JavaScript-Developer-I Valid Dump - Reliable JavaScript-Developer-I Exam Syllabus

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q104-Q109):

NEW QUESTION # 104
Given the following code:

is the output of line 02?

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

Answer: A

NEW QUESTION # 105
developer wants to use a module named universalContainersLib and them call functions
from it.
How should a developer import every function from the module and then call the fuctions foo
and bar ?

A. import all from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();
B. import * ad lib from '/path/universalContainersLib.js';
lib.foo();
lib.bar();
C. import (foo, bar) from '/path/universalContainersLib.js';
foo();
bar();
D. import * from '/path/universalContaineraLib.js';
universalContainersLib.foo();
universalContainersLib.bar();

Answer: B

NEW QUESTION # 106
A developer has the function, shown below, that is called when a page loads.

Where can the developer see the log statement after loading the page in the browser?

A. On the browser JavaScript console
B. In the browser performance tools log
C. On the webpage console log
D. On the terminal console running the web server

Answer: A

NEW QUESTION # 107
Refer to the code below:

What is display when the cod executes?

A. null
B. Undefined
C. A
D. ReferenceError: b is not defined

Answer: C

NEW QUESTION # 108
After user acceptance testing, the developer is asked to change the webpage background based on user's location. This change was implemented and deployed for testing.
The tester reports that the background is not changing, however it works as required when viewing on the developer's computer.
Which two actions will help determine accurate results?
Choose 2 answers

A. The tester should disable their browser cache.
B. The developer should inspect their browser refresh settings.
C. The tester should dear their browser cache.
D. The developer should rework the code.

Answer: B,C

NEW QUESTION # 109
......

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