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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q102-Q107):

NEW QUESTION # 102
Refer to the code below:
01 const server = require( ' server ' );
02
03 // Insert code here
A developer imports a library that creates a web server. The imported library uses events and callbacks to start the server.
Which code should be inserted at line 03 to set up an event and start the web server?

A. server.start();
B. server();
C. server.on( ' connect ' , (port) = > { console.log( ' Listening on ' , port); });
D. server((port) = > { console.log( ' Listening on ' , port); });

Answer: D

Explanation:
The question specifies:
* The library "uses events and callbacks to start the server".
* We want to "set up an event and start the web server".
Option C:
server((port) = > { console.log( ' Listening on ' , port); });
This:
* Calls server(...), which (by design in such libraries) typically starts the web server.
* Passes a callback function that receives port when the server is ready.
* Inside the callback, it logs " Listening on < port > " .
This matches the "events and callbacks" description: the callback is invoked when the server has started listening.
Why others are incorrect:
* A. server.on( ' connect ' , ...)
* Assumes server is an event emitter instance with a ' connect ' event, which is not given. Also, this line alone would not start the server.
* B. server.start();
* Assumes a start method exists; the question says the library "uses events and callbacks to start," implying invocation with a callback, not a plain start() call.
* D. server();
* Might start the server, but does not "set up an event" or callback to know when or where it is listening.
Therefore, C aligns with the described usage.
Concepts: callback-based APIs, starting servers with callbacks, event/callback style vs simple method calls.

NEW QUESTION # 103
Given the HTML below:

Which statement adds the priority-account CSS class to the Universal Containers row?

A. document. queryselector('#row-uc').ClassList.add('priority-account');
B. document. getElementByid('row-uc').addClass('priority-account*);
C. document. querySelectorAll('#row-uc') -classList.add("priority-accour');
D. document. querySelector (#row-uc'). classes-push('priority-account');

Answer: A

NEW QUESTION # 104
Refer to the following array:
Let arr1 = [ 1, 2, 3, 4, 5 ];

Which two lines of code result in a second array, arr2 being created such that arr2 is not a reference to arr1?

A. Let arr2 = Array.from(arr1);
B. Let arr2 = arr1;
C. Let arr2 = arr1.slice(0, 5);
D. Let arr2 = arr1.sort();

Answer: A,C

NEW QUESTION # 105
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon, starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

A. productSKU = productSKU .padStart (19. '0').padstart('sku');
B. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');
C. productSKU = productSKU .padEnd (16. '0').padstart('sku');
D. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');

Answer: D

NEW QUESTION # 106
developer is trying to convince management that their team will benefit from using
Node.js for a backend server that they are going to create. The server will be a web server that
handles API requests from a website that the team has already built using HTML, CSS, and
JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Choose 3 answers:

A. Executes server-side JavaScript code to avoid learning a new language.
B. I nstalls with its own package manager to install and manage third-party libraries.
C. Ensures stability with one major release every few years.
D. Performs a static analysis on code before execution to look for runtime errors.
E. User non blocking functionality for performant request handling .

Answer: B,D,E

NEW QUESTION # 107
......

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