* **Code Quality:** Simple, functional JavaScript; lacks error handling and input validation. Theme switching logic is repetitive. * **Language Features:** Uses basic JavaScript; no modern features like async/await or arrow functions. Inefficient theme switching. * **Structure:** Poorly structured; `checkBox` isn't consistently defined; functions could be combined for better readability. * **Improvements:** Refactor `loadTheme` to avoid repetition; add input validation; use `const` and `let` for clarity; implement proper error handling. Consider a dedicated theme management library.
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