Exam Discount Salesforce JavaScript-Developer-I Voucher - JavaScript-Developer-I Detailed Study Dumps

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q69-Q74):

NEW QUESTION # 69
A developer is leading the creation of a new web server for their team that will fulfill API requests from an existing client.
The team wants a web server that runs on Node.Js, and they want to use the new web framework Minimalist.Js. The lead developer wants to advocate for a more seasoned back-end framework that already has a community around it.
Which two frameworks could the lead developer advocate for?
Choose 2 answers

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

Answer: B,C

NEW QUESTION # 70
Refer to the code below:

What is the output if this function when called with an empty array?

A. Retruns 0
B. Return 10
C. Throws an error
D. Return NaN

Answer: B

NEW QUESTION # 71
The developer has a function that prints "Hello" to an input name. To test this, thedeveloper created a function that returns "World". However the following snippet does not print " Hello World".

What can the developer do to change the code to print "Hello World" ?

A. Change line 5 to function world ( ) {
B. Change line 2 to console.log('Hello' , name() );
C. Change line 7 to ) () ;
D. Change line 9 to sayHello(world) ();

Answer: B

NEW QUESTION # 72
A developer is working on an ecommerce website where the delivery date is dynamically
calculated based on the current day. The code line below is responsible for this calculation.
Const deliveryDate = new Date ();
Due to changes in the business requirements, the delivery date must now be today's
date + 9 days.
Which code meets this new requirement?

A. deliveryDate.date = new Date(+9) ;
B. deliveryDate.setDate( Date.current () + 9);
C. deliveryDate.setDate(( new Date ( )).getDate () +9);
D. deliveryDate.date = Date.current () + 9;

Answer: C

NEW QUESTION # 73
Corrected code:
let a = " * " ;
let b = " ** " ;
// x = 3;
console.log(a);
What is displayed when the code executes?

A. null
B. undefined
C. ReferenceError: a is not defined
D. *

Answer: D

Explanation:
The correct answer is B because variable a is declared and initialized before it is printed.
let a = " * " ;
This creates a block-scoped variable named a and assigns it the string value:
" * "
The line:
// x = 3;
is a comment. JavaScript ignores comments during execution, so this line has no effect.
Then this line runs:
console.log(a);
Since a already exists and contains " * " , the console displays:
* Option A is incorrect because a is defined.
Option C is incorrect because a has an assigned value, so it is not undefined.
Option D is incorrect because a was never assigned null.
Therefore, the verified answer is B .

NEW QUESTION # 74
......

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