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Last Updated: Sep 07, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Salesforce JavaScript-Developer-I certification is a valuable credential for developers who want to demonstrate their expertise in building custom solutions on the Salesforce platform using JavaScript. With proper preparation and study, candidates can successfully earn this certification and advance their careers in the Salesforce ecosystem.
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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Salesforce JavaScript-Developer-I日本語 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Testing | 7% | - Test doubles and mocks - Testing frameworks and assertions - Unit testing concepts - Code coverage and best practices |
| Debugging and Error Handling | 7% | - Console methods and logging - Debugging tools and breakpoints - Error types and exception handling - Defensive programming practices |
| Variables, Types, and Collections | 23% | - Truthy and falsy values - Working with strings, numbers, dates, and booleans - Type coercion and conversion rules - Array methods and data manipulation - JSON parsing and usage - Variable declaration and initialization |
| Asynchronous Programming | 13% | - Promises and chaining - Event loop and micro/macro tasks - Async/await syntax - Callbacks and callback hell - Fetch API and HTTP requests |
| Browsers and Events | 17% | - Script loading and execution order - Document Object Model (DOM) manipulation - Window and document object properties - Event handling, propagation, and delegation - Browser APIs and Web Storage |
| Objects, Functions, and Classes | 25% | - Function definitions, parameters, and scope - Class syntax, inheritance, and prototypes - Decorators and advanced function patterns - Modules and imports/exports - Closures and execution context - Object creation, properties, and methods |
| Server-Side JavaScript | 8% | - Node.js fundamentals and runtime - Core Node.js modules - Module system and require/import - Command-line tools and scripts |
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