Enums.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract Enum {
    enum Status {
        Done,
        AlmostDone,
        Failed
    }

    Status public status = Status.AlmostDone;

    function setStatus() public {
        status = Status.Failed;
    }

    function set(Status _index) external returns (Status) {
        return status = _index;
    }

    function reset() external {
        delete status;
    }
}