I want to encode and store the address variable and the uint256 variable

Question

I am currently using it as follows.

bytes memory _byte = abi.encode(ca, tokenId);

I learned that this method can take different variables and produce the same results.

If I use the keccak256 function, I can prevent it, but I can't decode it.

Is there a way to have a unique value by encoding and decoding variables without using keccak256?

Answer 1

Here you go...

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

contract EncodeVars {

    bytes public _bytes;

    function encodeVars(address _addr, uint _num) external returns (bytes memory) {
        _bytes = abi.encode(_addr, _num);
        return _bytes;
    }

    function decodeVars() external view returns (address _addr, uint _num) {
        (_addr, _num) = abi.decode(_bytes, (address, uint));
    }

}

You're right not to use keccak256 as yes, that would give you a hash of the values.

Let me know if this answers your question.