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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q80-Q85):

NEW QUESTION # 80
developer publishes a new version of a package with new features that do not break backward compatibility. The previous version number was 1.1.3.
Following semantic versioning format, what should the new package version number be?

A. 1.2.0
B. 1.1.4
C. 2.0.0
D. 1.2.3

Answer: A

NEW QUESTION # 81
Teams at Universal Containers (UC) work on multiple JavaScript projects at the same time.
UC is thinking about reusability and how each team can benefit from the work of others.
Going open-source or public is not an option at this time.
Which option is available to UC with npm?

A. Private registries are not supported by npm, but packages can be installed via git.
B. Private registries are not supported by npm, but packages can be installed via URL.
C. Private packages are not supported, but they can use another package manager like
yarn.
D. Private packages can be scored, and scopes can be associated to a private
registries.

Answer: D

NEW QUESTION # 82
Code:
01 const sayHello = (name) = > {
02 console.log( ' Hello ' , name);
03 };
04
05 const world = () = > {
06 return ' World ' ;
07 };
08
09 sayHello(world);
This does not print " Hello World " .
What change is needed?

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

Answer: B

Explanation:
Currently:
* sayHello expects a value name and prints it.
* world is a function that returns ' World ' .
* sayHello(world); passes the function object itself, not the result of calling it.
So name inside sayHello is a function, not the string " World " .
To keep the call sayHello(world) yet get " World " , sayHello must call the function parameter:
const sayHello = (name) = > {
console.log( ' Hello ' , name());
};
Now:
* sayHello(world) passes the function.
* Inside sayHello, name() calls world(), which returns " World " .
* The console logs " Hello World " .
Why the others are wrong:
* B: Changing line 7 to }(); would attempt to IIFE the function definition and break the declaration.
* C: sayHello(world)() would try to call the return value of sayHello, which is undefined, causing an error.
* D: Changing world to a function declaration does not change the fact that it is passed as a function reference; sayHello still prints the function object, not ' World ' .

NEW QUESTION # 83
Refer to the following array:
Let arr = [1, 2, 3, 4, 5];
Which three options result in x evaluating as (3, 4, 5)?
Choose 3 answers

A. Let x = arr.filter( (a) => )return a > 2 )) ;
B. Let x = arr.alice (2) ;
C. Let x = arr.aplice (2, 3);
D. Let x = arr.filter( (a) => ( a < 2)) ;
E. Let x = arr. Slince (2, 3);

Answer: A,B,C

NEW QUESTION # 84
A developer wants to use a try...catch statement to catch any error that countSheep () may throw and pass it to a handleError () function.
What is the correct implementation of the try...catch?
A)

B)

C)

D)

A. Option
B. Option
C. Option
D. Option

Answer: D

NEW QUESTION # 85
......

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