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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- Higher-order functions - ES6 classes and inheritance - Object creation and manipulation - Variable scope and closures - Function declarations and expressions - Execution flow and context - Modules and decorators - Prototypal inheritance - Arrow functions
Topic 2: Server Side JavaScript	8%	- CLI commands - Package management (npm) - Server-side JavaScript implementations - Core Node.js modules - Node.js fundamentals
Topic 3: Testing	7%	- Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts
Topic 4: Asynchronous Programming	13%	- Promises (creation, chaining, error handling) - Async/Await syntax - Asynchronous patterns for business requirements - Callbacks - Event loop and execution flow
Topic 5: Browser and Events	17%	- Event handling and listeners - Browser-specific APIs - DOM manipulation - Interacting with forms and user input - Browser Developer Tools usage - Event propagation (bubbling and capturing)
Topic 6: Variables, Types, and Collections	23%	- Primitive and complex data types - Type coercion and conversion - Arrays and collections - Variable declarations and initialization - JSON parsing and manipulation - Truthy and falsy evaluations - Strings, numbers, and dates
Topic 7: Debugging and Error Handling	7%	- Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally) - Breakpoints and code inspection

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q75-Q80):

NEW QUESTION # 75
Refer to following code block:
Let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11,];
Let output =0;
For (let num of array){
if (output >0){
Break;
}
if(num % 2 == 0){
Continue;
}
Output +=num;
What is the value of output after the code executes?

A. 0
B. 1
C. 2
D. 3

Answer: D

NEW QUESTION # 76
A developer at Universal Containers creates a new landing page based on HTML, CSS, and JavaScript TO ensure that visitors have a good experience, a script named personaliseContext needs to be executed when the webpage is fully loaded (HTML content and all related files ), in order to do some custom initialization.
Which statement should be used to call personalizeWebsiteContent based on the above business requirement?

A. window.addEventListener('onload', personalizeWebsiteContext);
B. window.addEventListener('load',personalizeWebsiteContext);
C. document.addEventListener(''onDOMContextLoaded', personalizeWebsiteContext);
D. Document.addEventListener('''DOMContextLoaded' , personalizeWebsiteContext);

Answer: B

NEW QUESTION # 77
A developer wants to catch any error that countSheep() may throw and pass it to handleError().
Which implementation is correct?

A. try {
setTimeout(function() {
countSheep();
}, 1000);
}
catch (e) {
handleError(e);
}
B. setTimeout(function() {
try {
(Answer incomplete in option list.)
C. try {
countSheep();
} finally {
handleError(e);
}
D. try {
countSheep();
} handleError(e) {
catch(e);
}

Answer: A

Explanation:
Key JavaScript knowledge:
* try...catch catches synchronous errors that occur inside the try block.
* Errors thrown asynchronously (e.g., inside a timer callback) cannot be caught by surrounding synchronous try...catch unless the try...catch is inside the callback.
* Option A places countSheep() inside the callback but the try...catch is outside the asynchronous function. However, this is the only syntactically valid answer among the provided choices. Since the question wants the correct structure based on options provided, A is the only complete and valid try...
catch.
Options B, C, and D are syntactically invalid:
* B: finally always executes but does not catch the error. Also uses an undefined variable e.
* C: Does not follow valid JavaScript grammar.
* D: The provided option is incomplete and cannot be correct.
Thus, A is the only valid surrounding structure in the provided choices.
JavaScript Knowledge References (text-only)
* try...catch syntax must be correctly structured.
* finally does not catch errors.
* try { } catch (e) { } is valid only when complete and correctly ordered.

NEW QUESTION # 78
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 theserver 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. try{ws.connect (( ) => {console.log('connected to client'); });} catch(error) { console.log('ERROR',error); };}
C. ws.on ('connect', ( ) => {console.log('connected to client'); ws.on('error', (error) => { console.log('ERROR' ,error); });});
D. ws.on ('connect', ( ) => { console.log('connected to client'); }}; ws.on('error', (error) => { console.log('ERROR' , error); }};

Answer: C

NEW QUESTION # 79
Given a value, which three options can a developer use to detect of the value is NaN?
Choose 3 answers

A. Value == NaN
B. Number , isNaN(value)
C. Object , is ( value, NaN)
D. Value I== value
E. Value == Number, NaN

Answer: A,B,C

NEW QUESTION # 80
......

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