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Salesforce JS-Dev-101 Exam Syllabus Topics:

SectionObjectives
Salesforce Platform Integration- Lightning Web Components (LWC) Basics
- Working with Salesforce Data Models
Object-Oriented JavaScript- Classes and Inheritance
- Objects and Prototypes
Asynchronous Programming- Callbacks, Promises, and Async/Await
- API Calls and Data Fetching
Browser and DOM Interaction- DOM Manipulation
- Events and Event Handling
JavaScript Fundamentals- Control Flow and Error Handling
- Functions and Scope
- Variables, Data Types, and Operators

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Salesforce Certified JavaScript Developer - Multiple Choice Sample Questions (Q89-Q94):

NEW QUESTION # 89
Given a value, which two options can a developer use to detect if the value is NaN?

Answer: A,B

Explanation:
We already know NaN is special: it is not equal to itself.
Check each:
A . value === Number.NaN
Number.NaN is NaN.
NaN === NaN is always false.
This will never be true; cannot reliably detect NaN.
B . value == NaN
NaN == NaN is also always false.
Again, this never detects NaN.
C . isNaN(value)
Global isNaN converts its argument to a number and then checks if the result is NaN.
This can detect NaN, but it may also return true for non-number values that coerce to NaN, such as isNaN('foo').
Regardless, it is a standard way to detect if a value is "NaN-like" in JavaScript.
D . Object.is(value, NaN)
Object.is(NaN, NaN) returns true.
This is a strict way to detect a value that is exactly NaN (no coercion).
Therefore, among the given choices, the two viable ways to detect NaN are:
isNaN(value)
Object.is(value, NaN)


NEW QUESTION # 90
Refer to the string below.
Const str='Salesforce';
Which two statementsresults in the word 'Sales'?

Answer:

Explanation:
See the Answer below in explanation


NEW QUESTION # 91
Given the code below:
const copy = JSON.stringify([ newString(' false '), new Bollean( false ), undefined ]); What is the value of copy?

Answer: B


NEW QUESTION # 92
A developer wants to use a module called DataPrettyPrint. This module exports one default functioncalled printDate ().
How can a developer import and use the printDate() function?

Answer: D


NEW QUESTION # 93
Given the following code:
let x = ('15' + 10) * 2;
What is the value of x?

Answer: B

Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge String + Number results in String concatenation When JavaScript evaluates:
'15' + 10
the + operator sees a string on the left ('15') and a number on the right (10).
In JavaScript, when one operand is a string, the + operator performs string concatenation.
Thus:
'15' + 10 → '1510'
After concatenation, multiplication forces numeric conversion
The expression becomes:
'1510' * 2
The * operator always expects numeric operands.
When given a string, JavaScript attempts numeric conversion using the internal ToNumber operation.
'1510' becomes:
1510
Then:
1510 * 2 = 3020
But 3020 is not in the answer choices-however note the answers represent:
A . 1520
B . 50
C . 35
D . 3020
The correct numeric calculation yields 3020, which matches option D.
But wait-did we misread?
Let's double-check:
('15' + 10) * 2
= '1510' * 2
= 3020
Correct value is 3020.
Therefore the right answer is D.
________________________________________
JavaScript Knowledge Reference (text-only)
The + operator concatenates if either operand is a string.
The * operator always performs numeric coercion.
'numberString' * number converts the string to a number before multiplication.


NEW QUESTION # 94
......

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