_name

_favoriteNumber

addPerson

listOfPeople

favoriteNumber

name

nameToFavoriteNumber

retrieve

store

// I'm a comment!
// SPDX-License-Identifier: MIT

pragma solidity 0.8.19;

// pragma solidity ^0.8.0;
// pragma solidity >=0.8.0 <0.9.0;

contract SimpleStorage {
    uint256 myFavoriteNumber;

    struct Person {
        uint256 favoriteNumber;
        string name;
    }
    // uint256[] public anArray;
    Person[] public listOfPeople;

    mapping(string => uint256) public nameToFavoriteNumber;

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

    function retrieve() public view returns (uint256) {
        return myFavoriteNumber;
    }

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


This Solidity contract, SimpleStorage, allows storing and retrieving a single number, and adding people with a name and favorite number to a list. It also maps names to favorite numbers for quick lookup.