Error handling

・Assert 👉 to test for internal errors & to check constant value

Error of type Panic(uint256)

・Require👉to ensure valid conditions that cannot be detected until execution time.

This includes conditions on inputs or return values from calls to external contracts.

An Error(string)

Expressions and Control Structures - Solidity 0.8.13 documentation

An error will undo all changes made to the state during a transaction.

You can throw an error by calling require, revert or assert.

• require is used to validate inputs and conditions before execution.
• revert is similar to require. See the code below for details. It has no condtions
• assert is used to check for code that should never be false. Failing assertion probably means that there is a bug.