Smart Contracts Programming Tutorials, Guides & Best Practices

• Update hardhat.config.js with your Etherscan API key:

     require("@nomiclabs/hardhat-waffle");
     require("@nomiclabs/hardhat-etherscan");

     module.exports = {
         solidity: "0.8.0",
         networks: {
             ropsten: {
                 url: "https://ropsten.infura.io/v3/YOUR_INFURA_PROJECT_ID",
                 accounts: [`0x${YOUR_PRIVATE_KEY}`]
             }
         },
         etherscan: {
             apiKey: "YOUR_ETHERSCAN_API_KEY"
         }
     };

Explanation:

• string public message: Declares a public string variable to store the message.
• setMessage(string memory newMessage): A function to set a new message.
• getMessage() public view returns (string memory): A function to retrieve the stored message.

Explanation:

• pragma solidity ^0.8.0;: Specifies the version of Solidity.
• contract SimpleStorage: Defines a new smart contract named SimpleStorage.
• uint256 public storedData: Declares a public variable to store an unsigned integer.
• function set(uint256 x) public: A function to set the value of storedData.
• function get() public view returns (uint256): A function to retrieve the value of storedData.