Last Updated: Jul 29, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
Download Limit: Unlimited
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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
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Testing | 7% | - Unit testing concepts - Writing and modifying unit tests - Test coverage and reliability - Test effectiveness evaluation |
| Topic 2: Debugging and Error Handling | 7% | - Error handling techniques (try/catch/finally) - Custom error types - Console methods for debugging - Breakpoints and code inspection |
| Topic 3: Server Side JavaScript | 8% | - Node.js fundamentals - Package management (npm) - Server-side JavaScript implementations - Core Node.js modules - CLI commands |
| Topic 4: Variables, Types, and Collections | 23% | - Type coercion and conversion - Truthy and falsy evaluations - Primitive and complex data types - JSON parsing and manipulation - Variable declarations and initialization - Strings, numbers, and dates - Arrays and collections |
| Topic 5: Objects, Functions, and Classes | 25% | - Function declarations and expressions - Object creation and manipulation - Arrow functions - Higher-order functions - Execution flow and context - Prototypal inheritance - Variable scope and closures - Modules and decorators - ES6 classes and inheritance |
| Topic 6: Asynchronous Programming | 13% | - Async/Await syntax - Promises (creation, chaining, error handling) - Callbacks - Asynchronous patterns for business requirements - Event loop and execution flow |
| Topic 7: Browser and Events | 17% | - Event propagation (bubbling and capturing) - Browser-specific APIs - Interacting with forms and user input - Event handling and listeners - Browser Developer Tools usage - DOM manipulation |
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