Salesforce JavaScript-Developer-I Latest Exam Review, JavaScript-Developer-I Clearer Explanation

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The Salesforce JavaScript-Developer-I exam consists of 60 multiple-choice questions that are designed to test your knowledge of JavaScript concepts, as well as your ability to apply those concepts in a Salesforce environment. JavaScript-Developer-I Exam is timed and you will have 105 minutes to complete it. To pass the exam, you will need to score at least 68% or higher.

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Salesforce JavaScript-Developer-I exam measures the developer's knowledge of the Salesforce platform, including its capabilities and limitations. It assesses their ability to design, develop, test, and deploy custom applications on the Salesforce platform using JavaScript. JavaScript-Developer-I Exam also includes questions related to various Salesforce tools, such as Apex, Visualforce, and Lightning Web Components.

Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q127-Q132):

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 {
constructor(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 {
vehicle(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: B

Explanation:
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 References (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
A developer wants to leverage a module to print a price in pretty format, and has imported a method as shown below:
Import printPrice from '/path/PricePrettyPrint.js';
Based on the code, what must be true about the printPrice function of the PricePrettyPrint module for this import to work ?

A. printPrice must be be a named export
B. printPrice must be an all export
C. printPrice must be the default export
D. printPrice must be a multi exportc

Answer: C

NEW QUESTION # 129
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the result after line 10 executes?

A. John undefined
B. Undefined Developer
C. Error: myFather.job is not a function
D. John Developer

Answer: C

NEW QUESTION # 130
A class was written to represent regular items and sale items. Code:
01 let regItem = new Item( ' Scarf ' , 55);
02 let saleItem = new SaleItem( ' Shirt ' , 80, .1);
03 Item.prototype.description = function() { return ' This is a ' + this.name; }
04 console.log(regItem.description());
05 console.log(saleItem.description());
06
07 SaleItem.prototype.description = function() { return ' This is a discounted ' + this.name; }
08 console.log(regItem.description());
09 console.log(saleItem.description());
What is the output?

A. This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
B. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Shirt
This is a discounted Shirt
C. This is a Scarf
Uncaught TypeError: saleItem.description is not a function
This is a Scarf
This is a discounted Shirt
D. This is a Scarf
This is a Shirt
This is a discounted Scarf
This is a discounted Shirt

Answer: A

Explanation:
* At line 03, the developer assigns:
Item.prototype.description = function() { return ' This is a ' + this.name; } This affects all objects whose prototype chain includes Item.prototype .
* regItem inherits from Item # gets this method.
* saleItem, as an instance of SaleItem, also inherits Item.prototype (since SaleItem uses prototype inheritance from Item), so it also has this method at this moment.
Outputs at lines 04 and 05:
* regItem.description() # " This is a Scarf "
* saleItem.description() # " This is a Shirt "
* At line 07, the developer overrides the method on SaleItem.prototype :
SaleItem.prototype.description = function() {
return ' This is a discounted ' + this.name;
}
From this point:
* regItem still uses the Item.prototype version
* saleItem uses the overridden SaleItem.prototype version
Outputs at lines 08 and 09:
* regItem.description() # " This is a Scarf "
* saleItem.description() # " This is a discounted Shirt "
Combining all results:
This is a Scarf
This is a Shirt
This is a Scarf
This is a discounted Shirt
This matches option B .
JavaScript Knowledge References (text-only)
* Objects created from constructor functions use prototype chaining.
* Overriding a subclass prototype method does not affect the parent class prototype.
* Instances inherit the most specific version of the method on their prototype chain.

NEW QUESTION # 131
Refer to the code below:
console.log(''start);
Promise.resolve('Success') .then(function(value){
console.log('Success');
});
console.log('End');
What is the output after the code executes successfully?

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

Answer: C

NEW QUESTION # 132
......

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Salesforce JavaScript-Developer-I Latest Exam Review, JavaScript-Developer-I Clearer Explanation

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q127-Q132):

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