Developer Replaces 17 Redundant Functions With One Declarative Pattern Engine

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A developer building IUPACker, a tool that converts chemical SMILES strings into IUPAC names, initially wrote a separate 20-30 line function for each of the 17 functional groups it needed to detect. Recognizing the approach was unsustainable and full of repetitive boilerplate, the developer shifted to a declarative pattern system where each functional group is defined as structured data rather than procedural code. A single generic matching engine now handles all pattern recognition by walking the molecular graph and checking bond requirements and atom conditions against these definitions. The refactor reduced adding a new functional group from roughly 30 lines of copied code to around 10 lines of a clean pattern definition. The change improved readability, maintainability, and scalability of the IUPACker codebase significantly.

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