Quiz Salesforce - JavaScript-Developer-I - Salesforce Certified JavaScript Developer (JS-Dev-101)–Valid Online Lab Simulation

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Objects, Functions, and Classes	25%	- Modules and imports/exports - Class syntax, inheritance, and prototypes - Function definitions, parameters, and scope - Closures and execution context - Object creation, properties, and methods - Decorators and advanced function patterns
Topic 2: Testing	7%	- Unit testing concepts - Code coverage and best practices - Testing frameworks and assertions - Test doubles and mocks
Topic 3: Server-Side JavaScript	8%	- Core Node.js modules - Module system and require/import - Command-line tools and scripts - Node.js fundamentals and runtime
Topic 4: Asynchronous Programming	13%	- Async/await syntax - Callbacks and callback hell - Fetch API and HTTP requests - Event loop and micro/macro tasks - Promises and chaining
Topic 5: Variables, Types, and Collections	23%	- JSON parsing and usage - Type coercion and conversion rules - Array methods and data manipulation - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Truthy and falsy values
Topic 6: Debugging and Error Handling	7%	- Debugging tools and breakpoints - Error types and exception handling - Console methods and logging - Defensive programming practices
Topic 7: Browsers and Events	17%	- Script loading and execution order - Window and document object properties - Event handling, propagation, and delegation - Document Object Model (DOM) manipulation - Browser APIs and Web Storage

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Quiz Efficient Salesforce - Online JavaScript-Developer-I Lab Simulation

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q41-Q46):

NEW QUESTION # 41
Refer to the code below:
Const searchTest = 'Yay! Salesforce is amazing!" ;
Let result1 = searchText.search(/sales/i);
Let result 21 = searchText.search(/sales/i);
console.log(result1);
console.log(result2);
After running this code, which result is displayed on the console?

A. > 5 > 0
B. > true > false
C. > 5 >undefined
D. > 5 > -1

Answer: C

NEW QUESTION # 42
Refer to the code below:
< html >
< body >
< div id= " logo " > Hello Logo! < /div >
< button id= " test " > Click me < /button >
< /body >
< script >
function printMessage(event) {
console.log( ' This is a test message ' );
}
let el = document.getElementById( ' test ' );
el.addEventListener( " click " , printMessage, false);
< /script >
< /html >
Which action should be done?

A. Add event.removeEventListener(); to window.onload event handler
B. Add event.stopPropagation(); to printMessage function
C. Add event.removeEventListener(); to printMessage function
D. Add event.stopPropagation(); to window.onload event handler

Answer: B

Explanation:
The correct answer is C .
The typing errors in the options should be corrected as follows:
event.stopPropagation();
The stopPropagation() method is used to stop an event from continuing through the DOM event propagation path.
A click event normally goes through these phases:
Capturing phase # Target phase # Bubbling phase
Because the event listener is attached to the button:
el.addEventListener( " click " , printMessage, false);
the function printMessage receives the click event when the button is clicked. To stop the event from bubbling up to parent elements, the event object should be accepted as a parameter and stopPropagation() should be called inside the event handler.
Corrected code:
< html >
< body >
< div id= " logo " > Hello Logo! < /div >
< button id= " test " > Click me < /button >
< /body >
< script >
function printMessage(event) {
event.stopPropagation();
console.log( ' This is a test message ' );
}
let el = document.getElementById( ' test ' );
el.addEventListener( " click " , printMessage, false);
< /script >
< /html >
Why this is correct:
event.stopPropagation();
prevents the click event from moving upward to ancestor elements after the button's handler runs.
Why the other options are incorrect:
A and B are incorrect because removeEventListener() is used to remove a previously registered event listener.
It does not stop event bubbling for the current event.
D is incorrect because stopPropagation() should be called inside the active event handler that receives the event object. In this case, that function is:
printMessage(event)
Therefore, the verified answer is C .

NEW QUESTION # 43
GIven a value, which three options can a developer use to detect if the value is NaN?
Choose 3 answers !

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

Answer: C,E

NEW QUESTION # 44
A developer has a module that contains multiple functions.
What kind of export should be leveraged so that multiple functions can be used?

A. all
B. default
C. multi
D. named

Answer: D

Explanation:
The correct answer is D .
When a module contains multiple functions and each function should be available individually, the best choice is a named export .
Example:
function add(a, b) {
return a + b;
}
function subtract(a, b) {
return a - b;
}
export { add, subtract };
Then another file can import exactly the functions it needs:
import { add, subtract } from ' ./mathUtils.js ' ;
console.log(add(5, 2));
console.log(subtract(5, 2));
Named exports are useful when a module provides several reusable functions, constants, or classes.
Why the other options are incorrect:
multi is not a JavaScript export type.
default is usually used when a module has one main value to export. A module can only have one default export.
all is not an export type in JavaScript module syntax.
Therefore, the correct export type for multiple functions is named export , so the verified answer is D .

NEW QUESTION # 45
Which javascript methods can be used to serialize an object into a string and deserialize
a JSON string into an object, respectively?

A. JSON.stringify and JSON.parse
B. JSON.parse and JSON.deserialize
C. JSON.encode and JSON.decode
D. JSON.serialize and JSON.deserialize

Answer: A

NEW QUESTION # 46
......

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