Solidity Programming Tutorials, Guides & Best Practices

• Description: An open-source blockchain explorer for Ethereum-based networks.
• Key Features:
• Provides a user-friendly interface for exploring blocks, transactions, and tokens.
• Supports custom networks and sidechains.
• Allows token holders to track token balances and transaction histories.
• Easy to deploy and customize.
• Website: BlockScout

• Description: A decentralized oracle network that provides real-world data to smart contracts.
• Key Features:
• Fetches data from APIs and off-chain sources for use in smart contracts.
• Secure and reliable, with decentralization to avoid single points of failure.
• Supports various data types including price feeds, weather data, and more.
• Integrates easily with Ethereum smart contracts.
• Website: Chainlink

• Start a local Ethereum node using Hardhat:

     npx hardhat node

• assert: Used to check for conditions that should never be false.

• revert: Explicitly reverts the transaction, optionally providing an error message.

• Arithmetic Operations: Adding, subtracting, or multiplying integers consumes minimal gas (e.g., 3-5 gas units).
• Storage Operations: Writing data to the blockchain (e.g., updating a state variable) is expensive (e.g., 20,000 gas units).
• Function Calls: Calling a function, especially one that interacts with another contract, can significantly increase gas consumption.

Optimizing gas consumption in smart contracts can lead to substantial cost savings, especially for frequently executed contracts. Here are some strategies to consider:

To build a DApp, you first need a smart contract that will serve as the backend logic. Let’s create a simple smart contract that allows users to store and retrieve a message on the blockchain.

Example Contract: