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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Asynchronous JavaScript	- Event loop and concurrency model - Error handling in async workflows - Promises and async/await
Topic 2: Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript
Topic 3: JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features
Topic 4: Browser and DOM Interaction	- DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers)
Topic 5: Testing and Debugging	- Debugging techniques and tools - Unit testing principles

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q11-Q16):

NEW QUESTION # 11
Considering type coercion, what does the following expression evaluate to?
true + ' 13 ' + NaN

A. ' 113NaN '
B. 0
C. ' true13 '
D. ' true13NaN '

Answer: D

Explanation:
Expression:
true + ' 13 ' + NaN
The + operator is left-associative, so evaluation order:
* true + ' 13 '
* When one operand is a string, + performs string concatenation.
* true is converted to string ' true ' .
* ' true ' + ' 13 ' # ' true13 ' .
* Result from step 1 with NaN:
' true13 ' + NaN
* Again, one operand is a string, so concatenation.
* NaN is converted to string ' NaN ' .
* ' true13 ' + ' NaN ' # ' true13NaN ' .
Final value: ' true13NaN ' .
So A is correct.
Why others are wrong:
* B: ' 113NaN ' would require true to coerce to 1 first and no string to be present, which is not the case because ' 13 ' forces string concatenation.
* C: 14 would require pure numeric addition, which is not the case once a string is involved.
* D: ' true13 ' ignores the final + NaN part.
Concepts: type coercion with +, boolean to string, NaN to string, left-associative evaluation.

NEW QUESTION # 12
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(5);
console.assert ( res === ' ' );
C. let res = fizzbuzz(3);
console.assert ( res === ' buzz ' )
D. let res = fizzbuzz(Infinity);
console.assert ( res === ' ' )

Answer: A,C,D

NEW QUESTION # 13
A developer has the following array of student test grades:
Let arr = [ 7, 8, 5, 8, 9 ];
The Teacher wants to double each score and then see an array of the students
who scored more than 15 points.
How should the developer implement the request?

A. Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
B. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));
C. Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
D. Let arr1 = arr.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))

Answer: C

NEW QUESTION # 14
Which JavaScript method can be used to serialize an object into a string and deserialize a JSON string into an object, respectively?

A. JSON.Stringify and JSON.parse
B. JSON,serialize and JSON,desrialize
C. JSON.parse and JSON deserialize
D. JSON.encode and JSON decode

Answer: B

NEW QUESTION # 15
Refer to the code:
01 const event = new CustomEvent(
02 // Missing code
03 );
04 obj.dispatchEvent(event);
A developer needs to dispatch a custom event called update to send information about recordId.
Which two options can be inserted at line 02?

A. ' update ' , { recordId: ' 123abc ' }
B. ' update ' , ' 123abc '
C. { type: ' update ' , recordId: ' 123abc ' }
D. ' update ' , { detail: { recordId: ' 123abc ' } }

Answer: A,D

Explanation:
The correct constructor signature for CustomEvent is:
new CustomEvent(eventName, optionsObject)
Where:
* eventName is a string.
* optionsObject may include:
* detail # used to pass custom data
* bubbles
* cancelable, etc.
Example:
new CustomEvent( ' update ' , {
detail: { recordId: ' 123abc ' }
});
Now evaluate each option:
Option A
{ type: ' update ' , recordId: ' 123abc ' }
Incorrect: The constructor requires (eventName, options), not a single object. type is not used this way.
Option B
' update ' , { detail: { recordId: ' 123abc ' } }
Correct format. detail is the proper place for custom event data.
Option C
' update ' , ' 123abc '
Incorrect: The second argument must be an object (options), not a string.
Option D
' update ' , { recordId: ' 123abc ' }
Acceptable because any extra properties on the options object are still allowed, even though best practice is to use detail.
This still creates a valid CustomEvent, and the event will dispatch successfully.
Thus the two correct answers are B and D .
JavaScript Knowledge References (text-only)
* new CustomEvent(name, options) is the required syntax.
* The detail property of the options object is the standard location for custom data.
* The second argument must be an object; other types are invalid.

NEW QUESTION # 16
......

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