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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q12-Q17):

NEW QUESTION # 12
Refer to the code below:

Why does the function bar have access to variable =?

A. Prototype chain
B. Outer function's scope
C. Inner function's scope
D. Hoisting

Answer: C

NEW QUESTION # 13
Refer to the code below:

When does promise. Finally on line 08 get called?

A. When resolved or rejected
B. When resolved
C. When rejected
D. When resolved and settled

Answer: A

NEW QUESTION # 14
Refer to the code below:

What is the output of this function when called with an empty array?

A. Return 0
B. Return 5
C. Return NaN
D. Return Infinity

Answer: B

NEW QUESTION # 15
Refer to the code below:

What is the value of result when the code executes?

A. 10 - 5
B. 5 - 5
C. 5 - 10
D. 10 - 10

Answer: D

NEW QUESTION # 16
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".

What can the developer do to change the code to print "Hello World" ?

A. Change line 7 to ) () ;
B. Change line 9 to sayHello(world) ();
C. Change line 5 to function world ( ) {
D. Change line 2 to console.log('Hello' , name() );

Answer: D

NEW QUESTION # 17
......

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