TypeError: Type bytes memory is not implicitly convertible to expected type string memory

remixsolidity

I was using remix for basic solidity. Can someone explain if I'm using string.concat() why is it giving that error even if both types are string.
I tried the Docs as well but it gives the same error.

from solidity:
TypeError: Type bytes memory is not implicitly convertible to expected type string memory.

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

contract test{
    function hi(string memory name) pure public returns(string memory){
        string memory greetings = string.concat("Hello", name);
        return greetings;
    }
}

Best Answer

The string.concat function was 'fixed' to take and return strings in solidity v0.8.12, so you should change the pragma solidity ^0.8.0 to pragma solidity ^0.8.12, for example:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.12;

contract test {
    function hi(string memory name) pure public returns(string memory){
        string memory greetings = string.concat("Hello", name);
        return greetings;
    }
}
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