将更新和删除功能添加到固体结构

Question

我正在尝试将更新功能和删除功能添加到我的结构中，但是它不起作用。

有人知道如何使这些功能起作用吗？

pragma solidity 0.7.5;

contract dogs{

    struct Person{
        uint age;
        string name;
    }
    Person[]people;
    function addNewPerson(uint _age, string memory _name)public {
        Person memory newPerson = Person(_age, _name);
        people.push(newPerson);

    }
    function getPerson(uint _index)public view returns(uint, string memory){
        Person memory personToReturn = people[_index];
        return(personToReturn.age, personToReturn.name);
    }
// to replace and old person with a knew person

    function update(uint _index) public view returns(uint, string memory){
        Person memory updatePerson = people[_index];
    return(updatePerson.age, updatePerson.name);
    }
// delete button for indexs

    function destory(uint _index)public{
        delete people[_index];

    }
}

Answer 1

尝试下面的智能合约，我还插入了一些评论，以了解您的合同中的错误：

// SPDX-License-Identifier: MIT
pragma solidity 0.7.5;

contract Dogs {

    struct Person{
        uint age;
        string name;
    }

    Person[] people;

    function addNewPerson(uint _age, string memory _name)public {
        Person memory newPerson = Person(_age, _name);
        people.push(newPerson);
    }

    function getPerson(uint _index)public view returns(uint, string memory){
        Person memory personToReturn = people[_index];
        return(personToReturn.age, personToReturn.name);
    }

    // to replace and old person with a knew person
    function update(uint _index, uint _newAge, string memory _newName) public returns(uint, string memory) {
        Person memory updatePerson = people[_index];
        updatePerson.age = _newAge;
        updatePerson.name = _newName;
        // You can replace the old person at specific index to a new person.
        // You can do it, using the statement declared below this line  
        people[_index] = updatePerson;
        return(updatePerson.age, updatePerson.name);
    }
    
    // delete button for indexs
    function destory(uint _index) public {
        delete people[_index];
    }
}

如果您执行 delete> delete 函数，请从煤气中收到错误，请记住增加气体限制。
关注addNewperson功能，它起作用。