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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Testing	7%	- Unit testing concepts - Testing frameworks and assertions - Test doubles and mocks - Code coverage and best practices
Topic 2: Debugging and Error Handling	7%	- Error types and exception handling - Console methods and logging - Defensive programming practices - Debugging tools and breakpoints
Topic 3: Asynchronous Programming	13%	- Promises and chaining - Callbacks and callback hell - Async/await syntax - Fetch API and HTTP requests - Event loop and micro/macro tasks
Topic 4: Objects, Functions, and Classes	25%	- Decorators and advanced function patterns - Object creation, properties, and methods - Closures and execution context - Modules and imports/exports - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope
Topic 5: Server-Side JavaScript	8%	- Module system and require/import - Core Node.js modules - Node.js fundamentals and runtime - Command-line tools and scripts
Topic 6: Browsers and Events	17%	- Window and document object properties - Script loading and execution order - Browser APIs and Web Storage - Document Object Model (DOM) manipulation - Event handling, propagation, and delegation
Topic 7: Variables, Types, and Collections	23%	- Variable declaration and initialization - Truthy and falsy values - Type coercion and conversion rules - JSON parsing and usage - Array methods and data manipulation - Working with strings, numbers, dates, and booleans

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q126-Q131):

NEW QUESTION # 126
What is the result of the code block?

A. An error is thrown.
B. The console logs only 'flag'.
C. The console logs 'flag' and then an error is thrown.
D. The console logs 'flag' and another flag.

Answer: B

NEW QUESTION # 127
A developer is setting up a Node.js server and is creating a script at the root of the source code, index.js, that will start the server when executed. The developer declares a variable that needs the folder location that the code executes from.
Which global variable can be used in the script?

A. __dirname
B. this.path
C. window.location
D. __filename

Answer: A

Explanation:
In Node.js:
* __filename is the absolute path to the current file (including file name).
* __dirname is the absolute path to the directory that contains the current file.
* window.location is a browser-only global, not available in Node.js.
* this.path is not a standard Node.js global for path information.
The requirement is:
"the folder location that the code executes from."
That is exactly what __dirname provides.
So the correct choice is __dirname.
Concepts: Node.js globals, __filename, __dirname, Node vs browser environment.

NEW QUESTION # 128
A developer is leading the creation of a new browser application that will serve a single page application. The team wants to use a new web framework Minimalsit.js. The Lead developer wants to advocate for a more seasoned web framework that already has a community around it.
Which two frameworks should the lead developer advocate for?
Choose 2 answers

A. Express
B. Vue
C. Angular
D. Koa

Answer: A,C

NEW QUESTION # 129
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200"alt="Image Preview..."/>
The JavaScript portion is:
01 functionpreviewFile(){
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 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?

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

Answer: C

NEW QUESTION # 130
Refer to the code below:

Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a specific element, myElement on the page had been clicked?

Answer:

Explanation:
event.target.id =='myElement'

NEW QUESTION # 131
......

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