JavaScript-Developer-I Exams Collection - JavaScript-Developer-I Reliable Test Syllabus

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Topic 1: Testing and Debugging	- Unit testing principles - Debugging techniques and tools
Topic 2: JavaScript Language Fundamentals	- Data types, variables, and operators - Functions, scope, and closures - ES6+ syntax and features
Topic 3: Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage
Topic 4: Browser and DOM Interaction	- Event handling and propagation - DOM manipulation and traversal - Browser APIs (fetch, storage, timers)
Topic 5: Asynchronous JavaScript	- Promises and async/await - Error handling in async workflows - Event loop and concurrency model

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q142-Q147):

NEW QUESTION # 142
Which statement accurately describes the behavior of the async/await keywords?

A. The associated function sometimes returns a promise.
B. The associated function can only be called via asynchronous methods.
C. The associated function is asynchronous, but acts like synchronous code.
D. The associated class contains some asynchronous functions.

Answer: C

Explanation:
When async is added to a function:
async function example() {}
JavaScript guarantees:
* The function always returns a Promise , regardless of what is returned inside.
* Inside the function, await pauses execution until a Promise resolves.
* Code appears synchronous even though it uses asynchronous behavior.
Analysis of each option:
* A incorrect: Not " sometimes " -an async function always returns a Promise.
* B incorrect: Async functions can be called just like normal functions.
* C incorrect: Async/await has nothing to do with classes specifically.
* D correct: This is the standard description: "Async functions behave asynchronously but allow writing code that looks synchronous." JavaScript Knowledge References (text-only)
* async functions always return Promises.
* await pauses execution of the async function.
* Async/await syntax creates synchronous-looking code on top of asynchronous operations.

NEW QUESTION # 143
A test has a dependency on database .query. During the test the dependency is replace with an called database with the method, query, that returns an array. The developer needs to verify how many times the method was called and the arguments used each time.
Which two test approaches describe the requirement?

A. Black box
B. Mocking
C. White box
D. Integration

Answer: C,D

NEW QUESTION # 144
Which code statement correctly retrieves and returns an object from localStorage?

A. const retrieveFromLocalStorage = (storageKey) =>{
return JSON.parse(window.localStorage.getItem(storageKey));
}
B. const retrieveFromLocalStorage = () =>{
return JSON.stringify(window.localStorage.getItem(storageKey));
}
C. const retrieveFromLocalStorage = (storageKey) =>{
return window.localStorage[storageKey];
}
D. const retrieveFromLocalStorage = (storageKey) =>{
return window.localStorage.getItem(storageKey);
}

Answer: A

NEW QUESTION # 145
Given the JavaSript below:

Which code should replace the placeholder comment on line 05 to hide accounts that do not match the search string?

A. 'hidden'; 'visible'
B. 'Block' ; 'none'
C. 'Visible' ; hidden'
D. none' ; 'block '

Answer: B

NEW QUESTION # 146
Refer to the code below:
<html lang="en">
<table onclick="console.log(Table log');">
<tr id="row1">
<td>Click me!</td>
</tr>
<table>
<script>
function printMessage(event) {
console.log('Row log');
}
Let elem = document.getElementById('row1');
elem.addEventListener('click', printMessage, false);
</script>
</html>
Which code change should be made for the console to log only Row log when 'Click me! ' is clicked?

A. Add event.removeEventListener(); to window.onLoad event handler.
B. Add event.stopPropagation(); to printMessage function.
C. Add.event.stopPropagation(); to window.onLoad event handler.
D. Add event.removeEventListener(); toprintMessage function.

Answer: B

NEW QUESTION # 147
......

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