw new Error('not OK');
)
Which assertion accurately tests the above code?

A. Console.assert (await functionUnderTest(true), 'OK')
B. Console.assert (await functionUnderTest(true), ' OK ')
C. Console.assert (await functionUnderTest(true), ' notOK ')
D. Console.assert (await functionUnderTest(true), ' not OK ')

Answer: A

NEW QUESTION # 127
Original constructor function:
01 function Vehicle(name, price) {
02 this.name = name;
03 this.price = price;
04 }
05 Vehicle.prototype.priceInfo = function () {
06 return `Cost of the $(this.name) is $(this.price)$`;
07 }
08 var ford = new Vehicle('Ford Fiesta', '20,000');
Which class definition is correct?

A. class Vehicle {
vehicle(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return 'Cost of the ${this.name} is ${this.price}$';
}
}
B. class Vehicle {
constructor(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return 'Cost of the ${this.name} is ${this.price}$';
}
}
C. class Vehicle {
constructor(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
}
D. class Vehicle {
constructor() {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
}

Answer: C

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge A correct conversion from constructor-function syntax to ES6 class syntax must satisfy:
Use a constructor(name, price) method.
Assign instance properties inside the constructor.
Define methods without function keyword directly in the class body.
Use proper JavaScript template literals (backticks).
Evaluate each option:
________________________________________
Option A
Incorrect template literal syntax: uses single quotes with ${} which will not interpolate.
________________________________________
Option B
Incorrect:
The method vehicle() is not recognized as a constructor.
The constructor method is missing.
________________________________________
Option C
Incorrect:
The constructor has no parameters, but uses name and price which are undefined.
________________________________________
Option D
Correct:
Uses proper constructor with parameters.
Correct assignment of instance properties.
Correct template literal using backticks.
This is the valid ES6 class translation.
________________________________________
JavaScript Knowledge Reference (text-only)
ES6 classes require a constructor method for initialization.
Template literals must use backticks.
Methods inside classes are defined without the function keyword.
Omitted constructor parameters lead to undefined instance fields.

NEW QUESTION # 128
......

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