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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q133-Q138):

NEW QUESTION # 133
A developer uses a parsed JSON string to work with user information as in the block below:
01 const userInformation = {
02 " id " : " user-01 " ,
03 " email " : " user01@universalcontainers.demo " ,
04 " age " : 25
05 };
Which two options access the email attribute in the object?

A. userInformation[ " email " ]
B. userInformation[email]
C. userInformation.email
D. userInformation.get( " email " )

Answer: A,C

Explanation:
userInformation is a plain JavaScript object:
{
id: " user-01 " ,
email: " user01@universalcontainers.demo " ,
age: 25
}
You can access object properties in two standard ways:
* Dot notation : object.propertyName
* Bracket notation : object[ ' propertyName ' ]
Apply to each option:
* A. userInformation.email
* Correct dot notation; accesses " user01@universalcontainers.demo " .
* B. userInformation.get( " email " )
* .get() is a method on Map instances, not on plain objects.
* A regular object does not have a .get method; this would be TypeError.
* C. userInformation[ " email " ]
* Correct bracket notation; string " email " is used as the property key.
* Returns " user01@universalcontainers.demo " .
* D. userInformation[email]
* Here email is treated as a variable, not a string literal.
* Unless there is a variable named email defined with a value matching a property key, this will either:
* Throw a ReferenceError (if email is not defined), or
* Use the value of email as a computed key (not what is intended here).
* It is not the correct way to access the " email " property literal.
Therefore, the correct ways are:
The answer: A, C
Relevant concepts: object property access (. vs []), plain objects vs Map, literal property names vs computed property names.

NEW QUESTION # 134
A test searches for:
< button class= " blue " > Checkout < /button >
But the actual HTML is:
< button > Checkout < /button >
The test fails because it expects a class that no longer exists.
What type of test outcome is this?

A. False positive
B. False negative
C. True positive
D. True negative

Answer: B

Explanation:
Definitions:
* False negative # The test reports a failure even though the feature actually works.
* False positive # The test reports success when it should not.
* True positive # Correctly identifies something is working.
* True negative # Correctly identifies something is not working.
In this scenario:
* The checkout button does exist , so the feature works.
* The test fails incorrectly , because it is checking for the wrong selector.
That is the definition of a false negative .
JavaScript Knowledge References (text-only)
* Test outcome classification: false negative = feature works but test fails.

NEW QUESTION # 135
Refer to the code below:
Let inArray =[ [ 1, 2 ] , [ 3, 4, 5 ] ];
Which two statements result in the array [1, 2, 3, 4, 5] ?
Choose 2 answers

A. [ ]. concat.apply(inArray, [ ]);
B. [ ]. Concat.apply ([ ], inArray);
C. [ ]. concat ( [ ....inArray ] );
D. [ ]. Concat (... inArray);

Answer: B,D

NEW QUESTION # 136
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion passes.
B. The line 05 assertion fails.
C. Theline 02 assertion fails.
D. The line 02 assertion passes.

Answer: B,D

NEW QUESTION # 137
A developer wants to create an object from a function in the browser using the code
below:
Function Monster() { this.name = 'hello' };
Const z = Monster();
What happens due to lack of the new keyword on line 02?

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

Answer: A

NEW QUESTION # 138
......

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