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
Practical Examples
Simple key-value store
ERC-20-like token
NFT minting and transfer
Voting and governance module
Cross-contract calls for DeFi pools
Troubleshooting
Check Rust compiler errors
Ensure ink! macros used correctly
Verify storage types
Validate event definitions
Test cross-contract calls
Testing Guide
Write Rust unit tests in tests/ folder
Use cargo-contract test
Validate storage updates
Check event emissions
Test cross-contract interactions
Deployment Options
Local Substrate node
Polkadot testnet
Kusama parachain
Polkadot.js deploy
CI/CD pipelines with cargo-contract
Tools Ecosystem
cargo-contract CLI
Substrate node template
Polkadot.js front-end
Ink! unit testing in Rust
ink! playground (online)
Integrations
Polkadot and Kusama chains
Substrate-based parachains
Frontends via Polkadot.js
Off-chain workers
Cross-contract modules within Substrate
Productivity Tips
Leverage ink! macros
Write modular contracts
Unit-test extensively
Keep Wasm code minimal
Use cargo-contract CLI efficiently
Challenges
Rust complexity for beginners
Wasm contract size limits
Cross-contract interaction nuances
Limited pre-built libraries
Debugging Wasm can be tricky
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.