'On-chain Transactions: Should Enumerable Data Structures Be For On-chain Use Only?' nft blockchain
Alternatives considered: remove the asset enumeration function if it requires a for-loop, return a Solidity array type from enumeration functions.As time moves on and more Solidity devs get their hands dirty with ERC721 and ERC1155 standards, they start paying more attention to how important immutability and on-chain data truly are.
It is becoming increasingly more common for smart contracts to loop over items in a for-loop during transactions in or at transfer time. Enumerable data structures, however, are. The use cases of data structures such as `EnumerableSet` derive from its utility when it comes to being discovered on-chain by other protocols in a “cheap” way. This means that other protocols can easily and cheaply iterate over an account’s NFTs.
If we think about an account holding a few NFTs and an iteration involving a couple of transactions , the chances of that function running out of gas will increase, even for an off-chain read.
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