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Exam Code: JavaScript-Developer-I
Exam Name: Salesforce Certified JavaScript Developer (JS-Dev-101)
Updated: Sep 08, 2026
Q & A: 149 Questions and Answers
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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| Section | Weight | Objectives |
|---|---|---|
| Asynchronous Programming | 13% | - Event loop and execution flow - Callbacks - Promises (creation, chaining, error handling) - Asynchronous patterns for business requirements - Async/Await syntax |
| Testing | 7% | - Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability - Unit testing concepts |
| Browser and Events | 17% | - Interacting with forms and user input - Event propagation (bubbling and capturing) - DOM manipulation - Event handling and listeners - Browser Developer Tools usage - Browser-specific APIs |
| Objects, Functions, and Classes | 25% | - Higher-order functions - Prototypal inheritance - Modules and decorators - Execution flow and context - Arrow functions - Object creation and manipulation - Function declarations and expressions - Variable scope and closures - ES6 classes and inheritance |
| Server Side JavaScript | 8% | - Node.js fundamentals - Server-side JavaScript implementations - CLI commands - Core Node.js modules - Package management (npm) |
| Variables, Types, and Collections | 23% | - Arrays and collections - Strings, numbers, and dates - Variable declarations and initialization - Type coercion and conversion - Primitive and complex data types - Truthy and falsy evaluations - JSON parsing and manipulation |
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Console methods for debugging - Error handling techniques (try/catch/finally) - Custom error types |
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