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Salesforce JS-Dev-101 Exam Syllabus Topics:

Topic	Details
Topic 1	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 2	Debugging and Error Handling: Covers proper error handling techniques and the use of the console and breakpoints to debug code.
Topic 3	Browser and Events: Covers DOM manipulation, event handling and propagation, browser-specific APIs, and using Browser Developer Tools to inspect code behavior.
Topic 4	Testing: Covers evaluating unit test effectiveness against a block of code and modifying tests to improve their coverage and reliability.

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q19-Q24):

NEW QUESTION # 19
Refer to the following object:
const cat ={
firstName: 'Fancy',
lastName: ' Whiskers',
Get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for cat?

A. cat.fullName
B. cat.get.fullName
C. cat.function.fullName()
D. cat.fullName()

Answer: A

NEW QUESTION # 20
A developer copied a JavaScript object:

How does the developer access dan's forstName,lastName? Choose 2 answers

A. dan, firstName =dan.lastName
B. dan,name ( )
C. dan,name
D. dan,firstname ( ) + dan, lastName ( )

Answer: A,B

NEW QUESTION # 21
Refer to the code:

Given the code above, which three properties are set pet1? Choose 3 answers:

A. Name
B. canTalk
C. Size
D. Type
E. Owner

Answer: B,C,D

NEW QUESTION # 22
Given two expressions, exp1 and exp2, which two valid ways return the logical AND of the two expressions and ensure it is a Boolean?

A. Boolean(var1) && Boolean(var2)
B. Boolean(exp1) && Boolean(exp2)
C. Boolean(exp1 && exp2)
D. exp1 & exp2

Answer: B,C

Explanation:
The correct answers are A and B.
The original question contains a typing error where 66 should be corrected to the logical AND operator:
&&
A is correct because it first evaluates the logical AND expression and then converts the final result to a Boolean:
Boolean(exp1 && exp2)
The && operator returns the first falsy value or the last truthy value. Wrapping the result in Boolean() ensures the final result is strictly either:
true
or:
false
Example:
Boolean("hello" && 123);
This returns:
true
B is also correct because it converts both expressions to Boolean values first, then applies logical AND:
Boolean(exp1) && Boolean(exp2)
This guarantees that both sides of the && operation are Boolean values.
Example:
Boolean("hello") && Boolean(123);
This returns:
true
C is incorrect because it uses the bitwise AND operator:
&
This is not the same as logical AND:
&&
Bitwise AND converts values into numbers and compares their binary representation. It does not reliably return a Boolean logical result.
D is incorrect as written because the question gives the expressions as exp1 and exp2, but option D uses var1 and var2. After correction, it would be the same idea as option B.
Therefore, the verified answers are A and B.

NEW QUESTION # 23
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 {
constructor() {
this.name = name;
this.price = price;
}
priceInfo() {
return `Cost of the ${this.name} is ${this.price}$`;
}
}
D. class Vehicle {
vehicle(name, price) {
this.name = name;
this.price = price;
}
priceInfo() {
return 'Cost of the ${this.name} is ${this.price}$';
}
}

Answer: B

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 # 24
......

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