Decentralized Application Development Tutorials, Guides & Insights

Navigate to the contracts directory and create a new file called MyDapp.sol:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

contract MyDapp {
    string public message;

    event MessageChanged(string newMessage);

    constructor(string memory initialMessage) {
        message = initialMessage;
    }

    function setMessage(string memory newMessage) public {
        message = newMessage;
        emit MessageChanged(newMessage);
    }

    function getMessage() public view returns (string memory) {
        return message;
    }
}