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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q135-Q140):

NEW QUESTION # 135
Given the code below:
Which three code segments result in a correct conversion from number to string? Choose 3 answers

A. let strValue = numValue. toString();
B. let strValue = numValue.toText ();
C. let strValue = * * 4 numValue;
D. let scrValue = String(numValue);
E. let strValue = (String)numValue;

Answer: A,C,D

NEW QUESTION # 136
A developer wants to define a function log to be used a few times on a single-file JavaScript script.
01 // Line 1 replacement
02 console.log('"LOG:', logInput);
03 }
Which two options can correctly replace line 01 and declare the function for use?
Choose 2 answers

A. const log = (logInput) => {
B. function leg(logInput) {
C. function log = (logInput) {
D. const log(loginInput) {

Answer: A,B

NEW QUESTION # 137
Which two console logs out NaN?
Choose 2 answers

A. Console.log(parseint ('two') ) ;
B. Console.log(10 / Number ('5) );
C. Console.log(10 / 'five' ') ;
D. Console.log (10 / 0);

Answer: A,C

NEW QUESTION # 138
A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the function to run once after five seconds.
What is the correct syntax to schedule this function?

A. setTimeout ('formatName', 5000, 'John", "Doe');
B. setTimout(() => { formatName("John', 'Doe') }, 5000);
C. setTimeout (formatName(), 5000, "John", "BDoe");
D. setTimeout (formatName('John', ''Doe'), 5000);

Answer: A

NEW QUESTION # 139
Refer to the code below:

What are the values for first and second once the executes?

A. First is who and second is where.
B. First is why and second is when.
C. First is who and second is when.
D. First is why and second is where.

Answer: D

NEW QUESTION # 140
......

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