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Created April 7, 2022 17:55
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at
//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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