Example of using visibility in a solidity smart contract

blocksoftomorrow_visibility-example

// SPDX-License-Identifier: GPL-3.0
pragma solidity >=0.7.0 <0.9.0;

/// @title VisibiltyExample
/// @author Connor Phillips (blockchain@connorphillips.com)
/// @notice Purpose of the contract is to show how visibility works
/// @dev All function calls are currently implemented without side effects

contract VisibiltyExample {
    string greeting = "Hello World!"; // The default visibility for state variables are internal
    uint8 public randomNum = 123;
    
    /// @notice Function will be publicly accessable on the blockchain
    function publicFunc() public view returns(string memory, uint){
        return (
            greeting,
            randomNum
        );
    }
    
    /// @notice Function is not accessable on the blockchain, but accessable within the smart contract
    function privateFunc() private view returns(string memory, uint){
        return (
            greeting,
            randomNum
        );
    }
    
    /// @notice Due to use of public and accessability of private within other functions in the smart contract, privateFunc will be publicly accessable on the blockchain
    function exposedPrivateFunc() public view returns(string memory, uint){
        return privateFunc();
    }
    
    /// @notice Function is not accessable on the blockchain, but accessable within the smart contract
    function internalFunc() internal view returns(string memory, uint){
        return (
            greeting,
            randomNum
        );
    }
    
    /// @notice Due to use of public and accessability of internal within other functions in the smart contract, internalFunc will be publicly accessable on the blockchain
    function exposedInternalFunc() public view returns(string memory, uint){
        return internalFunc();
    }
    
    /// @notice Function will be publicly accessable on the blockchain
    function externalFunc() external view returns(string memory, uint){
        return (
            greeting,
            randomNum
        );
    }
}