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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q118-Q123):

NEW QUESTION # 118
Which statement accurately describes an aspect of promises?

A. Arguments for the callback function passed to .then() are optional.
B. In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
C. .then() manipulates and returns the original promise.
D. .then() cannot be added after a catch.

Answer: A

NEW QUESTION # 119
Refer to the code below:
function changeValue(param) {
Param =5;
}
Let a =10;
Let b =5;
changeValue(b);
Const result = a+ " - "+ b;
What is the value of result when code executes?

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

Answer: C

NEW QUESTION # 120
Refer to the code below:
flag();
function flag() {
console.log( ' flag ' );
}
const anotherFlag = () = > {
console.log( ' another flag ' );
}
anotherFlag();
What is result of the code block?

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

Answer: C

Explanation:
Key points:
* Function declarations are hoisted (their definitions are available before the line where they appear).
* Function expressions assigned to const or let are not hoisted as callable functions, but here anotherFlag is only used after it is defined.
Step-by-step:
* flag(); at the top:
* flag is a function declaration defined later; due to hoisting, it is available.
* It logs ' flag ' .
* The declaration:
function flag() {
console.log( ' flag ' );
}
is already in effect (hoisted before execution).
* const anotherFlag = () = > { console.log( ' another flag ' ); } defines anotherFlag as an arrow function.
* anotherFlag(); is called after its definition; this is valid and logs ' another flag ' .
No errors occur. The console output is:
* flag
* another flag
So option D is correct.
Concepts: function hoisting, difference between function declarations and function expressions, execution order.

NEW QUESTION # 121
A developer is setting up a new Node.js server with a client library that is built using events and callbacks.
The library:
Will establish a web socket connection and handle receipt of messages to the server Will be imported with require, and made available with a variable called we.
The developer also wants to add error logging if a connection fails.
Given this info, which code segment shows the correct way to set up a client with two events that listen at execution time?

A. ws.connect (( ) => {
console.log('connected to client'); }).catch((error) => { console.log('ERROR' , error); }};
B. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};
C. try{
ws.connect (( ) => {
console.log('connected to client'); });
} catch(error) { console.log('ERROR' , error); };
}
D. ws.on ('connect', ( ) => {
console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' , error); });
});

Answer: B

NEW QUESTION # 122
Refer to the code:

Given the code above, which three properties are set pet1?
Choose 3 answers:

A. Name
B. Owner
C. canTalk
D. Size
E. Type

Answer: C,D,E

NEW QUESTION # 123
......

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