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📜 WAYPOINT LESSON

Checkpoint: language semantics

⭐⭐⭐ advanced⏳ 12 min read📍 Lesson 161 of 265

Synthesis: predict compiler and runtime behavior across the module's traps.

Checkpoint: language semantics

Two graded challenges verify synthesis of the whole module:

  1. Classify — a pure function over integer ranges (precision first).
  2. Boxing truth — after (int)a unboxing and reassigning the local, the box must still hold 5; two boxes of the same value are distinct objects but Equals compares values.

If both pass, you can predict — not just use — value semantics. Move on to the practice set for prediction drills, then to Module 2 where these copies and boxes become measurable memory behavior.