meikei-99 / solidity_fundme

Solidity Fund Me

Leaning smart contract whereby account users can fund and withdraw ETH 📊

Here are some features of this smart contract:

• allows user to fund the smart contract with minimum amount of 50 USD
• allows user to fully withdraw their fund, leaving the smart contract with balance of zero
• ensures that only those who fund the smart contract can withdraw ETH

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What I learnt:

• how to use ether.js and hardhat
• fetching latest ETH price in USD from chainlink price feed
• optimize gas cost by storing state variables from storage to memory
• include Goerli RPC Endpoints using Alchemy
• writing unit and staging test

To be improved:

• Allow to switch between networks
• Allow to switch between users

Quickstart

1. Clone the repo

git clone https://github.com/meikei-99/hardhat-fund-me.git

2. To execute a transaction, you will need to start a local hardhat blocchain

npx hardhat node / yarn hardhat node

3. Update constants.js with new contract address
4. Connect MetaMask to local hardhat blockchain (chainId:31337)

Credits go to @freeCodeCamp and @PatrickAlphaC who provide guidance in writing this piece.