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Foundations · easy

3. Decidability and Safety

Eliminating re-entrancy and runtime panics.

1 min read2 questionsup to 50 XPtopic 3/50

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AI translates the explanation and quiz text while preserving code and answer scoring.

By being non-Turing complete, Clarity eliminates re-entrancy attacks by design. The execution tree is static, preventing unexpected external re-invocation during state changes.

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. What classic smart contract vulnerability is impossible in Clarity by design?

  2. 2. Where is the Clarity source code stored?

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