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January 29, 2026 16:43
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.0; | |
| error AlreadyRegistered(); | |
| error PersonNotFound(address userAddress); | |
| contract PersonRegistry { | |
| struct Person { | |
| string name; | |
| uint256 age; | |
| bool isRegistered; | |
| } | |
| // to store a person together with unique wallet address | |
| mapping(address => Person) public people; | |
| // add a new person to the contract | |
| function addPerson(string memory _name, uint256 _age) public { | |
| if (people[msg.sender].isRegistered) { | |
| revert AlreadyRegistered(); // save more gas(money) | |
| } | |
| people[msg.sender] = Person(_name, _age, true); | |
| } | |
| // find with wallet address | |
| function getPerson(address _userAddress) public view returns (string memory, uint256) { | |
| Person memory person = people[_userAddress]; | |
| if (!person.isRegistered) { | |
| revert PersonNotFound(_userAddress); | |
| } | |
| return (person.name, person.age); | |
| } | |
| } |
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