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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q55-Q60):

NEW QUESTION # 55
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. setTimeout(isDeg( ' cat ' ), 60000);
B. setInterval(isDeg( ' cat ' ), 60000);
C. setTimeout(isDeg, 60000, ' cat ' );
D. setInterval(isDeg, 60000, ' cat ' );

Answer: D

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 # 56
Refer to the following code:
<html lang="en">
<body>
<div onclick = "console.log('Outer message') ;">
<button id ="myButton">CLick me<button>
</div>
</body>
<script>
function displayMessage(ev) {
ev.stopPropagation();
console.log('Inner message.');
}
const elem = document.getElementById('myButton');
elem.addEventListener('click' , displayMessage);
</script>
</html>
What will the console show when the button is clicked?

A. Inner message
B. Outer message
C. Inner message
Outer message
D. Outer message
Inner message

Answer: A

NEW QUESTION # 57
A developer is trying to convince management that their team will benefit from using Node.JS for a backend server that they are going to create. The server will be a web server that handles API requests from a website that the team has already built using HTML, CSS, and JavaScript.
Which three benefits of Node.js can the developer use to persuade their manager?
Which three benefits of Node.js can the developer use to persuade their manager?

A. Installs with its own package manager to install and manage third-party libraries.
B. Executes server-side JavaScript code to avoid learning a new language.
C. Performs a static analysis can code before execution to look for runtime errors.
D. Uses non-blocking functionality for performant request handling
E. Ensure stability with one major release every few years.

Answer: C

NEW QUESTION # 58
Refer to the string below.
Const str='Salesforce';
Which two statements results in the word 'Sales'?

Answer:

Explanation:
Str.substring(0,5);
Str.substr(0,5);

NEW QUESTION # 59
A developer has an ErrorMandler module that contains multiple functions.
What kind of export should be leveraged so that multiple function can be used?

A. All
B. default
C. Named
D. Multi

Answer: C

NEW QUESTION # 60
......

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