tokenByIndexi

TokenByIndexi is a term used in certain smart contracts to denote a function that returns the token identifier located at a given position within the global enumeration of all tokens. It is not part of the official ERC-721 standard, but it mirrors the common pattern found in enumerable token implementations such as those that implement the ERC-721 Enumerable extension.

In practice, a tokenByIndexi function would typically have a signature similar to function tokenByIndexi(uint256 index) public view returns (uint256). It would return the tokenId found at the specified index in the contract’s global token list, and would usually require that index is less than totalSupply() to prevent out-of-bounds access. The function relies on a storage structure that keeps an ordered collection of all token IDs, such as an array or a mapped index, which is maintained as tokens are minted, transferred, or burned.

Relationship to standard tokenByIndex: The canonical, standardized counterpart is tokenByIndex(uint256 index) in ERC-721 Enumerable. A tokenByIndexi function is typically non-standard and may simply be a naming variant or a contract-specific alias used by developers. Because it is not universally recognized, tooling, wallets, and other contracts may not automatically interact with tokenByIndexi without custom integration or documentation.

Practical considerations include ensuring correct bounds checking, maintaining the integrity of the enumeration on minting and burning, and understanding that adoption of a non-standard name can affect interoperability and future maintenance.