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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q12-Q17):

NEW QUESTION # 12
Refer to the code below:

What is the value of result when the code executes?

A. 10-10
B. 10-5
C. 5-10
D. 5-5

Answer: A

NEW QUESTION # 13
Universal Containers recently launched its new landing page to host a crowd-funding campaign. The page uses an external library to display some third-party ads. Once the page is fully loaded, it creates more than 50 new HTML items placed randomly inside the DOM, like the one in the code below:

All the elements includes the same ad-library-item class, They are hidden by default, and they are randomly displayed while the user navigates through the page.

A. Use the DOM inspector to remove all the elements containing the class ad-library-item.
B. Use the browser to execute a script that removes all the element containing the class ad-library-item.
C. Use the browser console to execute a script that prevents the load event to be fired.
D. Use the DOM inspector to prevent the load event to be fired.

Answer: A

NEW QUESTION # 14
At Universal Containers, every team has its own way of copying JavaScript objects. The code snippet shows an Implementation from one team:

What is the output of the code execution?

A. Hello John Doe
B. Hello Dan Doe
C. SyntaxError: Unexpected token in JSON
D. Hello Dan

Answer: C

NEW QUESTION # 15
Given the code below:
01 setCurrentUrl();
02 console.log( " The current URL is: " + url);
03
04 function setCurrentUrl() {
05 url = window.location.href;
06 }
What happens when the code executes?

A. The url variable has local scope and line 02 executes correctly.
B. The url variable has local scope and line 02 throws an error.
C. The url variable has global scope and line 02 throws an error.
D. The url variable has global scope and line 02 executes correctly.

Answer: D

Explanation:
* Inside setCurrentUrl, url is assigned without var, let, or const :
url = window.location.href;
* In non-strict mode, this implicitly creates a global variable url on window.
Execution order:
* setCurrentUrl(); creates/sets global url to window.location.href.
* console.log( " The current URL is: " + url); has access to url in global scope and prints correctly.
Thus:
* url has global scope.
* Line 02 runs without error and logs a valid string.
So B is correct.

NEW QUESTION # 16
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
Outer message
B. Outer message
C. Outer message
Inner message
D. Inner message

Answer: D

NEW QUESTION # 17
......

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