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SimpleStorage.sol

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

contract SimpleStorage {
    // Basic Types: boolean, unit, int, address, bytes
    // bool hasFavoriteNumber = true;
    // uint256 favoriteNumber = 88;
    // string favoriteNumberInText = "eighty-eight";
    // int256 favoriteInt = -88;
    // address myAddress = 0x687Ff6d6a2D149f6475b83BaEC087067b62BE9E8;
    // bytes32 favoriteBytes32 = "cat";

    uint256 myFavoriteNumber; // 0

    // uint256[] listOfFavoriteNumbers;

    struct Person {
        uint256 favoriteNumber;
        string name;
    }

    // Person public pat = Person({favoriteNumber: 7, name: "Pat"});
    Person[] public listOfPeople; // []

    mapping(string => uint256) public nameToFavoriteNumber;

    function store(uint256 _favoriteNumber) public {
        myFavoriteNumber = _favoriteNumber;
    }

    // view -  means read state
    function retrieve() public view returns(uint256) {
        return myFavoriteNumber;
    }

    function addPerson(string memory _name, uint256 _favoriteNumber) public {
        listOfPeople.push(Person(_favoriteNumber, _name));
        nameToFavoriteNumber[_name] = _favoriteNumber;
    }
}