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Last Updated: Aug 17, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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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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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Variables, Types, and Collections | 23% | - Truthy and falsy evaluations - Strings, numbers, and dates - Type coercion and conversion - Arrays and collections - Variable declarations and initialization - Primitive and complex data types - JSON parsing and manipulation |
| Topic 2: Objects, Functions, and Classes | 25% | - Object creation and manipulation - Arrow functions - Execution flow and context - Modules and decorators - ES6 classes and inheritance - Higher-order functions - Function declarations and expressions - Variable scope and closures - Prototypal inheritance |
| Topic 3: Browser and Events | 17% | - Interacting with forms and user input - Browser-specific APIs - Event handling and listeners - Browser Developer Tools usage - Event propagation (bubbling and capturing) - DOM manipulation |
| Topic 4: Testing | 7% | - Unit testing concepts - Test effectiveness evaluation - Writing and modifying unit tests - Test coverage and reliability |
| Topic 5: Server Side JavaScript | 8% | - Node.js fundamentals - Core Node.js modules - Server-side JavaScript implementations - CLI commands - Package management (npm) |
| Topic 6: Debugging and Error Handling | 7% | - Custom error types - Console methods for debugging - Error handling techniques (try/catch/finally) - Breakpoints and code inspection |
| Topic 7: Asynchronous Programming | 13% | - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Async/Await syntax - Callbacks - Event loop and execution flow |
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