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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Browser and DOM Interaction	- DOM manipulation and traversal - Event handling and propagation - Browser APIs (fetch, storage, timers)
Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Salesforce Platform Integration	- Calling Apex methods from JavaScript - Security considerations in Salesforce JavaScript - Lightning Web Components (LWC) JavaScript usage
Asynchronous JavaScript	- Event loop and concurrency model - Promises and async/await - Error handling in async workflows
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 (Q13-Q18):

NEW QUESTION # 13
A developer has a web server running with Node.js. The command to start the web server is node server.js. The web server started having latency issues. Instead of a one second turnaround for web requests, the developer now sees a five second turnaround.
Which command can the web developer run to see what the module is doing during the latency period?

A. DEBUG=true node server.js
B. DEBUG=http, https node server.js
C. NODE_DEBUG=true node server.js
D. NODE_DEBUG=http,https node server.js

Answer: A

NEW QUESTION # 14
Given code below:
setTimeout (() => (
console.log(1);
). 0);
console.log(2);
New Promise ((resolve, reject )) = > (
setTimeout(() => (
reject(console.log(3));
). 1000);
)).catch(() => (
console.log(4);
));
console.log(5);
What is logged to the console?

A. 1 2 4 3 5
B. 2 1 4 3 5
C. 1 2 5 3 4
D. 2 5 1 3 4

Answer: D

NEW QUESTION # 15
A developer has a formatName function that takes two arguments, firstName and lastName and returns a string. They want to schedule the
function to run once after five seconds.
What is the correct syntax to schedule this function?

A. setTimeout (formatName(), 5000, "John", "BDoe");
B. setTimeout (formatName('John', ''Doe'), 5000);
C. setTimout(() => { formatName("John', 'Doe') }, 5000);
D. setTimeout ('formatName', 5000, 'John", "Doe');

Answer: D

NEW QUESTION # 16
is below:
<input type="file" onchange="previewFile()">
<img src="" height="200" alt="Image Preview..."/>
The JavaScript portion is:
01 function previewFile(){
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 FileReader();
08 if (file) URL.createObjectURL(file);
C. 04 const reader = new File();
08 if (file) URL.createObjectURL(file);
D. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);

Answer: A

NEW QUESTION # 17
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. > 5 > -1
C. > true > false
D. > 5 >undefined

Answer: D

Explanation:

NEW QUESTION # 18
......

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