These patterns deal with object composition and typically help ensure that if one part of a system changes, the entire system doesn't need to change.

At this point you must decide which and how many segments to target. To begin, consider various possible “coverage patterns.” These patterns are simply the ways a firm might choose and ultimately ...

Feature Envy / Shotgun Surgery -> Moved pricing and discount logic out into PricingService, so changes in tax or discount now occur in one place. Global / Static State -> Removed static fields ...