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Last Updated: Aug 13, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
Download Limit: Unlimited
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Average Salary for Salesforce JavaScript-Developer-I Exam Certified Professional
Salesforce JavaScript Developer roles are in great demand nowadays. The average salaries of Salesforce JavaScript Developer I exam Certified professional in:
- Europe - 63,500 Euro
- England - 60,200 POUND
- United State - 129,630 USD
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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The best study material one can get is the JavaScript-Developer-I practice exam dumps. To ensure good grades, do attempt the JavaScript-Developer-I practice exams. The JavaScript Developer I from Salesforce typically has 1-2 years of experience as a JavaScript developer with the following JavaScript topics.
Functions (more functions in higher order)
JavaScript on the backend
Scope of Variables
Modules
Discharge
Item Model Document
Monitor (agnostic platform)
Classes
Objects & Arrays: Data Structures
Strings
Asynchronous Programming
Control of Mistake
Conversion type (inclusive versus explicit)
Forms of data and operators
Activities
To prepare for this test, we advise a combination of practical experience, completion of training courses, pathways and self-study in the areas listed in the examination outline section of this examination guide.
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Salesforce JavaScript-Developer-I Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Test doubles and mocks - Unit testing concepts - Testing frameworks and assertions - Code coverage and best practices |
| Variables, Types, and Collections | 23% | - Working with strings, numbers, dates, and booleans - Variable declaration and initialization - Array methods and data manipulation - Truthy and falsy values - Type coercion and conversion rules - JSON parsing and usage |
| Objects, Functions, and Classes | 25% | - Object creation, properties, and methods - Closures and execution context - Function definitions, parameters, and scope - Modules and imports/exports - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns |
| Asynchronous Programming | 13% | - Promises and chaining - Async/await syntax - Fetch API and HTTP requests - Callbacks and callback hell - Event loop and micro/macro tasks |
| Debugging and Error Handling | 7% | - Console methods and logging - Error types and exception handling - Defensive programming practices - Debugging tools and breakpoints |
| Browsers and Events | 17% | - Script loading and execution order - Event handling, propagation, and delegation - Window and document object properties - Document Object Model (DOM) manipulation - Browser APIs and Web Storage |
| Server-Side JavaScript | 8% | - Module system and require/import - Node.js fundamentals and runtime - Command-line tools and scripts - Core Node.js modules |
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Frequently Asked Questions
What kinds of study material TopExamCollection provides?
Test Engine: JavaScript-Developer-I study test engine can be downloaded and run on your own devices. Practice the test on the interactive & simulated environment.
PDF (duplicate of the test engine): the contents are the same as the test engine, support printing.
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You will receive an email attached with the JavaScript-Developer-I study material within 5-10 minutes, and then you can instantly download it for study. If you do not get the study material after purchase, please contact us with email immediately.
How does your Testing Engine works?
Once download and installed on your PC, you can practice JavaScript-Developer-I test questions, review your questions & answers using two different options' practice exam' and 'virtual exam'.
Virtual Exam - test yourself with exam questions with a time limit.
Practice Exam - review exam questions one by one, see correct answers.
Can I get the updated JavaScript-Developer-I study material and how to get?
Yes, you will enjoy one year free update after purchase. If there is any update, our system will automatically send the updated study material to your payment email.
What's the applicable operating system of the JavaScript-Developer-I test engine?
Online Test Engine can supports Windows / Mac / Android / iOS, etc., because it is the software based on WEB browser. You can use it on any electronic device and practice with self-paced.
Online Test Engine supports offline practice, while the precondition is that you should run it with the internet at the first time.
Self Test Engine is suitable for windows operating system, running on the Java environment, and can install on multiple computers.
PDF Version: can be read under the Adobe reader, or many other free readers, including OpenOffice, Foxit Reader and Google Docs.
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All the products are updated frequently but not on a fixed date. Our professional team pays a great attention to the exam updates and they always upgrade the content accordingly.
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