Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=

contracts...Elementary Data Types...BoolType.sol

// SPDX-License-Identifier: GPL-3.0

pragma solidity >=0.7.0 <0.9.0;
 
contract BoolType {
    //a basic bool
    bool public aBool;
    
    function notBool() public view returns (bool) {
        return !aBool;
    }
    
    function isEqual(bool anotherBool) public view returns(bool) {
        return aBool == anotherBool;
    }
}