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📜 WAYPOINT LESSON

Checkpoint: delegates and closures

⭐⭐⭐ advanced⏳ 12 min read📍 Lesson 174 of 265

Synthesis: capture semantics and allocation counts under measurement.

Checkpoint: delegates and closures

Two behaviors prove capture semantics:

  1. Per-iteration capture — n counters each remember their own index.
  2. Persistent state — one captured mutable local accumulates across calls, exactly the display-class field the compiler created.

Both together mean you can now read lambda code and predict its allocation and behavior before running it — the skill the practice set drills next.