pragma solidity ^0.4.18; contract ZombieFactory { 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)); } function _generateRandomDna(string _str) private view returns (uint) { uint rand = uint(keccak256(_str)); return rand % dnaModulus; } } 0.4.18