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Create a JavaScript-based search function that includes an autocomplete feature to improve user experience. The function should efficiently filter results as users type, providing instant suggestions from a predefined list of keywords. Ensure the code is modular, well-commented, and optimized for performance. Include error handling and customizable options for easy integration into different web applications.
An AI-powered prompt to implement a search function with autocomplete in JavaScript can drastically enhance user experience by making searches faster, smarter, and more intuitive.