Developer Uses Polymorphism to Keep Cyclomatic Complexity Constant in Shape Puzzle

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A developer refactored a programming puzzle solution using a TypeScript interface-based abstraction for shapes, replacing conditional color-checking logic with polymorphism. The approach centers on a Shape interface with methods for movement, blocking, and interaction, implemented by individual shape classes. By inverting dependencies correctly, the solution keeps cyclomatic complexity at O(1) regardless of how many shape types are added. The author argued that a configurable in-memory list is viable when the design relies on polymorphism rather than hard-coded conditionals. The post concludes that the exercise highlights the difference between code that merely works and code that scales.

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