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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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

NEW QUESTION # 125
Given two expressions var1 and var2, what are two valid ways to return the logical AND of the two expression and ensure it is data type Boolean? Choose 2 answers

A. Boolean (var1 && var2)
B. Var1 && var2
C. Boolean (var1) && Boolean (var2)
D. Var1. Toboolean ( ) && var2, to Boolean ( )

Answer: A,D

NEW QUESTION # 126
Refer to the code below:
Let str = 'javascript';
Str[0] = 'J';
Str[4] = 'S';
After changing the string index values, the value of str is 'javascript'. What is the reason for this value:

A. Non-primitive values are immutable.
B. Non-primitive values are mutable.
C. Primitive values are immutable.
D. Primitive values are mutable.

Answer: C

NEW QUESTION # 127
A developer is creating a simple webpage with a button. When a user clicks this button
for the first time, a message is displayed.
The developer wrote the JavaScript code below, but something is missing. The
message gets displayed every time a user clicks the button, instead of just the first time.
01 function listen(event) {
02 alert ( 'Hey! I am John Doe') ;
03 button.addEventListener ('click', listen);
Which two code lines make this code work as required?
Choose 2 answers

A. On line 04, use button.removeEventListener(' click" , listen);
B. On line 02, use event.first to test if it is the first execution.
C. On line 04, use event.stopPropagation ( ),
D. On line 06, add an option called once to button.addEventListener().

Answer: A,D

NEW QUESTION # 128
Refer the following code

what is the value of array after code executes?

A. [ 1, 2, 3, 5 ]

Answer: A

NEW QUESTION # 129
Refer to the code below:

What is the output after the ode executes successfully?

A. Start
End
Success
B. Start
Success
End
C. Success
Start
End
D. End
Start
Success

Answer: B

NEW QUESTION # 130
......

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