no_compiler_error.sol

//SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0; // 限定 compiler version 在某一個區間較好

contract donation {
    
    // Data
    struct donorinfo {
        address[] donors;
        mapping(address=> uint) ledger;
    }
    
    mapping(address=>donorinfo) donationHistory;
    
    // Events
    event LogDonate (
        address youtuber, 
        address donor, 
        string nickname, 
        uint value, 
        string message
    );
    
    event loglistdonorinfo (
        address _youtube, 
        address user, 
        uint value
    );

    // Functions
    function donate(address payable _youtuber,string memory _nickname, string memory _message) public payable {
        
        require(msg.value > 0);
        _youtuber.transfer(msg.value);
        
        if(donationHistory[_youtuber].ledger[msg.sender]==0){
            //donationHistory[_youtuber].ledger[msg.sender] += msg.value;
            donationHistory[_youtuber].donors.push(msg.sender);
        }
        
        donationHistory[_youtuber].ledger[msg.sender] += msg.value;

        /* 我不太確定這邊是要幹嘛，所以先註解掉
        else{
            donationHistory[_youtuber].ledger[msg.sender] += msg.value;
        }///19到25重複效用程式碼
        */

        emit LogDonate(_youtuber, msg.sender, _nickname, msg.value, _message);
    }

    function getdonorList() public view returns(address[] memory) {
        return donationHistory[msg.sender].donors;
    }

    function listdonorinfo() public {
        uint array_length = donationHistory[msg.sender].donors.length;

        for(uint i = 0; i <= array_length; i++) {
            address user = donationHistory[msg.sender].donors[i];
            emit loglistdonorinfo(msg.sender, user, donationHistory[msg.sender].ledger[user]);
        }
    }
}