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| Section | Objectives |
|---|---|
| Topic 1: JavaScript Fundamentals | - Functions and Scope - Control Flow and Error Handling - Variables, Data Types, and Operators |
| Topic 2: Object-Oriented JavaScript | - Classes and Inheritance - Objects and Prototypes |
| Topic 3: Browser and DOM Interaction | - DOM Manipulation - Events and Event Handling |
| Topic 4: Asynchronous Programming | - API Calls and Data Fetching - Callbacks, Promises, and Async/Await |
| Topic 5: Salesforce Platform Integration | - Working with Salesforce Data Models - Lightning Web Components (LWC) Basics |
>> JS-Dev-101 Reliable Learning Materials <<
This is a Salesforce JS-Dev-101 practice exam software for Windows computers. This JS-Dev-101 practice test will be similar to the actual Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) exam. If user wish to test the Salesforce JS-Dev-101 study material before joining TrainingDump, they may do so with a free sample trial. This JS-Dev-101 Exam simulation software can be readily installed on Windows-based computers and laptops. Since it is desktop-based Salesforce JS-Dev-101 practice exam software, it is not necessary to connect to the internet to use it.
NEW QUESTION # 135
A developer creates a genericfunction to log custom messages in the console. To do this, the function below is implemented.
01 function logStatus(status){
02 console./*Answer goes here*/{'Item status is: %s', status};
03 }
Which three console logging methods allow the use of string substitution in line 02?
Answer: A,C,D
NEW QUESTION # 136
Given the following code:
What will be the first four numbers logged?
Answer: D
NEW QUESTION # 137
Given a value, which three options can a developer use to detect if the value is NaN?
Answer: A,B,D
Explanation:
In JavaScript, NaN has some special properties:
NaN is not equal to anything, including itself.
Equality operators (==, ===) do not work for detecting NaN.
Check each option:
A . value === Number.NaN
Number.NaN is just NaN.
But NaN === NaN is always false.
So this expression is never true and cannot be used to detect NaN.
B . value == NaN
Same issue. NaN == NaN is always false.
So this also never detects NaN.
C . Object.is(value, NaN)
Object.is is a more precise equality comparison method.
It treats NaN as equal to NaN: Object.is(NaN, NaN) is true.
So Object.is(value, NaN) is a valid way to detect NaN.
D . value !== value
Because NaN is the only JavaScript value that is not equal to itself,
value !== value is true only when value is NaN.
This is a classic trick for NaN detection.
E . Number.isNaN(value)
Number.isNaN is the recommended modern way to check if a value is NaN without coercion.
It returns true only if value is actually the number NaN.
Therefore, the three correct ways are:
Object.is(value, NaN)
value !== value
Number.isNaN(value)
NEW QUESTION # 138
let sampleText = "The quick brown fox jumps";
Which three expressions return true for a substring?
Answer: B,D,E
Explanation:
The correct answers are A, B, and C.
The original variable name appears to contain a typing error. The variable should be used consistently as sampleText:
let sampleText = "The quick brown fox jumps";
A is correct because includes() checks whether a string contains a specific substring and returns a Boolean value:
sampleText.includes('fox');
Since "fox" exists inside "The quick brown fox jumps", this returns:
true
B is correct after correcting the typing error. The correct expression is:
sampleText.indexOf('quick') > -1;
indexOf() returns the index position where the substring is found. If the substring is not found, it returns -1.
Since "quick" exists in the string, sampleText.indexOf('quick') returns a value greater than -1, so the expression returns:
true
C is correct after correcting the missing quotation marks and adding a Boolean comparison:
sampleText.indexOf('fox') !== -1;
The substring "fox" exists in the string, so indexOf('fox') does not return -1. Therefore, the expression returns:
true
D is incorrect because the method name is typed incorrectly. JavaScript string has includes(), not include().
Incorrect:
sampleText.include('fox')
Correct:
sampleText.includes('fox')
E is incorrect because JavaScript string matching is case-sensitive:
sampleText.indexOf('Quick') !== -1;
The string contains "quick" with a lowercase q, not "Quick" with an uppercase Q, so this returns:
false
Therefore, the verified answers are A, B, and C.
NEW QUESTION # 139
There is a new requirement for a developer to implement a currPrice method that will return the current price of the item or sales..
What is the output when executing the code above
Answer: B
NEW QUESTION # 140
......
The Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification is one of the hottest career advancement credentials in the modern Salesforce world. The Salesforce Certified JavaScript Developer - Multiple Choice (JS-Dev-101) certification can help you to demonstrate your expertise and knowledge level. With only one badge of Salesforce Certified JavaScript Developer - Multiple Choice in JS-Dev-101 Certification, successful candidates can advance their careers and increase their earning potential.
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