Calc Contract Learning Project

This is a learning project that implements a simple calculator contract using Solidity. The project demonstrates various concepts including:

• Custom value types using type in Solidity
• Basic arithmetic operations
• Event emissions
• State management
• Testing with both Foundry and Hardhat

Project Structure

The project follows a hybrid structure that works with both Foundry and Hardhat:

├── src/           # Solidity source files
│   ├── Calc.sol   # Main calculator contract
│   └── CalcParamLib.sol  # Library for calcParam type
├── test/          # Test files
│   ├── Calc.t.sol # Foundry tests
│   └── Calc.t.js  # Hardhat tests
├── script/        # Deployment scripts
│   └── deploy-arbitrum-sepolia.js
└── foundry.toml   # Foundry configuration

Features

• Custom Value Type: Uses calcParam type for calculations
• Basic Operations: Addition, subtraction, multiplication, and division
• Error Handling: Division by zero protection
• Event Tracking: Emits events for all operations
• Result Storage: Keeps track of the latest result per address

Setup

1. Clone the repository

2. Install dependencies:

   npm install

3. Create a .env file in the project root with the following variables:

   PRIVATE_KEY=your_private_key_here
   ARBISCAN_API_KEY=your_arbiscan_api_key_here
   

Testing

Hardhat Tests

npx hardhat test

Foundry Tests

forge test

Deployment

The project includes deployment scripts for the Arbitrum Sepolia testnet:

1. Deploy the contract:

   npx hardhat run script/deploy-arbitrum-sepolia.js --network arbitrumSepolia

2. Verify the contract on Arbiscan:

   npx hardhat verify --network arbitrumSepolia <deployed_contract_address>

Development Tools

• Hardhat: Main development framework
• Foundry: Used for Solidity testing
• @nomicfoundation/hardhat-foundry: Plugin to integrate Hardhat with Foundry's project structure
• Arbitrum Sepolia: Test network for deployment