"Quick" Start

Environment variables

First things first, create a file called .env. It will look something like this.

PORT=3000
MODE="development"
LOCAL_NODE="http://localhost:7545"
REMOTE_NODE="https://rinkeby.infura.io/v3/<SOME ID>"
MNEMONIC = "blah blah blah blah"

LOCAL_NODE is the address of a local blockchain you're going to run.

REMOTE_NODE refers to the one you're going to deploy to remotely. Probably a test network, the main Ethereum net is probably too expensive to make this deploy worthwhile. You can get an endpoint to deploy from via https://infura.io/register.

The MNEMONIC is the mnemonic for accessing the wallet you'll use to pay the gas for deploying the contract on a remote node like Rinkeby. Make sure that wallet has enough ETH in it.

Deploy to a local blockchain

1. Install Ganache
2. Start Ganache and do "Quickstart"
3. Run npm start
4. Run truffle migrate in this directory
5. You should see two mirations. The one called 1609276627_conways_game_of_life should have a contract address: - copy down the value somewhere.

Deploy to rinkeby

1. Run truffle migrate --network rinkeby
2. You should see two mirations. The one called 1609276627_conways_game_of_life should have a contract address: - copy down the value somewhere.

Start the web app

npm install

Then in one shell run npm start and npm run webpack in another.

Go to http://localhost:3000 and you should see the board.

Get onto the console

1. Go to truffle develop/truffle console --network rinkeby

let instance = await ConwaysGameOfLife.deployed()
let accounts = await web3.eth.getAccounts()
// Set this to whatever the contract address from `migrate` was
let contractAddress = '0x0aAd3D96a59806f9FE651Ab4a52E8F82b934DE45'

// Let's send the contract some ETH
await web3.eth.sendTransaction({to: contractAddress, from: accounts[0], value: 1000000000000000, gas: 300722130000})

// This should show you what the world currently looks like
instance.getWorld()
instance.world.call()

// Make sure it has some ETH to pay the gas costs of `getWorld`
web3.eth.getBalance(contractAddress)

// Make sure the address we are using has ETH
web3.eth.getBalance(accounts[0])

// Send the exact right amount to step the world, and make sure the gas price is high enough
web3.eth.sendTransaction({to: contractAddress, from: accounts[0], value: 10000000000000, gas: 3000000})

// Check the world again
instance.getWorld()

Optimisation

V0.0.2

• Changed optimise for solc to 200 runs
• Using uint8 for numLiveNeighbours
• Worldlength up top

Typical Gas Price: 402278 somehow higher 🤔

V0.0.1

Typical Gas Price: 276482