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32. Map Insert, Set & Delete

Managing map entries safely.

1 min read2 questionsup to 50 XPtopic 32/50

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`map-insert` sets a value only if the key does not exist. `map-set` sets or updates regardless. `map-delete` removes entries.

clarity
(map-insert Balances tx-sender u100)
(map-delete Balances tx-sender)

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.

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Check your understanding

  1. 1. What does map-insert return if the key already exists?

  2. 2. Which function deletes a key from a map?

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