HelloWorld.sol

🟩 This is a beginner track.

📜 TL;DR:

• In this tutorial, we will utilize Remix IDE, a versatile, open-source web-based platform, to develop and deploy our smart contract onto Hemi testnet.

• This guide is tested to work with Solidity version 0.8.26. If you experience any issues, try setting this version explicitly in the Solidity Compiler tab on Remix.

• Earn and track Hemi points for completing this tutorial!

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🏁 Prerequisites

1. MetaMask Wallet Setup

2. Tunnel ETH to Hemi

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📚 Tutorial

Video

1. Go to Remix IDE

Remix IDE is a powerful, open-source web application for developing, compiling, and deploying Ethereum smart contracts with ease.

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2. Add the Smart Contract

In Remix IDE, start by creating a new file named HelloWorld.sol.

• The following contract is a basic example designed for interaction. Copy the code below and paste it into the file HelloWorld.sol.

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

contract HelloWorld {
    string public greeting = "Hello, World!";

    function getGreeting() public view returns (string memory) {
        return greeting;
    }

    function setGreeting(string memory _greeting) public {
        greeting = _greeting;
    }
}

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3. Compile the Contract

Select Compile HelloWorld.sol button to use the Remix IDE's Solidity compiler. Check for any compilation errors and fix them.

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4. Connect Remix To MetaMask

The address you choose to connect MUST have some ETH (recommended at least 0.01 ETH) to pay for contract deployment fees. Refer back to earlier documentation to fund your Hemi address with ETH.

Choose Injected Provider - MetaMask under "Environment".

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5. Confirm the Connection

• A pop-up from MetaMask will appear to confirm the connection. Select Next.

• Select Connect

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6. Link to Hemi Account

• Link to the relevant Hemi account in the "Account" drop-down.

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7. Deploy

Execute the deployment of your smart contract to the Hemi network directly from Remix IDE.

Uncheck Publish to IPFS.Note: if you get a warning about Gas Limit, you may ignore it and proceed.

• Select Deploy

• Your MetaMask will pop-up to confirm the deployment of your smart contract. Select Confirm

🥳 Wohoooo! If successful you should see a ✅ in the console.

⚠️ If it fails, double check that the Solidity version in the compiler is the correct version.