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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q142-Q147):

NEW QUESTION # 142
Given the code below:

Which method can be provide a visual representation of the list if users and to allow sorting by the name or email attributes.

A. Console.groupCollapsed (userslist);
B. Console.info (userlist);
C. Console.group (userList);
D. Console,table (userslist);

Answer: C

NEW QUESTION # 143
A developer implements and calls the following code when an application state change occurs:

If the back button is clicked after this method is executed, what can a developer expect?

A. The page is navigated away from and previous page in the browser's history is loaded.
B. A popstate event is fired with a state properly that details the application's last state.
C. A navigate event is fired with a state properly that details previous application state.
D. The page reloads and all JavaScript is reinitialized.

Answer: A

NEW QUESTION # 144
Refer to HTML below:
<div id ="main">
<div id = " card-00">This card is smaller.</div>
<div id = "card-01">The width and height of this card is determined by its
contents.</div>
</div>
Which expression outputs the screen width of the element with the ID card-01?

A. document.getElementById(' card-01 ').width
B. document.getElementById(' card-01 ').style.width
C. document.getElementById(' card-01 ').innerHTML.lenght*e
D. document.getElementById(' card-01 ').getBoundingClientRest().width

Answer: D

NEW QUESTION # 145
Teams at Universal Containers (CU) work on multiple JavaScript projects at the same time. UC us 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 spm, but packages can be installed vis URL.
B. Private register are not supported by npm, but packages can be installed via git.
C. Private packages can be scoped, and scopes can be associated to a private registries.
D. Private packages are not supported, but they can use another package manager like yarm.

Answer: D

NEW QUESTION # 146
developer creates a new web server that uses Node.js. It imports a server library that
uses events and callbacks for handling server functionality.
The server library is imported with require and is made available to the code by a
variable named server. The developer wants to log any issues that the server has while booting
up.
Given the code and the information the developer has, which code logs an error at boost
with an event?

A. Server.on ('error', (error) => {
console.log('ERROR', error);
});
B. Server.error ((server) => {
console.log('ERROR', error);
});
C. Try{
server.start();
} catch(error) {
D. Server.catch ((server) => {
console.log('ERROR', error);
});

Answer: A

Explanation:
console.log('ERROR', error);
}

NEW QUESTION # 147
......

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