Learn Ink - 10 Code Examples & CST Typing Practice Test
Ink! is a Rust-based eDSL (embedded domain-specific language) for writing smart contracts on the Substrate blockchain framework. It emphasizes safety, efficiency, and tight integration with Polkadot and Substrate ecosystems.
Learn INK with Real Code Examples
Updated Nov 25, 2025
Architecture
Rust compiler -> Wasm bytecode
Storage structs define state
Messages as external callable functions
Event logging integrated in Wasm
Metadata defines contract ABI for frontends
Rendering Model
Rust code -> ink! macros -> Wasm bytecode
Contract metadata for ABI
Storage struct layout
Event emission model
Cross-contract call ABI
Architectural Patterns
Storage struct for state
Messages as public API
Events for logging
Traits for modular calls
Composable multi-contract logic
Real World Architectures
DeFi lending & staking
NFT marketplaces
On-chain governance modules
Cross-contract DeFi protocols
Parachain-specific applications
Design Principles
Safety and type guarantees
Wasm-native execution
Rust ecosystem leverage
Predictable gas and storage
Composable contracts
Scalability Guide
Use traits for modularity
Keep Wasm size manageable
Optimize storage layout
Split contracts logically
Use metadata efficiently
Migration Guide
Rewrite Solidity/Vyper contracts in Rust + Ink!
Replace storage variables with #[ink(storage)]
Rewrite public functions as #[ink(message)]
Map events using #[ink(event)]
Deploy on Substrate instead of EVM
Frequently Asked Questions about Ink
What is Ink?
Ink! is a Rust-based eDSL (embedded domain-specific language) for writing smart contracts on the Substrate blockchain framework. It emphasizes safety, efficiency, and tight integration with Polkadot and Substrate ecosystems.
What are the primary use cases for Ink?
High-security smart contracts. DeFi protocols on Substrate. NFT minting and marketplaces. On-chain governance modules. Wasm-based blockchain apps
What are the strengths of Ink?
Safe, type-checked contracts. High performance via Wasm. Strong ecosystem support in Polkadot. Auditable Rust code. Predictable gas and storage behavior
What are the limitations of Ink?
Limited to Substrate/Wasm chains. Smaller ecosystem than Solidity/EVM. Requires Rust proficiency. No EVM compatibility. Less tooling for testing vs EVM chains
How can I practice Ink typing speed?
CodeSpeedTest offers 10+ real Ink code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.