Solidity Programming Tutorials, Guides & Best Practices

• Website: Libsodium

This cheatsheet highlights essential blockchain libraries that are crucial for developing secure, efficient, and feature-rich blockchain applications. Whether you're working on Ethereum, Bitcoin, or other blockchain platforms, these libraries provide the tools needed to interact with blockchains, manage cryptographic operations, and build decentralized applications.

• Description: The official documentation for OpenZeppelin’s smart contract libraries and tools.
• Key Features:
• Guides on using OpenZeppelin Contracts, SDK, and Defender.
• Best practices for secure smart contract development.
• Tutorials on integrating OpenZeppelin tools with DApps.
• Regularly updated with the latest security features.
• Website: OpenZeppelin Documentation

• Description: An interactive tutorial platform for learning Solidity by building a game.
• Key Features:
• Step-by-step lessons on Solidity and smart contract development.
• Interactive coding exercises and challenges.
• Gamified learning experience.
• Covers basic to advanced Solidity topics.
• Website: CryptoZombies

   npm install --save-dev @nomiclabs/hardhat-etherscan

• Update hardhat.config.js with your Etherscan API key:

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

contract ContractName {
    // State variables
    uint public myUint;
    string public myString;

    // Constructor
    constructor() {
        // Initialization code
    }

    // Functions
    function setMyUint(uint _value) public {
        myUint = _value;
    }

    function getMyUint() public view returns (uint) {
        return myUint;
    }
}

• Value Types:

Different operations in a smart contract consume different amounts of gas. Simple operations like adding two numbers are inexpensive, while more complex operations like loops or external contract calls can be costly. It’s important to understand how various Solidity operations consume gas.

Examples of Gas Costs: