Presence of Unused Variables

Presence of Unused Variables

Although it is allowed, it is best practice to avoid unused variables. Unused variables can lead to a few different problems:

• Increase in computations (unnecessary gas consumption)
• Indication of vulnerabilities or malformed data structures
• Decreased code readability

It is highly recommended to remove all unused variables from a code base.

Sources

https://github.com/kadenzipfel/smart-contract-vulnerabilities/blob/master/vulnerabilities/unused-variables.md

https://swcregistry.io/docs/SWC-131

https://ethereum/solidity#718

https://ethereum/solidity#2563