Solidity Fundamentals

Solidity is the most widely used programming language for writing smart contracts on Ethereum and EVM-compatible blockchains. It is a statically typed, object-oriented language influenced by JavaScript, Python, and C++.

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Setting Up a Solidity Development Environment

Tool	Purpose
Remix IDE	Browser-based IDE for quick prototyping (remix.ethereum.org)
Hardhat	JavaScript/TypeScript development framework for testing and deployment
Foundry	Rust-based toolkit with fast compilation and testing (forge, cast, anvil)
OpenZeppelin	Library of audited, reusable smart contract components
Slither	Static analysis tool for finding vulnerabilities

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Basic Contract Structure

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

contract SimpleStorage {
    // State variable (stored on-chain)
    uint256 private storedValue;

    // Event emitted when value changes
    event ValueChanged(uint256 newValue);

    // Function to set the value
    function set(uint256 _value) public {
        storedValue = _value;
        emit ValueChanged(_value);
    }

    // Function to get the value (view = no state modification)
    function get() public view returns (uint256) {
        return storedValue;
    }
}

Key Elements