Function isn't returning the uint256 value after initializing mapping

Question

I'm facing a problem with the function return type in solidity. Here is my code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.17;

contract Birth {
    mapping(uint256 => bool) public isValidBirthCerti;

    function birthCertiGenerator(
        string memory _Name

    ) public returns (uint256) {
        uint256 birthCerti = uint256(
            keccak256(
                abi.encodePacked(
                    _Name
                )
            )
        ) % 100000000000000000;
        isValidBirthCerti[birthCerti] = true; //if I remove this ,then I get the returned value.
        return birthCerti;
    }
}

In the birthCertiGenerator function which returns a uint256 type value, is not returning the value if I use isValidBirthCerti[birthCerti] = true; this line. Is there anything wrong ? Or Am I missing something here?

Answer 1

If you are referring to call the birthCertiGenerator from ethers.js or web3 is normal that you don't receive the unit256 as adding isValidBirthCerti[birthCerti] = true; you are changing the state, and this your method is a transaction, not a view/pure any more.

Hope it helps