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I have a very basic question - ink! now has a Mapping struct for key-value pairs. It seems it does not implement the Iterator trait?

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2 Answers 2

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There is no way to iterate over a Mapping from a contract. We intent to implement this functionality soon. For more information check out this issue: https://github.com/paritytech/substrate/issues/11410

If you try to iterate over a mapping off chain (from a UI for example) you could use the childState_getKeys RPC to list the keys of the child trie used by the contract in question.

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There are any alternatives for HashMap today Mapping that developers can use and have possibility to iterate?

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