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Foundations · easy

1. Introduction to Clarity

A decidable language for Stacks.

1 min read3 questionsup to 50 XPtopic 1/50

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

Clarity is the smart contract language for the Stacks blockchain. It is interpreted and non-Turing complete, which means it forbids loops and recursion to ensure that all execution paths are finite and predictable.

clarity
(define-public (hello-world)
  (ok "Hello, Stacks!"))

This predictability is known as 'decidability', allowing developers and nodes to know the exact execution cost and outcome before broadcasting.

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 does 'decidability' mean in Clarity?

  2. 2. Is Clarity a compiled bytecode language?

  3. 3. Which feature is intentionally forbidden in Clarity?

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