Make Exam Preparation Simple Salesforce JavaScript-Developer-I Exam Questions

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Salesforce JavaScript-Developer-I Exam Syllabus Topics:

Section	Objectives
Asynchronous JavaScript	- Event loop and concurrency model - Error handling in async workflows - Promises and async/await
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
Salesforce Platform Integration	- Security considerations in Salesforce JavaScript - Calling Apex methods from JavaScript - Lightning Web Components (LWC) JavaScript usage
Testing and Debugging	- Debugging techniques and tools - Unit testing principles

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Valid JavaScript-Developer-I Exam Format - JavaScript-Developer-I Exam Question

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Salesforce Certified JavaScript Developer (JS-Dev-101) Sample Questions (Q50-Q55):

NEW QUESTION # 50
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.on( ' error ' , (error) = > {
console.log( ' ERROR ' , error);
});
B. try {
server.start();
} catch(error) {
console.log( ' ERROR ' , error);
}
C. server.error((error) = > {
console.log( ' ERROR ' , error);
});
D. server.catch((error) = > {
console.log( ' ERROR ' , error);
});

Answer: A

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 # 51
Which two console logs output NaN?
Choose 2 answers | |

A. console.log(10 / Number('5) ) ;
B. console.loeg(10 / 'five');
C. console.log(parseInt ' ("two')) ;
D. console.log(10 / 0);

Answer: B,C

NEW QUESTION # 52
Refer to the following code:

Which statement should be added to line 09 for the code to display. The truck 123AB has a weight of 5000 Ib. '?

A. Super.plate = plate;
B. This .plate = plate;
C. Super = (plate ) ;
D. Vehicle.plate = plate

Answer: B,C,D

NEW QUESTION # 53
Refer to the following code block:

What is the console output?

A. > Better student Jackie got 100% on test.
B. > Jackie got 70% on test.
C. > Better student Jackie got 70% on test.
D. > Uncaught Reference Error

Answer: A

NEW QUESTION # 54
A developer wants to create a simple image upload using the File API.
HTML:
< input type= " file " onchange= " previewFile() " >
< img src= " " height= " 200 " alt= " Image preview... " / >
JavaScript:
01 function previewFile() {
02 const preview = document.querySelector( ' img ' );
03 const file = document.querySelector( ' input[type=file] ' ).files[0];
04 // line 4 code
05 reader.addEventListener( " load " , () = > {
06 preview.src = reader.result;
07 }, false);
08 // line 8 code
09 }
Which code in lines 04 and 08 allows the selected local image to be displayed?

A. 04 const reader = new File();
08 if (file) reader.readAsDataURL(file);
B. 04 const reader = new FileReader();
08 if (file) URL.createObjectURL(file);
C. 04 const reader = new FileReader();
08 if (file) reader.readAsDataURL(file);

Answer: C

Explanation:
The File API in browsers provides the FileReader object to read file contents selected from < input type= " file " > .
Important knowledge points:
* new FileReader() creates a file-reading object.
* .readAsDataURL(file) reads a file and produces a Base64 URL string.
* The " load " event fires when the file has finished reading.
* reader.result contains the data URL after reading completes.
Therefore, the correct implementation must:
* Create a FileReader instance:
* const reader = new FileReader();
* Call:
* reader.readAsDataURL(file);
* Use the load event handler to assign the image preview:
* preview.src = reader.result;
Option B is the only option that matches valid JavaScript File API usage.
Option A is incorrect because File is not a constructor for reading files.
Option C is incorrect because URL.createObjectURL(file) must be assigned directly as a URL, not used with reader.result.
JavaScript Knowledge References (text-only)
* The file-reading interface in browsers is FileReader.
* readAsDataURL() loads files as Base64 data URLs.
* The load event indicates when the reader has finished and reader.result is available.

NEW QUESTION # 55
......

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