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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q127-Q132):

NEW QUESTION # 127
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

A. The function uses the this from the enclosing scope.
B. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
C. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
D. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

Answer: C,D

NEW QUESTION # 128
for (let number = 2; number < = 5; number += 1) {
// faster code statement here
}
Which statement meets the requirements to log an error when the Boolean statement evaluates to false?

A. console.classy(number + 2 === 0);
B. assert(number + 2 === 0);
C. console.error(number + 2 === 0);
D. console.assert(number + 2 === 0);

Answer: D

Explanation:
* console.assert(condition, message?) logs an assertion error if condition is falsy.
* To log an error when number + 2 === 0 is false, use:
console.assert(number + 2 === 0);
Other options are invalid or do not behave as described: console.error always logs, assert alone is not a built- in browser global, and console.classy doesn't exist.

NEW QUESTION # 129
What are two unique features of functions defined with a fat arrow as compared to normal function definition?
Choose 2 answers

A. The function uses the this from the enclosing scope.
B. If the function has a single expression in the function body, the expression will be evaluated and implicit returned.
C. The function generated its own this making it useful for separating the function's scope from its enclosing scope.
D. The function receives an argument that is always in scope, called parentThis, which is the enclosing lexical scope.

Answer: B,C

NEW QUESTION # 130
Which two console logs out NaN?
Choose 2 answers

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

Answer: B,D

NEW QUESTION # 131
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !

A. value === Number.NaN
B. Object.is(value, NaN)
C. Number.isNaN(value)
D. value == NaN
E. value ! == value

Answer: C,D

NEW QUESTION # 132
......

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