feat: Errors

[enitrat]

In this example, we will introduce errors and how we can throw them during the execution of a contract, undoing all changes made during the transaction.

• The assert corelib function can be used to check a boolean condition and return an error message if it fails.
• The panic corelib function can be used to stop the execution of a program and return an error message.

Solidity reference: https://solidity-by-example.org/error/

[julio4]

I can take this one.