Learn Haskell - 10 Code Examples & CST Typing Practice Test
Haskell is a purely functional, statically typed programming language known for immutability, strong type inference, mathematical precision, and high reliability. It is widely used in finance, compilers, research, distributed systems, and correctness-critical software.
View all 10 Haskell code examples →
Learn HASKELL with Real Code Examples
Updated Nov 18, 2025
Practical Examples
Functional utilities
Basic web server
Concurrent pipeline
Parser combinator
Compiler-style transformations
Troubleshooting
Resolve type mismatches
Fix lazy evaluation performance issues
Handle monad stack confusion
Resolve Cabal/Stack conflicts
Testing Guide
Hspec for unit testing
QuickCheck for property testing
Test monadic code with mocks
Benchmark using Criterion
Deployment Options
Compile to native binary
Docker containers
Cloud VMs
Kubernetes
Serverless via custom runtimes
Tools Ecosystem
GHC compiler
Cabal & Stack
Haskell Language Server
Servant, Yesod, Scotty
Conduit, STM libraries
Integrations
Databases via Persistent/Beam
Cloud APIs
Kafka/RabbitMQ
Web services
Blockchain frameworks
Productivity Tips
Start in ghci REPL
Use pure functions first
Add types early
Profile laziness
Challenges
Write a parser
Build a simple compiler
Create a concurrency system with STM
Build a Servant API
Frequently Asked Questions about Haskell
What is Haskell?
Haskell is a purely functional, statically typed programming language known for immutability, strong type inference, mathematical precision, and high reliability. It is widely used in finance, compilers, research, distributed systems, and correctness-critical software.
What are the primary use cases for Haskell?
Pure functional application development. Distributed systems. Financial trading engines. Compilers & language tooling. Formal verification. Research & algorithm modeling. Simulation & high-assurance software
What are the strengths of Haskell?
Extremely safe and reliable. Concise, expressive code. Powerful type system. Great for concurrency. Excellent for correctness-critical work
What are the limitations of Haskell?
Steeper learning curve. Smaller industry adoption. Slower prototyping than Python/JS. Harder onboarding for teams. Limited mobile ecosystem
How can I practice Haskell typing speed?
CodeSpeedTest offers 10+ real Haskell code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.