How to hash an address?

Question

I just want to hash the senders' address

    function myHash() public returns(string memory){
        return(keccak256(abi.encodePacked(msg.sender)));
    }

but no matter what I do I get the following error

TypeError: Return argument type bytes32 is not implicitly convertible to expected type (type of first return variable) string memory.

Is there any way to just hash the address?

Answer 1

Your return type (bytes32) doesn't match the declared return type (string).

Just change your function declaration for :

function hashSenderAddress() public view returns (bytes32) {
    return(keccak256(abi.encodePacked(msg.sender)));
}

A hash is not really a string, it's basically a 32 bytes number (for keccak256 at least). Any "string" representation of it are just hexadecimal formatting, but it's still a number being represented.