Design Patterns

Design patterns here are small interactive explanations of how a piece of code behaves, not a catalog of names. Each page is a normal post on this path. The diagram is data: a scene file describes the boxes, the buttons, and the C# that should light up. The page template stays the same when a new pattern is added.

The first pattern is Observer, told as an order that notifies email, inventory, and an audit log. State and Strategy scenes already exist beside it and can become posts without a new renderer. Read Observer before treating a listener list as a design. The useful question is which consequences are notifications, and which ones the order must wait for.

• Behavioral

  Observer

  One order notifies every subscribed service, and a service that leaves the list hears nothing.

  Level: Intermediate[I]●●●

  Open explainer