amacgregor

<?php 
 
class StockItem {
  
  private $quantity;
  private $status;
  
  public function __construct($quantity, $status){
   $this->quantity = $quantity;
   $this->status   = $status;

amacgregor

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

amacgregor

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?

• They are the people who get things done. Effective Engineers produce results.

Adopt the Right Mindsets

amacgregor

pragma solidity ^0.4.18;

contract HeroToken {
    /* This creates an array with all balances */
    mapping (address => uint256) public balanceOf;

    /* Initializes contract with initial supply tokens to the creator of the contract */
    function HeroToken(
        uint256 initialSupply
        ) public {

amacgregor

// https://github.com/ethereum/EIPs/issues/20
contract ERC20 {
 function totalSupply() constant returns (uint totalSupply);
 function balanceOf(address _owner) constant returns (uint balance);
 function transfer(address _to, uint _value) returns (bool success);
 function transferFrom(address _from, address _to, uint _value) returns (bool success);
 function approve(address _spender, uint _value) returns (bool success);
 function allowance(address _owner, address _spender) constant returns (uint remaining);
 event Transfer(address indexed _from, address indexed _to, uint _value);
 event Approval(address indexed _owner, address indexed _spender, uint _value);

amacgregor

Geth
Version: 1.7.3-stable
Architecture: amd64
Protocol Versions: [63 62]
Network Id: 1
Go Version: go1.9.2
Operating System: darwin
GOPATH=
GOROOT=/usr/local/Cellar/go/1.9.2/libexec

amacgregor

{
    "config": {
        "chainId": 24,
        "homesteadBlock": 0,
        "eip155Block": 0,
        "eip158Block": 0
    },
    "nonce": "0x0000000000000042",     
    "timestamp": "0x0",
    "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",

amacgregor

WARN [12-22|15:32:55] No etherbase set and no accounts found as default
INFO [12-22|15:32:55] Allocated cache and file handles         database=/Users/.../ethereum_0hero/TestNetData/geth/chaindata cache=16 handles=16
INFO [12-22|15:32:55] Writing custom genesis block
INFO [12-22|15:32:55] Successfully wrote genesis state         database=chaindata                                                                 hash=6231b0…a0300b
INFO [12-22|15:32:55] Allocated cache and file handles         database=/Users/.../ethereum_0hero/TestNetData/geth/lightchaindata cache=16 handles=16
INFO [12-22|15:32:55] Writing custom genesis block
INFO [12-22|15:32:55] Successfully wrote genesis state         database=lightchaindata                                                                 hash=6231b0…a0300b

amacgregor

WARN [12-22|16:10:27] No etherbase set and no accounts found as default
INFO [12-22|16:10:27] Starting peer-to-peer node               instance=Geth/HeroNode1/v1.7.3-stable/darwin-amd64/go1.9.2
INFO [12-22|16:10:27] Allocated cache and file handles         database=/Users/.../ethereum_0hero/TestNetData/geth/chaindata cache=128 handles=1024
INFO [12-22|16:10:27] Initialised chain configuration          config="{ChainID: 24 Homestead: 0 DAO: <nil> DAOSupport: false EIP150: <nil> EIP155: 0 EIP158: 0 Byzantium: <nil> Engine: unknown}"
INFO [12-22|16:10:27] Disk storage enabled for ethash caches   dir=/Users/.../ethereum_0hero/TestNetData/geth/ethash count=3
INFO [12-22|16:10:27] Disk storage enabled for ethash DAGs     dir=/Users/.../.ethash                                              count=2
INFO [12-22|16:10:27] Initialising Ethereum protocol           versions="[63 62]" network=24
INFO [12-22|16:10:27] Loaded most recent local header          number=0 hash=6231b0…a0300b td=1024
INFO [12-22|16:10:27] Loaded mo

amacgregor

INFO [12-22|17:07:55] Updated mining threads                   threads=0
INFO [12-22|17:07:55] Transaction pool price threshold updated price=18000000000
INFO [12-22|17:07:55] Starting mining operation
INFO [12-22|17:07:55] Commit new mining work                   number=1 txs=0 uncles=0 elapsed=981.307µs
INFO [12-22|17:07:57] Generating DAG in progress               epoch=0 percentage=0 elapsed=577.592ms
INFO [12-22|17:07:57] Generating DAG in progress               epoch=0 percentage=1 elapsed=1.168s
INFO [12-22|17:07:58] Generating DAG in progress               epoch=0 percentage=2 elapsed=1.985s
INFO [12-22|17:07:59] Generating DAG in progress               epoch=0 percentage=3 elapsed=2.586s