Learn Fsharp - 10 Code Examples & CST Typing Practice Test
F# is a functional-first, strongly typed language on the .NET platform. It blends functional, object-oriented, and imperative styles, offering concise syntax, powerful type inference, and high reliability. Ideal for data science, finance, domain modeling, and backend services.
Learn FSHARP with Real Code Examples
Updated Nov 18, 2025
Practical Examples
Domain modeling with DU’s
Financial risk calculator
Async HTTP service
Data pipeline workflow
ML.NET model integration
Troubleshooting
Resolve type inference errors
Fix pipeline mismatches
Handle async workflow debugging
Address .NET interop issues
Resolve FS0082 pattern matching warnings
Testing Guide
Expecto for unit testing
FsCheck for property testing
xUnit or NUnit
Test computation expressions
Mocking via FsToolkit
Deployment Options
Self-contained .NET executables
Docker containers
Azure Functions
Kubernetes
Fable -> Web apps
Tools Ecosystem
F# compiler (FSC)
Ionide
Visual Studio
Fable (JS compiler)
Paket dependency manager
Integrations
.NET libraries
SQL via Dapper/EF Core
ML.NET
Azure cloud stack
Fable + JS ecosystem
Productivity Tips
Use pipelines aggressively |>
Model domains with DU’s
Use REPL for rapid exploration
Use records for clarity
Challenges
Model a full domain using DU’s
Build a financial calculator
Create an async web service
Generate Fable-based SPA
Frequently Asked Questions about Fsharp
What is Fsharp?
F# is a functional-first, strongly typed language on the .NET platform. It blends functional, object-oriented, and imperative styles, offering concise syntax, powerful type inference, and high reliability. Ideal for data science, finance, domain modeling, and backend services.
What are the primary use cases for Fsharp?
Financial modeling and trading systems. Data science and ML workflows. Backend microservices on .NET. Domain-driven design (DDD). Scientific computation. Scripting & automation. High-reliability enterprise applications
What are the strengths of Fsharp?
Concise & expressive code. Enterprise-grade reliability on .NET. Strong static typing with inference. Excellent for domain modeling. Great for data processing & analysis
What are the limitations of Fsharp?
Smaller community than C#/Python. Not ideal for UI-heavy applications. Learning curve for functional thinking. Corporate teams often prefer C#. Tooling is improving but not perfect
How can I practice Fsharp typing speed?
CodeSpeedTest offers 10+ real Fsharp code examples for typing practice. You can measure your WPM, track accuracy, and improve your coding speed with guided exercises.