ether.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.3;

//3 ways to send eth
//transfer - 2300 gas, reverts
//send - 2300 gas, returns bool
// call - all gas, returns bool and data

contract Sendether {
    constructor() payable{}
    receive() external payable{}
    
    function sendViaTransfer(address payable _to) external payable{
        _to.transfer(123);
    }
    function sendViaSend(address payable _to) external payable{
        bool sent = _to.send(123);
        require(sent==true, "Send failure");
    }
    function sendViaCall(address payable _to) external payable{
        (bool success, ) = _to.call{value: 123}("");
        require(success, "call failure");
    }
}

contract EthReceiver{
    event Log(uint amount, uint gas);

    receive() external payable {
        emit Log(msg.value, gasleft());
    }
}