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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q33-Q38):

NEW QUESTION # 33
A developer wrote the following code to test a sum3 function that takes in an array of numbers and returns the sum of the first three numbers in the array, and the test passes.
A different developer made changes to the behavior of sum3 to instead sum only the first two numbers present in the array.

Which two results occur when running this test on the updated sum3 function?
Choose 2 answers

A. The line 05 assertion fails.
B. The line 05 assertion passes.
C. The line 02 assertion passes.
D. The line 02 assertion fails.

Answer: A,C

NEW QUESTION # 34
Refer to the code below:
01 const server = require('server');
02 /* Insert code here */
A developer imports a library that creates a web server. Theimported library uses events and callbacks to start the servers Whichcode should be inserted at the line 03 to set up an event and start the web server ?

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

Answer: E

NEW QUESTION # 35
A developer wants to create a simple image upload using the File API.
HTML:
< input type= " file " onchange= " previewFile() " >
< img src= " " height= " 200 " alt= " Image preview... " / >
JavaScript:
01 function previewFile() {
02 const preview = document.querySelector( ' img ' );
03 const file = document.querySelector( ' input[type=file] ' ).files[0];
04 // line 4 code
05 reader.addEventListener( " load " , () = > {
06 preview.src = reader.result;
07 }, false);
08 // line 8 code
09 }
Which code in lines 04 and 08 allows the selected local image to be displayed?

A. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file);
B. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);

Answer: A

Explanation:
The File API in browsers provides the FileReader object to read file contents selected from < input type= " file " > .
Important knowledge points:
* new FileReader() creates a file-reading object.
* .readAsDataURL(file) reads a file and produces a Base64 URL string.
* The " load " event fires when the file has finished reading.
* reader.result contains the data URL after reading completes.
Therefore, the correct implementation must:
* Create a FileReader instance:
* const reader = new FileReader();
* Call:
* reader.readAsDataURL(file);
* Use the load event handler to assign the image preview:
* preview.src = reader.result;
Option B is the only option that matches valid JavaScript File API usage.
Option A is incorrect because File is not a constructor for reading files.
Option C is incorrect because URL.createObjectURL(file) must be assigned directly as a URL, not used with reader.result.
JavaScript Knowledge References (text-only)
* The file-reading interface in browsers is FileReader.
* readAsDataURL() loads files as Base64 data URLs.
* The load event indicates when the reader has finished and reader.result is available.

NEW QUESTION # 36
Given the following code:

What is the logged by the first four log statements?

A. 0 1 2 3
B. 0 1 1 2
C. 0 0 1 2
D. 0 1 2 2

Answer: B

NEW QUESTION # 37
Given the following code:
let x = null;
console.log(typeof x);
What is the output?

A. "x"
B. "undefined"
C. "object"
D. "null"

Answer: C

NEW QUESTION # 38
......

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