Topic: Solidity Event (Read 149 times)

If any body passed the chapter 13 on cryptozombie, can he please elaborate regarding how we will write our final contract in cryptozombies chapter 13?
        https://cryptozombies.io/en/lesson/1/chapter/13
It says that
We want an event to let our front-end know every time a new zombie was created, so the app can display it.

Declare an event called NewZombie. It should pass zombieId (a uint), name (a string), and dna (a uint).

Modify the _createZombie function to fire the NewZombie event after adding the new Zombie to our zombies array.

You're going to need the zombie's id. array.push() returns a uint of the new length of the array - and since the first item in an array has index 0, array.push() - 1 will be the index of the zombie we just added. Store the result of zombies.push() - 1 in a uint called id, so you can use this in the NewZombie event in the next line.


Contract.sol
pragma solidity ^0.4.25;

contract ZombieFactory {

    // declare our event here

    uint dnaDigits = 16;
    uint dnaModulus = 10 ** dnaDigits;

    struct Zombie {
        string name;
        uint dna;
    }

    Zombie[] public zombies;

    function _createZombie(string _name, uint _dna) private {
        zombies.push(Zombie(_name, _dna));
        // and fire it here
    }

    function _generateRandomDna(string _str) private view returns (uint) {
        uint rand = uint(keccak256(abi.encodePacked(_str)));
        return rand % dnaModulus;
    }

    function createRandomZombie(string _name) public {
        uint randDna = _generateRandomDna(_name);
        _createZombie(_name, randDna);
    }

}

I am unable to pass this chapter as I write on line 5 (// declare our event here

event NewZombie(_zombieId, _dna, _name);
function add(_zombieId, _dna) public {
uint _name = _zombieId+_dna;


and on line 15, I modify the array like this

Zombie[] public Newzombie;

I then edit and modify function on line 17-18

 function _createZombie(string _name, uint _dna) private {
        Newzombie.push(Zombie(_name, _dna));

and on line 19 (// and fire it here

emit  _zombieId.Newzombie.push(_name, _dna) -1;
return _name;

but getting the error, can anyone please correct all my mistakes and provide the complete source?

It'll be appreciated if anyone may help

Regards