use custom errors to save gas?

[ipatka]

https://blog.soliditylang.org/2021/04/21/custom-errors/

Basically just replace require statement with revert statements

[ameensol]

do wallets know to warn you if a tx will hit a revert? the same way they do for requires: "this transaction will result in an exception"

[ipatka]

The wallet warning seems to work and etherscan decodes the custom error ABI

Test with require

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
execution reverted: Not gonna work { "originalError": { "code": 3, "data": "0x08c379a00000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000e4e6f7420676f6e6e6120776f726b000000000000000000000000000000000000", "message": "execution reverted: Not gonna work" } }

Require: https://rinkeby.etherscan.io/tx/0xdbb38c3d988c8673a44981f0e28e7b1a24ba5a92c93569fee61f411f14ff3813

Test with revert [Custom Error]

Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
execution reverted { "originalError": { "code": 3, "data": "0xcaadeb20000000000000000000000000000000000000000000000000000000000000000a000000000000000000000000974dd52cf76a8ca06dcd7ac46dfb6866bdcbe728", "message": "execution reverted" } }

Revert: https://rinkeby.etherscan.io/tx/0x9b4f3bee59a513015463d3b3908cd2469c0934e2396baf920adfa37f19a80862

[ipatka]

[ameensol]

lgtm