JS-Dev-101 Valid Exam Guide, JS-Dev-101 Practice Test Fee

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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	Objects, Functions, and Classes: Covers function, object, and class implementations to meet business requirements, along with the use of modules, decorators, variable scope, and execution flow.
Topic 2	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.
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	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 5	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q73-Q78):

NEW QUESTION # 73
Given the code below:
01 function GameConsole (name) {
02 this.name = name;
03 }
04
05 GameConsole.prototype.load = function(gamename) {
06 console.log( ` $(this.name) is loading agame : $(gamename) ...`);
07 )
08 function Console 16 Bit (name) {
09 GameConsole.call(this, name) ;
10 }
11 Console16bit.prototype = Object.create ( GameConsole.prototype) ;
12 //insert code here
13 console.log( ` $(this.name) is loading a cartridge game :$(gamename) ...`);
14 }
15 const console16bit = new Console16bit(' SNEGeneziz ');
16 console16bit.load(' Super Nonic 3x Force ');
What should a developer insert at line 15 to output the following message using the method ?
> SNEGeneziz is loading a cartridgegame: Super Monic 3x Force . . .

A. Console16bit.prototype.load(gamename) = function() {
B. Console16bit = Object.create(GameConsole.prototype).load = function(gamename) {
C. Console16bit.prototype.load = function(gamename) {
D. Console16bit.prototype.load(gamename) {

Answer: C

NEW QUESTION # 74
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as [1,2]?
Choose 3 answer

A. let x = arr. slice (2);
B. let x =arr.splice(0, 2);
C. let x arr.filter((a) => (return a <= 2 });
D. let x = arr.filter ((a) => 2 }) ;
E. let x = arr. slice (0, 2);

Answer: B,C,E

NEW QUESTION # 75
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() {
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(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
}

Answer: D

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 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 # 76
A developer initiates a server with the file server,js and adds dependencies in the source codes package,json that are required to run the server.
Which command should the developer run to start the server locally?

A. node start
B. npm start server,js
C. npm start
D. start server,js

Answer: C

NEW QUESTION # 77
Which two code snippets show working examples of a recursive function?

A. const factorial = numVar => {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
B. let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
C. const sumToTen = numVar => {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
};
D. function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}

Answer: A,B

Explanation:
return startNumber;
}
};
(Note: Option D is shown here with corrected syntax: lowercase return and matching parentheses.) Explanation:
A recursive function is a function that calls itself and has a base case to terminate the recursion.
Evaluate each option:
Option A:
const sumToTen = numVar => {
if (numVar < 0)
return;
return sumToTen(numVar + 1);
};
This function calls itself: sumToTen(numVar + 1) - so it is recursive.
However, the base condition is if (numVar < 0) return;.
If you call sumToTen(0):
numVar < 0 is false, so it calls sumToTen(1), then sumToTen(2), and so on, incrementing forever.
There is no condition to stop the recursion when numVar increases; it will eventually cause a stack overflow.
This code does not represent a properly working recursive function with a valid termination for increasing values and is not a good example of correct recursion.
Option B:
function factorial(numVar) {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar - 1;
}
This function does not call itself anywhere.
It has conditional returns, but there is no recursive call such as factorial(numVar - 1).
Therefore, it is not recursive at all.
Option C:
const factorial = numVar => {
if (numVar < 0) return;
if (numVar === 0) return 1;
return numVar * factorial(numVar - 1);
};
This is a classic recursive factorial implementation.
It calls itself with a smaller argument: factorial(numVar - 1).
Base cases:
If numVar < 0, it simply returns (could be treated as invalid input).
If numVar === 0, it returns 1, which is the mathematical definition of 0! (zero factorial).
For positive integers, it correctly multiplies numVar by factorial(numVar - 1) until it reaches the base case.
This is a correct and working recursive function.
Option D (corrected):
let countingDown = function(startNumber) {
if (startNumber > 0) {
console.log(startNumber);
return countingDown(startNumber - 1);
} else {
return startNumber;
}
};
This function also calls itself: countingDown(startNumber - 1).
Base case:
When startNumber is not greater than 0 (i.e., 0 or negative), it returns startNumber and stops recursing.
For example, countingDown(3) would:
Log 3, call countingDown(2)
Log 2, call countingDown(1)
Log 1, call countingDown(0)
At 0, it hits the else branch and returns 0, ending the recursion.
This is a valid working recursive function structure (once syntax is corrected).
Therefore, the snippets that show working recursive functions are:
Answe r: C, D
Study Guide / Concept Reference (no links):
Definition of recursion: a function calling itself
Base case vs recursive step
Recursive factorial implementation
Recursive countdown example
Importance of a terminating condition to avoid infinite recursion

NEW QUESTION # 78
......

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