<ul><li>Solidity introduced custom errors in version 0.8.4 to optimize gas and improve error message readability.</li><li>Custom errors reduce gas consumption and allow for structured errors with parameters, making debugging easier.</li><li>Using a custom error can save gas costs significantly compared to using require with a string error message.</li><li>Custom errors are defined using the error keyword at the contract level and can be accessed through the transaction's revert reason.</li></ul>

A Walkthrough of Solidity Custom Errors

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