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Last Updated: Sep 04, 2026
No. of Questions: 149 Questions & Answers with Testing Engine
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With the introduction of the Lightning Experience by Salesforce, it is possible to develop cool, looking applications for a wide range of tasks. Admins have been able to create beautiful pages for their objects more than ever, with an interface entirely tailored for each user.For developers, the same application has never before been possible for Salesforce developers to create applications that stretch well beyond Salesforce's declarative features. It's all achieved with the use of a JavaScript application for Lightning & Lightning Web components.
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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Reference: https://trailheadacademy.salesforce.com/certificate/exam-javascript-dev---JS-Dev-101
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| Section | Weight | Objectives |
|---|---|---|
| Objects, Functions, and Classes | 25% | - Function declarations and expressions - Higher-order functions - Modules and decorators - Arrow functions - Object creation and manipulation - Execution flow and context - ES6 classes and inheritance - Prototypal inheritance - Variable scope and closures |
| Browser and Events | 17% | - Event handling and listeners - Interacting with forms and user input - DOM manipulation - Event propagation (bubbling and capturing) - Browser Developer Tools usage - Browser-specific APIs |
| Server Side JavaScript | 8% | - Node.js fundamentals - Server-side JavaScript implementations - Core Node.js modules - Package management (npm) - CLI commands |
| Debugging and Error Handling | 7% | - Breakpoints and code inspection - Custom error types - Error handling techniques (try/catch/finally) - Console methods for debugging |
| Asynchronous Programming | 13% | - Callbacks - Async/Await syntax - Asynchronous patterns for business requirements - Promises (creation, chaining, error handling) - Event loop and execution flow |
| Testing | 7% | - Writing and modifying unit tests - Test effectiveness evaluation - Test coverage and reliability - Unit testing concepts |
| Variables, Types, and Collections | 23% | - Type coercion and conversion - Arrays and collections - Truthy and falsy evaluations - JSON parsing and manipulation - Primitive and complex data types - Strings, numbers, and dates - Variable declarations and initialization |
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