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contracts...AbsenceOfNull.sol

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

import "hardhat/console.sol";

enum EmployeeType {
    Employee,
    Contractor,
    PartTime
}

struct Person {
    EmployeeType employeeType;
    bool deleted;
    string name;
    uint256 yearOfBirth;
    address walletAddress;
    uint256[] doorAccess;
}

contract AbsenceOfNull {
    Person person;

    function print() external view returns(Person memory) {
        console.log("Person:");
        console.log("  deleted", person.deleted);
        console.log("  name", person.name);
        console.log("  name lenght", bytes(person.name).length);
        console.log("  yearOfBirth", person.yearOfBirth);
        console.log("  walletAddress", person.walletAddress);

        return person;
    }

    function check() external view {
        console.log("Deleted", person.deleted == false);
        console.log("Name", bytes(person.name).length == 0);
        console.log("Year of birth", person.yearOfBirth == 0);
        console.log("Wallet address", person.walletAddress == address(0));
        console.log("Employee type", person.employeeType == EmployeeType.Employee);
        console.log("Door access", person.doorAccess.length == 0);
    }
}