Remix IDE

Remix IDE is an open source web and desktop application. It fosters a fast development cycle and has a rich set of plugins with intuitive GUIs. Remix is used for the entire journey of contract development as well as act as a playground for learning and teaching Ethereum.

Visit https://remix.ethereum.org/

Writing your smart contract

Create a "New File" under contracts with name HelloWorld.sol.

remix_1

Copy and paste the code below to HelloWorld.sol file.

// SPDX-License-Identifier: MIT
pragma solidity 0.8.17; // Specifies the version of Solidity, using semantic versioning.
 
contract HelloWorld { // Defines a contract named `HelloWorld`
 
   string public message; // Declares a state variable `message` of type `string`.
 
   constructor(string memory initMessage) {    // Constructors are used to initialize the contract's data.
      message = initMessage;      // Accepts a string argument `initMessage`.
   }
 
   function update(string memory newMessage) public { // A public function that accepts a string argument.
      message = newMessage;
   }
 
}