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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Server Side JavaScript	8%	- Server-side JavaScript implementations - Package management (npm) - Node.js fundamentals - CLI commands - Core Node.js modules
Topic 2: Testing	7%	- Writing and modifying unit tests - Test effectiveness evaluation - Test coverage and reliability - Unit testing concepts
Topic 3: Variables, Types, and Collections	23%	- Arrays and collections - JSON parsing and manipulation - Truthy and falsy evaluations - Strings, numbers, and dates - Primitive and complex data types - Variable declarations and initialization - Type coercion and conversion
Topic 4: Debugging and Error Handling	7%	- Console methods for debugging - Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally)
Topic 5: Browser and Events	17%	- Event handling and listeners - Browser-specific APIs - Browser Developer Tools usage - Interacting with forms and user input - Event propagation (bubbling and capturing) - DOM manipulation
Topic 6: Asynchronous Programming	13%	- Event loop and execution flow - Promises (creation, chaining, error handling) - Callbacks - Async/Await syntax - Asynchronous patterns for business requirements
Topic 7: Objects, Functions, and Classes	25%	- Execution flow and context - Function declarations and expressions - Variable scope and closures - Higher-order functions - Modules and decorators - Prototypal inheritance - ES6 classes and inheritance - Arrow functions - Object creation and manipulation

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q75-Q80):

NEW QUESTION # 75
Refer to the code below:

Which assertion accurately tests the above code?

A. Console, assert ( await functionalUnderTest (true) , 'ok
B. Console, assert ( await functionalUnderTest (true) , 'not ok) )
C. Console, assert ( await functionalUnderTest (true) , 'not ok' )
D. Console, assert (functionalUnderTest (true) , 'ok')

Answer: D

NEW QUESTION # 76
Most accurate tests for:
const arr = Array(5).fill(0);

A. console.assert(arr[5] === 0 & & arr.length === 0);
B. console.assert(arr.length === 5);
C. console.assert(arr.length === 0);
D. arr.forEach(e = > console.assert(e === 0));

Answer: B,D

Explanation:
The correct answers are C and D .
The statement:
const arr = Array(5).fill(0);
creates an array with 5 elements , and every element is filled with the value 0.
So the array becomes:
[0, 0, 0, 0, 0]
A professional test should verify both important expectations:
arr.length === 5
and:
each element === 0
Option C is correct because it checks every element in the array:
arr.forEach(e = > console.assert(e === 0));
This confirms that each array element was filled with 0.
Option D is correct because it checks the array length:
console.assert(arr.length === 5);
This confirms that the array contains exactly five elements.
Option A is incorrect because the array length is not 0; it is 5.
Option B is incorrect for two reasons. First, arr[5] is outside the valid index range. The valid indexes are:
0, 1, 2, 3, 4
So:
arr[5]
returns:
undefined
Second, arr.length === 0 is false because the length is 5.
Therefore, the verified answers are C and D .

NEW QUESTION # 77
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.filter(( val) => ( return val > 15 )) .map (( num) => ( return num *2 ))
B. Let arr1 = arr.map((num) => num*2). Filter (( val) => val > 15);
C. Let arr1 = arr.mapBy (( num) => ( return num *2 )) .filterBy (( val ) => return val > 15 )) ;
D. Let arr1 = arr.map((num) => ( num *2)).filterBy((val) => ( val >15 ));

Answer: B

NEW QUESTION # 78
Refer to the code snippet:
Function getAvailabilityMessage(item) {
If (getAvailability(item)){
Var msg ="Username available";
}
Return msg;
}
A developer writes this code to return a message to user attempting to register a new
username. If the username is available, variable.
What is the return value of msg hen getAvailabilityMessage ("newUserName" ) is
executed and getAvailability("newUserName") returns false?

A. undefined
B. "Username available"
C. "Msg is not defined"
D. "newUserName"

Answer: A

NEW QUESTION # 79
Refer to the following code:

What is the output of line 11?

A. ["foo:1", "bar:2"]
B. ["bar", "foo"]
C. ["foo", "bar"]
D. [1,2]

Answer: C

NEW QUESTION # 80
......

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