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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

SectionObjectives
Topic 1: Asynchronous JavaScript- Error handling in async workflows
- Promises and async/await
- Event loop and concurrency model
Topic 2: Browser and DOM Interaction- DOM manipulation and traversal
- Browser APIs (fetch, storage, timers)
- Event handling and propagation
Topic 3: Salesforce Platform Integration- Calling Apex methods from JavaScript
- Lightning Web Components (LWC) JavaScript usage
- Security considerations in Salesforce JavaScript
Topic 4: Testing and Debugging- Debugging techniques and tools
- Unit testing principles
Topic 5: 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 (Q66-Q71):

NEW QUESTION # 66
A developer wrote the following code:
01 let X = object.value;
02
03 try {
04handleObjectValue(X);
05 } catch (error) {
06 handleError(error);
07 }
Thedeveloper has a getNextValue function to execute after handleObjectValue(), but does not want to execute getNextValue() if an error occurs.
How can the developer change the code to ensure this behavior?

Answer: D


NEW QUESTION # 67
A developer is trying to handle an error within a function.
Which code segment shows the correct approach to handle an error without propagating it elsewhere?

Answer: A


NEW QUESTION # 68
Which statement allows a developer to update the browser navigation history without a page refresh?

Answer: D

Explanation:
The correct answer is C .
The browser provides the History API through:
window.history
To add a new entry to the browser's session history without refreshing the page, JavaScript uses:
window.history.pushState(state, title, url);
So the valid statement is:
window.history.pushState(newStateObject, ' ' , null);
This updates the browser history stack without forcing a full page reload. It is commonly used in single-page applications when changing views or routes dynamically.
The method accepts three arguments:
window.history.pushState(stateObject, title, url);
stateObject stores custom data associated with the history entry.
title is usually passed as an empty string because many browsers ignore it.
url optionally changes the displayed URL. Passing null means no new URL is provided.
Option A is incorrect because:
window.customHistory
is not the standard browser History API object.
Option B is incorrect because:
createState()
is not a valid History API method.
Option D is incorrect because:
updateState()
is not a valid History API method.
The correct browser API method is:
window.history.pushState()
Therefore, the verified answer is C .


NEW QUESTION # 69
Refer to the HTML below:

Which expression outputs the screen width of the element with the ID card-01?

Answer: C


NEW QUESTION # 70
Given the following code:
document.body.addEventListener(' click ', (event) => {
if (/* CODE REPLACEMENT HERE */) {
console.log('button clicked!');
)
});
Which replacement for the conditional statement on line 02 allows a developer to correctly determine that a button on page is clicked?

Answer: B


NEW QUESTION # 71
......

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