Salesforce JavaScript-Developer-I Related Exams | New JavaScript-Developer-I Test Registration

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

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

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q124-Q129):

NEW QUESTION # 124
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 messageInner message
B. Inner message
C. Inner messageOuter message
D. Outer message

Answer: B

NEW QUESTION # 125
Given two expressions var1 and var2. What are two valid ways to return the logical AND of the two expressions and ensure it is data type Boolean ?
Choose 2 answers:

A. Boolean(var1) && Boolean(var2)
B. var1.toBoolean() && var2toBoolean()
C. var1 && var2
D. Boolean(var1 && var2)

Answer: A,D

NEW QUESTION # 126
Which statement accurately describes an aspect of promises?

A. .then() cannot be added after a catch.
B. Arguments for the callback function passed to .then() are optional.
C. In a.then() function, returning results is not necessary since callbacks will catch the result of a previous promise.
D. .then() manipulates and returns the original promise.

Answer: B

NEW QUESTION # 127
A developer creates a new web server that uses Node.js. It imports a server library that uses events and callbacks for handling server functionality. The server library is imported with require and is made available to the code by a variable named server. The developer wants to log any issues that the server has while booting up.
Which code logs an error at boot time with an event?

A. server.catch((error) = > {
console.log( ' ERROR ' , error);
});
B. server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});
C. server.error((error) = > {
console.log( ' ERROR ' , error);
});
D. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
}

Answer: B

Explanation:
* Event-driven Node-style APIs expose events via .on(eventName, handler).
* To listen for error events:
server.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});
* A and B assume methods .error or .catch that don't exist on typical event emitters.
* C only catches synchronous errors from server.start(), not async event-based errors.

NEW QUESTION # 128
Refer to the code below:
new Promise((resolve, reject) => {
const fraction = Math.random();
if( fraction >0.5) reject("fraction > 0.5, " + fraction);
resolve(fraction);
})
.then(() =>console.log("resolved"))
.catch((error) => console.error(error))
.finally(() => console.log(" when am I called?"));

When does Promise.finally on line 08 get called?

A. When resolved or rejected
B. WHen resolved
C. When resolved and settled
D. When rejected

Answer: A

NEW QUESTION # 129
......

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