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contracts...CustomError.sol

// SPDX-License-Identifier: MIT

pragma solidity 0.8.21;


contract NumberGame {

    error ToLowerThanFrom(uint256 from, uint256 to);

    error NumberTooHigh(uint256 from, uint256 number);
    error NumberToLow(uint256 to, uint256 number);

    uint256 private from;
    uint256 private to;

    constructor(uint256 _from, uint256 _to) {
        if(_to < _from) {
            revert ToLowerThanFrom(_from, _to);
        }

        from = _from;
        to = _to;
    }

    function guess(uint256 number) external view returns(bool) {
        if (number < from) {
            revert NumberToLow(from, number);
        } else if (number > to)
            revert NumberTooHigh(to, number);
        else {
            return true;
        }
    }

}