Pass the actual test with the help of JavaScript-Developer-I日本語 study guide
Last Updated: Aug 10, 2026
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The certification for JavaScript Developer I has just been released and fills a large gap in the certification list for Salesforce. Salesforce Developers who want to prove their Lightning skills, but also new entrants into the Salesforce community, are certified to demonstrate that they know what is relevant. A typical Salesforce 60 multi-choice test is split into two parts and is influenced by a super badge (Similar to Developer II certification).
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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.
Discharge
Functions (more functions in higher order)
Control of Mistake
Scope of Variables
Monitor (agnostic platform)
Objects & Arrays: Data Structures
Classes
Asynchronous Programming
JavaScript on the backend
Strings
Forms of data and operators
Activities
Modules
Conversion type (inclusive versus explicit)
Item Model Document
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.
Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Function declarations and expressions - Prototypal inheritance - Variable scope and closures - Object creation and manipulation - Arrow functions - ES6 classes and inheritance - Execution flow and context - Modules and decorators - Higher-order functions |
| Variables, Types, and Collections | 23% | - Type coercion and conversion - Variable declarations and initialization - Strings, numbers, and dates - Truthy and falsy evaluations - JSON parsing and manipulation - Arrays and collections - Primitive and complex data types |
| Asynchronous Programming | 13% | - Callbacks - Async/Await syntax - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Event loop and execution flow |
| Testing | 7% | - Test coverage and reliability - Unit testing concepts - Test effectiveness evaluation - Writing and modifying unit tests |
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Custom error types - Error handling techniques (try/catch/finally) |
| Browser and Events | 17% | - Interacting with forms and user input - Event handling and listeners - Event propagation (bubbling and capturing) - Browser Developer Tools usage - DOM manipulation - Browser-specific APIs |
| Server Side JavaScript | 8% | - Core Node.js modules - CLI commands - Package management (npm) - Node.js fundamentals - Server-side JavaScript implementations |
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