Salesforce JavaScript Developer + Explanations (Updated - Su 26 - Sep 26)

This exam course covers all the topics/areas/information that will boost your chances to pass the exam on your first try!

Course Features:
Up-to-date Content: These Practice tests are updated as of Sep 2026 (SU'26), aligning with the latest exam objectives and industry trends.
Detailed/thorough Explanation: Each scenario includes an in-depth explanation and step-by-step instructions to replicate the scenario at Trailhead Playground.
Accurate scenarios: Instead of covering unnecessary or vague questions that will not be helpful for the exam as well as for the subject understanding, this course contains to-the-point scenarios. So, the learner can achieve the goal and increase their knowledge without wasting time in redundant scenarios.
Sense of Achievement: When you read/understand the explanation and make your hands dirty with Trailhead Playground, you will get the sense of satisfaction that you will not only be able to clear the exam, but you have gained the knowledge and insights of the topic.
Appropriate for all levels: Whether you are just starting with the Salesforce platform or a seasoned person, these practice tests cater to your specific needs. Scenarios will reflect real-world challenges.
Refund policy: This course comes with a Review N Prep refund policy. So, in case... in case it doesn’t suit your requirements, you can leverage the Review N Prep refund policy.
To practically try out things on Trailhead Playground please follow the "Java Script certification trail mix".
https://trailhead.salesforce.com/en/users/strailhead/trailmixes/prepare-for-your-salesforce-javascript-developer-i-credential

To begin working on a Trailhead Playground please follow "Setup trailhead playground".
https://trailhead.salesforce.com/content/learn/modules/trailhead_playground_management

Are you ready to pass the Salesforce Certified Java Script Developer ?
Find out by testing yourself with this popular offering on ReviewNPrep.
Both of these two practice tests in this set provide an entire subject matter understanding.

I highly recommend reading the explanations provided after each practice test, not only for the correct choices but also for the incorrect ones.
This will help improve your understanding of this feature-rich platform and increase your exam score dramatically.
By paying attention to these and repeating all the tests until you get 90% or more on each one, you should be able to ace the real exam with confidence.

The Salesforce Certified Java Script Developer validates an examinee's ability to:

JavaScript Basics
Data Types and Variables
Type Conversion (explicit and implicit)
Collections
Working with Strings, Numbers, and Dates
Working with JSON

Objects, Functions, and Classes
Creating Objects
Defining Functions
Object Prototypes
Declaring Classes
Using JavaScript Modules

Browser and Events
Document Object Model
DOM Events
Browser Dev Tools

Debugging and Error Handling
Throwing and Catching Errors
Working with the Console

Asynchronous Programming
Callback Functions
Promises
Async/Await

Server Side JavaScript
Node.js CLI
Node.js Libraries
Debugging in Node.js
npm

Testing
Assertions
Types of Testing