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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q53-Q58):

NEW QUESTION # 53
A developer at Universal Containers is creating their new landing page based on HTML, CSS, and JavaScript. The website includes multiple external resources that are loaded when the page is opened.
To ensure that visitors have a good experience, a script named personalizeWebsiteContent needs to be executed when the webpage Is loaded and there Is no need to wait for the resources to be available.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. windows,addEventListener('onload', personalizeWebsiteContent);
B. windows,addEventListener('load', personalizeWebsiteContent);
C. windows,addEventListener('onDOMCContentLoaded', personalizeWebsiteContent);
D. windows,addEventListener('DOMContent Loaded ', personalizeWebsiteContent);

Answer: B

NEW QUESTION # 54
Refer to the expression below:
Let x = ('1' + 2) == (6 + 2) ;
How should this expression be modified to ensure that a evaluated to false?

A. Let x = (1' + '2') === (6 / 2) ;
B. Let x = (1' + '2') === (6 + 2) ;
C. Let x = (1' + '2') == (6 + 2) ;
D. Let x = (1' + '2') == ('6' / 2) ;

Answer: B

NEW QUESTION # 55
Refer to the code below:

What is the value of result when the code executes?

A. 5-10
B. 5-5
C. 10-10
D. 10-5

Answer: C

NEW QUESTION # 56
What are two unique feature of function defined with a fat arror as compared to normal functional definition?
Choose 2 answers

A. The function receives an argument that is always in scope, called parent this, which is the enclosing lexical scope
B. The function uses the this from the enclosing scope.
C. The function generation its own this making it useful for separating the function's scope its enclosing scope
D. If the function has a single expression in the function body, the expression will be evaluated and implicitly returned.

Answer: D

NEW QUESTION # 57
A team that works on a big project uses npm to deal with projects dependencies.
A developer added a dependency does not get downloaded when they execute npm
install.
Which two reasons could be possible explanations for this?
Choose 2 answers

A. The developer added the dependency as a dev dependency, and
NODE_ENV is set to production.
B. The developer missed the option --save when adding the dependency.
C. The developer missed the option --add when adding the dependency.
D. The developer added the dependency as a dev dependency, and
NODE_ENV
Is set to production.

Answer: A,B,D

NEW QUESTION # 58
......

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