Free JavaScript-Developer-I Practice Exams | JavaScript-Developer-I Study Material

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Asynchronous JavaScript	- Error handling in async workflows - Event loop and concurrency model - Promises and async/await
Salesforce Platform Integration	- Lightning Web Components (LWC) JavaScript usage - Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript
Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Browser and DOM Interaction	- DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers)
JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q56-Q61):

NEW QUESTION # 56
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?

A. 04 const reader = new FileReader();08 if (file) reader.readAsDataURL(file);
B. 04 const reader = new File();08 if (file) reader.readAsDataURL(file);
C. 04 const reader = new File();08 if (file) URL.createObjectURL(file);
D. 04 const reader = new FileReader();08if (file) URL.createObjectURL(file);

Answer: A

NEW QUESTION # 57
Refer to code below:
Let productSKU = '8675309' ;
A developer has a requirement to generate SKU numbers that are always 19 characters lon,
starting with 'sku', and padded with zeros.
Which statement assigns the values sku0000000008675309 ?

A. productSKU = productSKU .padStart (19. '0').padstart('sku');
B. productSKU = productSKU .padEnd (16. '0').padstart('sku');
C. productSKU = productSKU .padStart (16. '0').padstart(19, 'sku');
D. productSKU = productSKU .padEnd (16. '0').padstart(19, 'sku');

Answer: C

NEW QUESTION # 58
A developer has an isDeg function that takes one argument, pts. They want to schedule the function to run every minute.
What is the correct syntax for scheduling this function?

A. setInterval(isDeg, 60000, ' cat ' );
B. setInterval(isDeg( ' cat ' ), 60000);
C. setTimeout(isDeg( ' cat ' ), 60000);
D. setTimeout(isDeg, 60000, ' cat ' );

Answer: A

Explanation:
* setInterval(fn, delay, arg1, arg2, ...) calls fn every delay ms, passing extra arguments.
* To call isDeg every 60 seconds with " cat " :
setInterval(isDeg, 60000, ' cat ' );
Why others are wrong:
* A/D: isDeg( ' cat ' ) is called immediately, and its return value is scheduled, not the function.
* C: setTimeout runs once after 60 seconds, not repeatedly.

NEW QUESTION # 59
Refer to the code below:

Which code change should be made for the console to log only Row log when 'Click mel' is clicking?

A. Add event,stopPropagation (); to window.onLoad event hadler.
B. Add event,stopPropagation (); to printMessage function.
C. Add event,stopPropagation (); to printMessage function.
D. Add event,stopPropagation (); to window,onLoad event hadler.

Answer: A,C

NEW QUESTION # 60
Refer to thefollowing code that imports a module named utils:
import (foo, bar) from '/path/Utils.js';
foo() ;
bar() ;
Which two implementations of Utils.js export foo and bar such that the code above runs without error?
Choose 2 answers

A. Export default class {foo() { return 'foo' ; }bar() { return 'bar' ; }}
B. // FooUtils.js and BarUtils.js existImport (foo) from '/path/FooUtils.js';Import (boo) from '
/path/NarUtils.js';
C. const foo = () => { return 'foo' ; }const bar = () => { return 'bar' ; }export { bar, foo }
D. const foo = () => { return 'foo';}const bar = () => {return 'bar'; }Export default foo, bar;

Answer: A,C

NEW QUESTION # 61
......

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