PushingStructIntoArray.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract StructArrayExample {
    struct Person {
        string name;
        uint age;
    }

    Person[] public people;

    // Pushing a struct into the array
    function addPerson(string memory _name, uint _age) public {
        Person memory newPerson = Person(_name, _age);
        people.push(newPerson);
    }

    // Creating a struct and pushing it immediately into the array
    function addPersonImmediately(string memory _name, uint _age) public {
        people.push(Person(_name, _age));
    }

    // Updating the array by modifying an existing struct
    function updatePerson(uint _index, string memory _name, uint _age) public {
        require(_index < people.length, "Invalid index");
        Person storage person = people[_index];
        person.name = _name;
        person.age = _age;
    }

    // Modifying the array directly by index
    function modifyPerson(uint _index, string memory _newName) public {
        require(_index < people.length, "Invalid index");
        people[_index].name = _newName;
    }

    // Deleting a struct in the array to reset it
    function deletePerson(uint _index) public {
        require(_index < people.length, "Invalid index");

        // Move the last element to the deleted element's position
        people[_index] = people[people.length - 1];

        // Remove the last element (pop)
        people.pop();
    }
}