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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Variables, Types, and Collections	23%	- Type coercion and conversion rules - Truthy and falsy values - Array methods and data manipulation - JSON parsing and usage - Variable declaration and initialization - Working with strings, numbers, dates, and booleans
Browsers and Events	17%	- Document Object Model (DOM) manipulation - Event handling, propagation, and delegation - Browser APIs and Web Storage - Window and document object properties - Script loading and execution order
Server-Side JavaScript	8%	- Core Node.js modules - Command-line tools and scripts - Module system and require/import - Node.js fundamentals and runtime
Testing	7%	- Testing frameworks and assertions - Test doubles and mocks - Unit testing concepts - Code coverage and best practices
Debugging and Error Handling	7%	- Console methods and logging - Debugging tools and breakpoints - Defensive programming practices - Error types and exception handling
Asynchronous Programming	13%	- Fetch API and HTTP requests - Event loop and micro/macro tasks - Callbacks and callback hell - Async/await syntax - Promises and chaining
Objects, Functions, and Classes	25%	- Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Object creation, properties, and methods - Modules and imports/exports - Decorators and advanced function patterns - Closures and execution context

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q37-Q42):

NEW QUESTION # 37
A page loads 50+ < div class= " ad-library-item " > elements, all ads.
Developer wants to quickly and temporarily remove them.
Options:

A. Use the DOM inspector to remove all elements containing the class ad-library-item.
B. Use the browser console to execute a script that prevents the load event from firing.
C. Use the DOM inspector to prevent the load event from firing.
D. Use the browser console to execute a script that removes all elements containing the class ad-library- item.

Answer: D

Explanation:
The goal:
" Temporarily and quickly remove them. "
The fastest way is to run a script in the browser console that removes all such elements:
document.querySelectorAll( ' .ad-library-item ' ).forEach(el = > el.remove()); This immediately removes all 50+ elements and requires no page reload.
Option analysis:
* A & B : Preventing load events is unreliable and does not remove already-created DOM nodes.
* C : Correct-console code can remove all matching DOM elements instantly.
* D : Possible but extremely slow; removing 50+ elements one by one in the inspector is not "quick." Therefore, C is the best answer.
JavaScript Knowledge References (text-only)
* The browser console can run arbitrary JavaScript that manipulates the DOM.
* document.querySelectorAll() returns all matching DOM nodes.
* Nodes can be removed using .remove().

NEW QUESTION # 38
Which two console logs output NaN?
Choose 2 answers | |

A. console.loeg(10 / 'five');
B. console.log(parseInt ' ("two')) ;
C. console.log(10 / 0);
D. console.log(10 / Number('5) ) ;

Answer: B,D

NEW QUESTION # 39
Which statement accurately describes an aspect of promises?

A. .Them ( ) cannot be added after a catch.
B. .then ( ) manipulates and returns the original promise.
C. In a , them ( ) function, returning results is not necessary since callback will catch the result of a previous promise.
D. Agruments for the callback function passed to .then ( ) are optional.

Answer: D

NEW QUESTION # 40
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 2 to console.log('Hello' , name() );
B. Change line 9 to sayHello(world) ();
C. Change line 7 to ) () ;
D. Change line 5 to function world ( ) {

Answer: A

NEW QUESTION # 41
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?

A. import DatePrettyPrint from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();
B. import printDate from ' /path/DatePrettyPrint.js ' ;
printDate();
C. import DatePrettyPrint() from ' /path/DatePrettyPrint.js ' ;
printDate();
D. import printDate from ' /path/DatePrettyPrint.js ' ;
DatePrettyPrint.printDate();

Answer: B

Explanation:
ES Modules follow these rules:
* Default exports are imported using:
* import anyName from ' module '
The name chosen in the import does NOT need to match the exported name.
* If a module exports:
* export default function printDate() {}
then consuming code should import the function directly:
import printDate from ' /path/DatePrettyPrint.js ' ;
* To execute it:
* printDate();
Option analysis:
* A incorrect: import DatePrettyPrint() is invalid syntax. Also calling printDate() without importing it is incorrect.
* B incorrect: A default export imported as DatePrettyPrint gives the function itself, not an object containing methods. You cannot call DatePrettyPrint.printDate().
* C incorrect: Imports printDate but then calls DatePrettyPrint.printDate(), which does not exist.
* D correct: Correct import of a default-exported function. Correct direct invocation.
JavaScript Knowledge References (text-only)
* Default export # imported without braces.
* Importing default functions gives a callable function, not an object.
* Correct syntax: import identifier from " module " .

NEW QUESTION # 42
......

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