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This skill transforms Claude into a high-level JavaScript expert, offering detailed explanations and production-ready code patterns for essential language concepts. Inspired by the renowned '33-js-concepts' curriculum, it covers everything from primitive types and closures to the event loop, prototypal inheritance, and modern ES6+ features. It is an invaluable resource for developers debugging complex language behavior, refactoring code to modern functional patterns, or seeking a deeper understanding of the JavaScript engine's execution context.