ℹ️ Important: This repo is no longer maintained; we invite all people learning Solidity to head to Cyfrin Updraft! The 100% free #1 smart contract education platform on earth. Developed with love by Patrick & Cyfrin <3
This is a section of the Javascript Blockchain/Smart Contract FreeCodeCamp Course.
⌨️ (08:20:17) Lesson 6: Hardhat Simple Storage
This repo has been updated for Sepolia over Goerli.
- Hardhat Simple Storage
- - Usage
- Getting Started
- Usage
- In it's current state, if you have your api key set, it will auto verify rinkeby contracts!
- Linting
- Thank you!
- Useage
- Linting
- Thank you!
This project is apart of the Hardhat FreeCodeCamp video.
- git
- You'll know you did it right if you can run
git --versionand you see a response likegit version x.x.x
- You'll know you did it right if you can run
- Nodejs
- You'll know you've installed nodejs right if you can run:
node --versionand get an output like:vx.x.x
- You'll know you've installed nodejs right if you can run:
- Yarn instead of
npm- You'll know you've installed yarn right if you can run:
yarn --versionand get an output like:x.x.x- You might need to install it with
npmorcorepack
- You'll know you've installed yarn right if you can run:
git clone https://github.com/PatrickAlphaC/hardhat-simple-storage-fcc
cd hardhat-simple-storage-fcc
yarn
yarn hardhat
For the typescript edition, run:
git checkout typescript
If you can't or don't want to run and install locally, you can work with this repo in Gitpod. If you do this, you can skip the clone this repo part.
Deploy:
npx hardhat run scripts/deploy.js
npx hardhat test
npx hardhat coverage
You can estimate how much gas things cost by running:
npx hardhat test
And you'll see and output file called gas-report.txt
If you'd like to run your own local hardhat network, you can run:
npx hardhat node
And then in a different terminal
npx hardhat run scripts/deploy.js --network localhost
And you should see transactions happen in your terminal that is running npx hardhat node
If you use metamask with a local network, everytime you shut down your node, you'll need to reset your account. Settings -> Advanced -> Reset account. Don't do this with a metamask you have real funds in. And maybe don't do this if you're a little confused by this.
- Setup environment variables
You'll want to set your SEPOLIA_RPC_URL and PRIVATE_KEY as environment variables. You can add them to a .env file, similar to what you see in .env.example.
PRIVATE_KEY: The private key of your account (like from metamask). NOTE: FOR DEVELOPMENT, PLEASE USE A KEY THAT DOESN'T HAVE ANY REAL FUNDS ASSOCIATED WITH IT.- You can learn how to export it here.
SEPOLIA_RPC_URL: This is url of the sepolia testnet node you're working with. You can get setup with one for free from Alchemy
- Get testnet ETH
Head over to faucets.chain.link and get some tesnet ETH. You should see the ETH show up in your metamask.
- Deploy
npx hardhat run scripts/deploy.js --network sepolia
If you deploy to a testnet or mainnet, you can verify it if you get an API Key from Etherscan and set it as an environment variable named ETHERSCAN_API_KEY. You can pop it into your .env file as seen in the .env.example.
In it's current state, if you have your api key set, it will auto verify sepolia contracts!
However, you can manual verify with:
npx hardhat verify --constructor-args arguments.js DEPLOYED_CONTRACT_ADDRESS
To check linting / code formatting:
yarn lint
or, to fix:
yarn lint:fix
If you appreciated this, feel free to follow me or donate!
ETH/Polygon/Avalanche/etc Address: 0x9680201d9c93d65a3603d2088d125e955c73BD65
