darts-domain

Darts scoring validation checks whether a thrown score is achievable on a regulation board. Valid scores account for singles (1–20), doubles (2–40), triples (3–60), and the bull (25) and outer bull (50). Use domain knowledge to reject invalid combinations like 23, which cannot be scored on any segment.

A regulation dartboard has 20 segments (1–20) arranged in fixed order, each accessible as single, double, or triple rings, plus inner bull (25) and outer bull (50). These segments and rings define all achievable scores; understanding their layout enables accurate score simulation and test generation.

Darts scoring includes edge cases: busts occur when the score exceeds the target or leaves only 1 point; checkouts require finishing on a double. Domain knowledge maps valid checkout combinations and identifies impossible states, enabling comprehensive test coverage for game logic.

Yes. Domain knowledge defines the complete scoring space—valid scores, segment mappings, and constraint rules—providing the foundation to simulate sequences of throws, validate intermediate states, and generate realistic test data for darts applications.

Unreachable scores fall outside the domain: scores below 1, above 180 (three triple-20s), or specific gaps like 23, 29, 31, 35, 37. Understanding segment anatomy and ring values identifies these impossible scores for validation and error handling.