web3-training

This project is to keep track of my journey of learning web3. includes:

• Smart contract with Solitidy
• Deploy smart contract to local net with hardhat
• Deploy smart contract to test net(rinkeby, goerli)
• Lint & unit test

environment

• nodejs 16.11.0
• yarn 3
• hardhat
• Rinkeby/goerli network
• Alchemy
• ganache

contracts

1. SimpleStorage.sol: a simplest smart contract that blockchain user can store and retrieve a value from blockchain.
2. FundMe.sol: user can fund ETH into, the contract owner can withdraw all the funded ETH.
3. Raffle.sol: all users can enter in Raffle, the program will randomly pick up a winner and clean prize pool.
4. Token.sol: ERC20 token.

web

there is a simple html file in web folder, where you can open in chrome and interact with fundMe contract which deployed in your local hardhat network.

yarn install
yarn hardhat node
# start a new terminal, in the same directory
cd web
yarn http-server

please note that some browser may raise cors issue, please use chrome.

add hardhat network in metamask

• your account icon(top right corner) => Settings => Networks => Add Network
• Network name: any name, New RPC URL: http://127.0.0.1:8545, Chain ID: 31337, Currency Symbol: ETH, Save
• Import an account from terminal that's running hardhat node, import the first private key, then you'll have an account in hardhat network that has 10,000 ETH for testing.

sometime you might have this problem nonce too high., please reset your account in metamask(your account icon(top right corner) => Settings => Advanced => Reset Account)

setup environment

yarn install
yarn dlx @yarnpkg/sdks vscode
cp .env.example .env # add your keys

deploy contract to hardhat blockchain

yarn hardhat help
yarn hardhat node
yarn deploy

run lint and test

yarn hardhat typechain
yarn solhint
yarn test

Scripts

yarn hardhat node
yarn hardhat run scripts/fund.ts
yarn hardhat run scripts/withdraw.ts