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Last Updated: Jul 25, 2026
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How to Prepare for Salesforce JavaScript Developer I Exam
Preparation Guide for Salesforce JavaScript Developer I Exam
Introduction
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Objects, Functions, and Classes | 25% | - Arrow functions - Function declarations and expressions - Object creation and manipulation - Prototypal inheritance - Modules and decorators - Higher-order functions - Execution flow and context - ES6 classes and inheritance - Variable scope and closures |
| Topic 2: Server Side JavaScript | 8% | - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - CLI commands - Package management (npm) |
| Topic 3: Variables, Types, and Collections | 23% | - Truthy and falsy evaluations - Primitive and complex data types - Arrays and collections - Strings, numbers, and dates - Type coercion and conversion - Variable declarations and initialization - JSON parsing and manipulation |
| Topic 4: Testing | 7% | - Test coverage and reliability - Writing and modifying unit tests - Unit testing concepts - Test effectiveness evaluation |
| Topic 5: Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types |
| Topic 6: Asynchronous Programming | 13% | - Async/Await syntax - Callbacks - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Event loop and execution flow |
| Topic 7: Browser and Events | 17% | - Browser-specific APIs - Browser Developer Tools usage - Event propagation (bubbling and capturing) - Event handling and listeners - Interacting with forms and user input - DOM manipulation |
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