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April 7, 2022 17:55
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//SPDX-License-Identifier: Unlicense | |
pragma solidity ^0.8.0; | |
contract Mappings { | |
mapping(address => uint256) private luckyNumbers; | |
function getMyLuckyNumber() external view returns(uint256) { | |
require(luckyNumbers[msg.sender] != 0, "0 can't be lucky"); | |
return luckyNumbers[msg.sender]; | |
} | |
function setMyLuckyNumber(uint256 number) external { | |
require(number > 0, "Can't be set to zero"); | |
luckyNumbers[msg.sender] = number; | |
} | |
} |
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