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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q125-Q130):

NEW QUESTION # 125
Which statement parses successfully?

A. JSON.parse ('' 'foo'' ');
B. JSON.parse (''foo '');
C. JSON.parse ('' 'foo' '');
D. JSON.parse ('foo ');

Answer: B

NEW QUESTION # 126
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 ' , { detail: { recordId: ' 123abc ' } }
B. ' update ' , { recordId: ' 123abc ' }
C. ' update ' , ' 123abc '
D. { type: ' update ' , recordId: ' 123abc ' }

Answer: A,B

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 # 127
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,C

NEW QUESTION # 128
A developer wants to create an object from a function in the browser using the code below.

What happens due to the lack of the mm keyword on line 02?

A. The m variable is assigned the correct object.
B. The m variable is assigned the correct object but this.name remains undefined.
C. window.name is assigned to 'hello' and the variable = remains undefined.
D. window.m Is assigned the correct object.

Answer: C

NEW QUESTION # 129
A developer has code that calculates a restaurant bill, but generates incorrect answers while testing the code:
function calculateBill (items ){
let total = 0;
total += findSubTotal(items);
total += addTax(total);
total += addTip(total);
return total;
}
Which option allows the developer to step into each function execution within calculateBill?

A. Usingthe debugger command on line 03
B. Using the debugger command on line 05.
C. Wrapping findSubtotal in a console.log() method.
D. Calling the console.trace (total) method on line 03.

Answer: B

NEW QUESTION # 130
......

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