Solidity completed Errors and Checks

## Part 8

errors and checks

### Part 8 video link

<https://www.youtube.com/watch?v=P1J0HeQINcM&list=PLvfQp12V0hS2PQd9-X-E2AjmXj1o05WOo&index=8>

### Part 8 related .sol files

- [MyErrorsAndChecks.sol](./contracts/MyErrorsAndChecks.sol)

### Part 8 notes

- covers `require()`, `revert()`, `assert`

## Part 9

### Part 9 video link

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

contract MyErrorsAndChecks {

    uint256 public maxAmount = 100;

    function updateMax() public {

        maxAmount = 50;

    }

    function myFunc(uint256 _x, uint256 _y) public view returns (uint256 xy) {

        require(_x > _y, "_x must be greater than _y."); // only if this is true, then the rest of the code will execute

        checkMax();

        return _x + _y;

    }

    function myPureRevertFunc(uint256 _x, uint256 _y) public pure returns (uint256 xy) {

        // logic

        if (_x == 10) {

            revert("_x should NEVER be 10.");

        }

        return _x + _y;

    }

    function checkMax() internal view {

        assert(maxAmount == 100);

    }

}