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| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented JavaScript | - Classes and Inheritance - Objects and Prototypes |
| Topic 2: Browser and DOM Interaction | - DOM Manipulation - Events and Event Handling |
| Topic 3: Salesforce Platform Integration | - Working with Salesforce Data Models - Lightning Web Components (LWC) Basics |
| Topic 4: Asynchronous Programming | - Callbacks, Promises, and Async/Await - API Calls and Data Fetching |
| Topic 5: JavaScript Fundamentals | - Functions and Scope - Control Flow and Error Handling - Variables, Data Types, and Operators |
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NEW QUESTION # 146
Refer to the code below:
01 let timedFunction = () => {
02 console.log('Timer called.');
03 };
04
05 let timerId = setInterval(timedFunction, 1000);
Which statement allows a developer to cancel the scheduled timed function?
Answer: B
Explanation:
The code:
let timerId = setInterval(timedFunction, 1000);
setInterval schedules timedFunction to run every 1000 ms.
It returns an interval ID (here stored in timerId), which is used to cancel the interval later.
To cancel:
Use clearInterval(timerId);
This is the standard browser (and Node.js) API:
let id = setInterval(fn, delay);
clearInterval(id); stops future executions of that interval.
Check other options:
B . removeInterval(timerId);
There is no removeInterval function in the standard JavaScript timer API.
C . removeInterval(timedFunction);
Again, no such function; and timers are cancelled by ID, not by the callback function reference.
D . clearInterval(timedFunction);
clearInterval expects the ID returned by setInterval, not the callback function.
Passing the function does not cancel the timer.
Therefore, the correct statement is:
Answe r: A
Study Guide / Concept Reference (no links):
Timer APIs: setInterval and clearInterval
Relationship between timer ID and cancellation
Difference between interval ID and callback function
Basic async timing patterns in JavaScript
NEW QUESTION # 147
A developer wants to use a module called DatePrettyPrint.
This module exports one default function called printDate().
How can the developer import and use printDate()?
Answer: D
Explanation:
________________________________________
Comprehensive and Detailed Explanation From Exact Extract JavaScript Knowledge ES Modules follow these rules:
Default exports are imported using:
import anyName from 'module'
The name chosen in the import does NOT need to match the exported name.
If a module exports:
export default function printDate() {}
then consuming code should import the function directly:
import printDate from '/path/DatePrettyPrint.js';
To execute it:
printDate();
Option analysis:
A incorrect:
import DatePrettyPrint() is invalid syntax.
Also calling printDate() without importing it is incorrect.
B incorrect:
A default export imported as DatePrettyPrint gives the function itself, not an object containing methods.
You cannot call DatePrettyPrint.printDate().
C incorrect:
Imports printDate but then calls DatePrettyPrint.printDate(), which does not exist.
D correct:
Correct import of a default-exported function.
Correct direct invocation.
________________________________________
JavaScript Knowledge Reference (text-only)
Default export โ imported without braces.
Importing default functions gives a callable function, not an object.
Correct syntax: import identifier from "module".
NEW QUESTION # 148
Given the following code:
Let x =null;
console.log(typeof x);
What is the output of the line 02?
Answer: A
NEW QUESTION # 149
A developer needs the function personalizeWebsiteContent to run when the webpage is fully loaded (HTML and all external resources).
Which implementation should be used?
Answer: C
Explanation:
JavaScript defines two main page-loading events:
DOMContentLoaded
Fires when the HTML document has been completely parsed.
External resources like images, stylesheets, iframe contents, etc. may not be loaded yet.
load event on window
Fires when:
HTML is fully parsed
All dependent resources (images, scripts, CSS, fonts, etc.) are fully loaded The requirement states:
"when the webpage is fully loaded (HTML content and all related files)" This aligns exactly with the window load event.
Implementation:
window.addEventListener("load", personalizeWebsiteContent);
This matches option B.
JavaScript knowledge references (text-only)
DOMContentLoaded fires after HTML parsing only.
load fires after all page resources finish loading.
The window object is the correct target for listening to the full load event.
NEW QUESTION # 150
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 functionpreviewFile(){
02 const preview = document.querySelector('img');
03 const file = document.querySelector('input[type=file]').files[0];
04 //line 4 code
05 reader.addEventListener("load", () => {
06 preview.src = reader.result;
07 },false);
08 //line 8 code
09 }
In lines 04 and 08, which code allows the user to select an image from their local computer , and to display the image in the browser?
Answer: B
NEW QUESTION # 151
......
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