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31. Reflection

reflect and when to avoid it.

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The reflect package inspects and manipulates values at runtime, powering encoders and ORMs. It sacrifices type safety and speed, so prefer interfaces or generics first and confine reflection to library boundaries with strong tests.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. Reflection mainly costs…

  2. 2. Which standard package uses reflection heavily?

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