Mapping.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.10;

contract Mapping {
    mapping (address => uint) public myMap;

    function get(address _addr) public view returns(uint) {
        return myMap[_addr];
    }

    function set(address _addr, uint i) public {
        myMap[_addr] = i;
    }

    function remove(address _addr) public {
        delete myMap[_addr];
    }
}
 contract NestedMapping {
     mapping (address => mapping(uint => bool)) public nested;

     function get(address _addr1, uint _i) public view returns(bool) {
         return nested[_addr1][_i];
     }

     function set(address _addr1, uint _i, bool _boo) public {
         nested[_addr1][_i] = _boo;
     }

     function remove(address _addr1, uint _i) public {
         delete nested[_addr1] [_i];
     }
 }