Setting Up the Development Environment
Setting Up the Development Environment
Step 1: Install Hardhat
Hardhat is a development environment for Ethereum software designed to make the development process easier and more efficient.
1. Create a new directory as the project folder and enter that directory:
Initialize a new npm project:
Install Hardhat:
Create a new Hardhat project:
Follow the prompts to create a basic sample project.
Step 2: Project Structure
Your project structure should look like the following:
emc-dapp/
├── contracts
│ └── Greeter.sol
├── scripts
│ └── sample-script.js
├── test
│ └── sample-test.js
├── hardhat.config.js
├── package.json
└── README.md
Step 3: Write a smart contract
exist contracts Create a simple smart contract in the directory. For example,Greeter.sol contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract Greeter {
string private greeting;
constructor(string memory _greeting) {
greeting = _greeting;
}
function greet() public view returns (string memory) {
return greeting;
}
function setGreeting(string memory _greeting) public {
greeting = _greeting;
}
}
Step 4: Compile the contract
Compile your smart contract to make sure everything is set up correctly:
npx hardhat compile
Step 5: Deploy the contract
exist scripts Create a deployment script in the directory, for example deploy.js：
async function main() {
const [deployer] = await ethers.getSigners();
console.log("Deploying contracts with the account:", deployer.address);
const Greeter = await ethers.getContractFactory("Greeter");
const greeter = await Greeter.deploy("Hello, EMC!");
console.log("Greeter deployed to:", greeter.address);
}
main()
.then(() => process.exit(0))
.catch(error => {
console.error(error);
process.exit(1);
});
Deploy the contract to the EMC chain:
npx hardhat run scripts/deploy.js --network emc
Step 6: EMC chain configuration
Update yourhardhat.config.jsTo include the configuration of the EMC chain:
require("@nomiclabs/hard-waffle");
module.exports = {
solidity: "0.8.4",
networks: {
emc: {
url: "https://rpc1.emc.network",
accounts: [`0x${process.env.PRIVATE_KEY}`]
}
}
};
https://rpc1.emc.networkThe actual RPC URL for the EMC Testnet and make sure your private key is set in the environment variables.
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