Web2.5-example-1.sol

gistfile1.txt

// SPDX-License-Identifier: UNILICENSED
pragma solidity ^0.8.24;

// TASK: Favorite number, set it and retrieve it.
// TASK: Favorite number, per owner.
// TASK: Deployer! Set anyone's number. Clear anyone's number.
// TASK: List of people and their favourite numbers.
// TASK: Get a number that is tied to a name.
// TASK: Admin can be changed.


// HOMEWORK:
// Person: name, address, age, favorite number
// Name is unique, get everything else by name.
// ARRAYS, dynamic, MAPPINGS, STRUCTS
// without loops
// BONUS:
// Admin: only admin can add people and rest


// CALLDATA

// MEMORY

error NotAdmin();

contract SimpleStorage {
    
    struct PersonNumber {
        string person;
        uint256 number;
    }

    mapping(address => uint256) public favoriteNumbers;
    mapping(string => uint256) public peopleIndex;

    address public admin;

    PersonNumber[] public listOfPeopleAndNumbers;

    event PersonNumberSet(string indexed person, uint256 number);

    modifier onlyAdmin() {
        if (msg.sender != admin) {
            revert NotAdmin();
        }
        _;
    }

    constructor() {
        admin = msg.sender;
        favoriteNumbers[admin] = 5;
    }

    function setFavoriteNumber(uint256 favoriteNumber) public {
        address guy = msg.sender;

        favoriteNumbers[guy] = favoriteNumber; 
    }

    function adminSetFavoriteNumber(address account, uint256 favoriteNumber) public onlyAdmin {    
        favoriteNumbers[account] = favoriteNumber;
    }

    function clearFavoriteNumber(address account) public onlyAdmin {

        delete favoriteNumbers[account];
    }

    function setPersonAndNumber(string calldata person, uint256 number) public {
        listOfPeopleAndNumbers.push(PersonNumber(person, number));

        emit PersonNumberSet(person, number);
    }

    function getMyNumber(string calldata name) public view returns (uint256) {
        for (uint i = 0; i < listOfPeopleAndNumbers.length; i++) 
        {
            if (keccak256(bytes(listOfPeopleAndNumbers[i].person)) == keccak256(bytes(name))) {
                return listOfPeopleAndNumbers[i].number;
            }
        }
        return 0;
    }

}