AdvancedStorage

A Solidity-based smart contract project using Hardhat, designed to store and retrieve numbers and names efficiently. Includes SimpleStorage, ExtraStorage, and StorageFactory contracts.

Features

• Store and retrieve numbers in the blockchain.
• Supports multiple storage contracts.
• Extend functionality with ExtraStorage.
• Deploy contracts locally using Hardhat.
• Test contracts with Mocha/Chai.

Prerequisites

• Windows 11 (or any OS)
• Node.js (v18+ recommended) ➝ Download
• NPM (included with Node.js)
• Hardhat (installed with the project)
• VS Code (recommended for development)

Installation

Clone the repository

git clone https://github.com/nayandas69/advancedstorage.git
cd advancedstorage

Install dependencies

npm install

How to Use

Start Hardhat Local Blockchain

Open a terminal and run:

npx hardhat node

This will start a local Ethereum blockchain.

Compile Contracts

Run:

npx hardhat compile

If successful, it will output:

Compiled 3 Solidity files successfully (evm target: london).

Deploy Contracts

Open another terminal and run:

npx hardhat run scripts/deploy.js --network localhost

If successful, it will output:

Contract deployed to: 0x123...abc

Run Tests

Run:

npx hardhat test

If successful, it will output:

✅ Should store and retrieve a value (200ms)

Smart Contracts

SimpleStorage

Stores a number and allows retrieval.

function store(uint256 _favoriteNumber) public;
function retrieve() public view returns (uint256);

ExtraStorage

Extends SimpleStorage to always add +5 to stored numbers.

function store(uint256 _favoriteNumber) public override;

StorageFactory

Manages multiple SimpleStorage contracts.

function createSimpleStorageContract() public;
function sfStore(uint256 _index, uint256 _number) public;
function sfGet(uint256 _index) public view returns (uint256);

Troubleshooting

Hardhat: Scripts Disabled on Windows

Error:

npx : File C:\Program Files\nodejs\npx.ps1 cannot be loaded because running scripts is disabled

• Fix: Run this command:

Set-ExecutionPolicy -Scope Process -ExecutionPolicy Bypass

Hardhat: Trying to use a non-local installation

Error:

Error HH12: Trying to use a non-local installation of Hardhat

• Fix: Reinstall Hardhat locally:

npm install --save-dev hardhat

Cannot find module '@nomicfoundation/hardhat-toolbox'

Error:

Error: Cannot find module '@nomicfoundation/hardhat-toolbox'

• Fix: Run:

npm install --save-dev @nomicfoundation/hardhat-toolbox

TypeError: simpleStorage.deployed is not a function

Error:

TypeError: simpleStorage.deployed is not a function

• Fix:
  Use:

console.log("Contract deployed to:", simpleStorage.address);

Instead of:

await simpleStorage.deployed();

License

This project is licensed under the MIT License.