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📜 WAYPOINT LESSON

Checkpoint: generics

⭐⭐⭐ advanced⏳ 12 min read📍 Lesson 170 of 265

Synthesis: variance legality, static-abstract dispatch, and generic allocation reasoning.

Checkpoint: generics

One graded task verifies three ideas at once:

  1. Static abstract dispatch — the type argument supplies Area, no instance created, zero allocations.
  2. Variance legality — contravariant assignment of delegates.
  3. Generic math — one INumber<T> implementation for several numeric types.

Passing means you can design abstractions where the compiler does the runtime's work ahead of time. Next: delegates and closures — the other half of "code as data".