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
Explain
F# is functional-first but supports OOP and imperative features.
Runs on .NET, giving access to the entire .NET ecosystem.
Popular in finance, data engineering, scientific computing, and reliable backend services.
Core Features
Expressions over statements
Powerful type inference
Discriminated unions
Pattern matching everywhere
Pipelining with |> operator
Async workflows
Basic Concepts Overview
Immutability
Discriminated unions
Record types
Sequences, lists, arrays
Pattern matching
Pipelines & higher-order functions
Project Structure
Program.fs (entry point)
Library modules in separate .fs files
.fsproj config
paket.dependencies / nuget
tests/ folder
Building Workflow
Create project via dotnet new console -lang F#
Define modules & functions
Add dependencies
Use fsi for exploration
Build & run
Deploy via .NET runtime
Difficulty Use Cases
Beginner: basic functions & lists
Intermediate: DU’s, records, modules
Advanced: async workflows, computation expressions
Expert: DDD modeling, compilers, financial engines
Comparisons
More concise than C#
More enterprise-ready than Python
More type-safe than JavaScript
Less concurrency-focused than Elixir
More accessible tooling than Haskell
Versioning Timeline
2005 - Initial Microsoft Research release
2010 - F# 2.0 (async workflows)
2014 - F# 3.0 (type providers)
2015-2025 - Continuous .NET Core improvements
Glossary
Computation Expression: workflows like async
DU: discriminated union
Record: immutable structured type
Pipeline operator: forward value passing
Sequence: lazy collection
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.