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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await
Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript
Browser and DOM Interaction	- Event handling and propagation - Browser APIs (fetch, storage, timers) - DOM manipulation and traversal
JavaScript Language Fundamentals	- ES6+ syntax and features - Functions, scope, and closures - Data types, variables, and operators

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q124-Q129):

NEW QUESTION # 124
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the browser console to execute a script that prevents the load event to be fired.
B. Use the DOM inspector to remove all the elements containing the class ad-library-item.
C. Use the browser to execute a script that removes all the element containing the class ad-library-item.
D. Use the DOM inspector to prevent the load event to be fired.

Answer: C

NEW QUESTION # 125
A developer wrote a fizzbuzz function that when passed in a number, returns the following:
* 'Fizz' if the number is divisible by 3.
* 'Buzz' if the number is divisible by 5.
* 'Fizzbuzz' if the number is divisible by both 3 and 5.
* Empty string if the number is divisible by neither 3 or 5.
Which two test cases will properly test scenarios for the fizzbuzz function?
Choose 2 answers

A. let res = fizzbuzz(15);
console.assert ( res === ' fizzbuzz ' )
B. let res = fizzbuzz(Infinity);
console.assert ( res === ' ' )
C. let res = fizzbuzz(5);
console.assert ( res === ' ' );
D. let res = fizzbuzz(3);
console.assert ( res === ' buzz ' )

Answer: A,B,D

NEW QUESTION # 126
Refer to the following object:
const dog = {
firstName: ' Beau ' ,
lastName: ' Boo ' ,
get fullName() {
return this.firstName + ' ' + this.lastName;
}
};
How can a developer access the fullName property for dog?

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

Answer: B

Explanation:
The correct answer is A .
This object uses a getter :
get fullName() {
return this.firstName + ' ' + this.lastName;
}
A getter looks like a method when it is defined, but it is accessed like a normal property.
So the correct access syntax is:
dog.fullName
That returns:
" Beau Boo "
The important distinction is:
dog.fullName
not:
dog.fullName()
Because fullName is a getter property, not a regular function property.
Option B is incorrect because calling dog.fullName() tries to call the returned string as a function. Since " Beau Boo " is not a function, that would cause a TypeError.
Option C is incorrect because there is no get object inside dog.
Option D is incorrect because there is no function object inside dog, and getters are not accessed that way.
Therefore, the verified answer is A .

NEW QUESTION # 127
Which three options show valid methods for creating a fat arrow function? Choose 3 answers

A. { } => { console.log (executed') ; )
B. ( ) => { console.log (' executed') ; )
C. X => {console.log {'executed'} ; }
D. (x, y, z) => (console.log ('executed') ;)
E. X, y, z => ( console.log ('executed') ; )

Answer: B,C,D

NEW QUESTION # 128
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. Undefined Developer
B. Error: myFather.job is not a function
C. John Developer
D. John undefined

Answer: C

NEW QUESTION # 129
......

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