Smart Contract Development Tutorial

Learn how to create, deploy, and interact with smart contracts using the Elona blockchain platform.

Start Building

Key Requirements

Solidity

Familiarity with Solidity programming language and Ethereum Virtual Machine concepts.

Tooling

Install Elona SDK and a compatible development environment with Solidity compiler.

Testnet

Access Elona Testnet with a connected wallet for deployment and testing.

Your First Smart Contract

1. Basic Contract

{`// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

contract SimpleStorage {
    uint storedData;

    function set(uint x) public {
        storedData = x;
    }

    function get() public view returns (uint) {
        return storedData;
    }
}`}

This contract allows storage and retrieval of a simple unsigned integer value on-chain.

2. Interaction

{`async function readWrite() {
    const contract = new ElonaContract('');
    const value = await contract.get();
    
    console.log('Stored value:', value);
    
    await contract.set(42);
    const newValue = await contract.get();
    
    console.log('New value:', newValue);
}`}

Example JavaScript interaction using the Elona SDK to deploy and interact with a contract.

Step-by-Step Guide

1

Initialize Project

Use the Elona CLI to scaffold a new smart contract project with basic testing templates.

elona init MyContract
2

Write Contract

Develop your contract logic in the contracts/ directory using Solidity.

cd MyContract
code contracts/MyContract.sol
3

Deploy & Test

Deploy to testnet and interact using the provided SDK or web3 integrations.

elona deploy
elona test

Advanced Patterns

Access Control

{`function restrict() public onlyAdmin {
    // Only authorized users can execute
}
modifier onlyAdmin() {
    require(msg.sender == admin, "Forbidden");
    _;
}`}

Use modifiers to restrict function access based on sender identity or role.

Event Logging

{`event ValueSet(uint newValue);

function set(uint x) public {
    value = x;
    emit ValueSet(x);
}`}

Track contract activity using events for transparency and debugging.

Security Considerations

Reentrancy

Use the nonReentrant modifier for external function calls.

Upgradability

Plan for contract upgrades using proxy patterns from the beginning.

Gas Fees

Optimize logic to minimize transaction costs with proper pattern selection.