Making the Zombie Factory

Event (event & emit) notificaiton trigger for front-end app, gas related that receving information/data without interacting to the contract

Zombies Attack Their Vicitms

mapping (address => uint) public accountBalance; | mapping (key => value) public accountBalance;

storage vs memory | hardisk vs ram

internal vs external vs public vs private

Advanced Solidity Concepts

OpenZeppelin ownable (modifier onlyOwner)

struct{ uint c; uint32 a; uint32 b;) gas < struct{ uint32 a; uint c; uint32 b;) gas

modifier end with ‘_;’ for calling the rest of the function

Zombie Battle System

• modifier
  • visibility (private, public, internal, external)
  • state (view, pure)
  • custom (onlyOwner, aboveLevel)
  • function (payable)

uint16 (2^16) 65536 uint32 (2^32)

ERC721 & Crypto-Collectibles

Token (ERC20/ERC721) just a smart contract that follows some common rules. (e.g. transferFrom(), balanceOf())