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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q20-Q25):

NEW QUESTION # 20
Refer to the code below:
Const pi = 3.1415326,
What is the data type of pi?

A. Number
B. Decimal
C. Double
D. Float

Answer: A

NEW QUESTION # 21
A developer has the function, shown below, that is called when a page loads.
function onload() {
console.log("Page has loaded!");
}
Where can the developer see the log statement after loading the page in the browser?

A. Browser javaScript console
B. Terminal running the web server.
C. On the webpage.
D. Browser performance toots

Answer: A

NEW QUESTION # 22
A developer is required to write a function that calculates the sum of elements in an array but is getting undefined every time the code is executed. The developer needs to find what is missing in the code below.
Const sumFunction = arr => {
Return arr.reduce((result, current) => {
//
Result += current;
//
), 10);
);
Which option makes the code work as expected?

A. Replace line 04 with result = result +current;
B. Replace line 02 with return arr.map(( result, current) => (
C. Replace line 05 with return result;
D. Replace line 03 with if(arr.length == 0 ) ( return 0; )

Answer: C

NEW QUESTION # 23
A developer creates a simple webpage with an input field. When a user enters text in the input field and clicks the button, the actual value of the field must be displayed in the console.
Here is the HTML file content:
<input type =" text" value="Hello" name ="input">
<button type ="button" >Display </button>
The developer wrote the javascript code below:
Const button = document.querySelector('button');
button.addEvenListener('click', () => (
Const input = document.querySelector('input');
console.log(input.getAttribute('value'));
When the user clicks the button, the output is always "Hello".
What needs to be done make this code work as expected?

A. Replace line 02 with button.addEventListener("onclick", function() {
B. Replace line 03 with const input = document.getElementByName('input');
C. Replace line 04 with console.log(input .value);
D. Replace line 02 with button.addCallback("click", function() {

Answer: C

NEW QUESTION # 24
Refer to the following code:
<html lang="en">
<body>
<divonclick = "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. Outer message
B. Outer messageInner message
C. Inner messageOuter message
D. Inner message

Answer: D

NEW QUESTION # 25
......

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