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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q20-Q25):

NEW QUESTION # 20
Refer to code below:
function Person() {
this.firstName = 'John';
}
Person.prototype ={
Job: x => 'Developer'
};
const myFather = new Person();
const result =myFather.firstName + ' ' + myFather.job();
What is the value of the result after line 10 executes?

A. John undefined
B. Error: myFather.job is not a function
C. John Developer
D. Undefined Developer

Answer: B

NEW QUESTION # 21
myArraym can have one level, two levels, or more levels.
Which statement flattens myArray when it can be arbitrarily nested?

A. myArray. reduce ((prev, curr) => prev.concat(curr) [ ]);
B. myArray. join (","). split (",");
C. [ ] .concat {. . .myArray) ;
D. myArray.flat(Infinity);

Answer: A

NEW QUESTION # 22
A developer creates a class that represents a blog post based on the requirement that a
Post should have a body author and view count.
The Code shown Below:
Class Post {
// Insert code here
This.body =body
This.author = author;
this.viewCount = viewCount;
}
}
Which statement should be inserted in the placeholder on line 02 to allow for a variable to be set
to a new instanceof a Post with the three attributes correctly populated?

A. Function Post (body, author, viewCount) {
B. super (body, author, viewCount) {
C. constructor (body, author, viewCount) {
D. constructor() {

Answer: C

NEW QUESTION # 23
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 # 24
A developer writes the code below to calculate the factorial of a given number function sum(number){ return number * sum(number-1);
}
sum(3);
what is the result of executing the code.

A. 0
B. -Infinity
C. 1
D. Error

Answer: D

NEW QUESTION # 25
......

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