Learn Solidity - 10 Code Examples & CST Typing Practice Test
Solidity is a statically typed, contract-oriented programming language designed for building smart contracts on the Ethereum blockchain. It enables developers to write decentralized applications (dApps), manage digital assets, and automate trustless logic using a syntax inspired by JavaScript, C++, and Python.
Learn SOLIDITY with Real Code Examples
Updated Nov 19, 2025
Explain
Solidity compiles to EVM bytecode and runs on Ethereum nodes.
It powers smart contracts that govern DeFi, NFTs, DAOs, identity systems, and decentralized automation.
Supports inheritance, modifiers, events, libraries, interfaces, and blockchain-specific features like address types and payable functions.
Core Features
Contracts, interfaces, abstract contracts
Mappings, structs, arrays
Events & logs
Fallback & receive functions
Error handling: require, revert, assert
Basic Concepts Overview
Contracts & state variables
Functions (public, private, external)
Mappings, arrays, structs
Modifiers & events
ABI encoding & gas
Project Structure
contracts/
scripts/
test/
deploy/
artifacts/build-info/
Building Workflow
Write Solidity contract in .sol file
Compile with Solidity compiler (solc)
Deploy using Hardhat/Foundry/Truffle
Test using Mocha/Chai or Foundry tests
Interact via scripts or dApp front-end
Difficulty Use Cases
Beginner: ERC-20 token, simple storage contract
Intermediate: NFT collections, staking rewards
Advanced: DEX, lending pools, multi-sig wallets
Expert: zk-integrated contracts, MEV-resistant systems
Comparisons
Solidity vs Rust (Solana): EVM vs non-EVM
Solidity vs Vyper: syntax & security differences
Solidity vs Move (Sui/Aptos): resource model
Solidity vs JavaScript: on-chain vs off-chain logic
Solidity vs Python: static vs dynamic
Versioning Timeline
2014 - Solidity introduced
2016 - Major updates, inheritance
2018 - ABIEncoderV2
2021 - Custom errors
2023-2025 - Optimizer improvements & language hardening
Glossary
EVM: Ethereum Virtual Machine
ABI: Application Binary Interface
Gas: execution cost
Address: 20-byte account identifier
Event: logged blockchain data
Frequently Asked Questions about Solidity
What is Solidity?
Solidity is a statically typed, contract-oriented programming language designed for building smart contracts on the Ethereum blockchain. It enables developers to write decentralized applications (dApps), manage digital assets, and automate trustless logic using a syntax inspired by JavaScript, C++, and Python.
What are the primary use cases for Solidity?
Smart contract development. DeFi protocols (DEXs, lending, staking). NFT standards (ERC-721, ERC-1155). Token creation (ERC-20). DAO governance mechanisms. Permissioned enterprise blockchain apps
What are the strengths of Solidity?
Native support for Ethereum standards. Large community & ecosystem. Powerful for financial logic. Extensive tooling (Hardhat, Foundry, Truffle). Rich developer resources
What are the limitations of Solidity?
Security vulnerabilities are common. Gas-cost constraints. Upgradability complexity. Difficult debugging across chains. Blockchain immutability adds risk
How can I practice Solidity typing speed?
CodeSpeedTest offers 10+ real Solidity code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.