Overview

The Functional Language Microsoft Built - Now with AI SuperpowersF# is the best-kept secret in the .NET world. It gives you full access to ASP.NET Core, Azure SDKs, Entity Framework, and over 300,000 NuGet packages - while bringing the elegance, safety, and testability of functional programming that makes your code dramatically easier to reason about and maintain. F# Programming with AI is your complete guide to mastering it, from your first immutable variable to building five production-grade, AI-powered applications. In 2026, as AI workloads and data pipelines dominate backend development, F#'s composition model, strong type inference, and computation expressions make it uniquely positioned for intelligent systems. This book teaches you both the language and how to use it to build backends that think. What You'll Learn: F# fundamentals: type inference, immutability, function composition, and pattern matching Discriminated unions, records, and F#'s powerful type system for modelling domain logic Asynchronous workflows, concurrent programming, and computation expressions Building Web APIs with ASP.NET Core in F#, database integration, and cloud deployment Data science and analytics pipelines using the F# ecosystem Interoperability with C# and the full .NET ecosystem Integrating OpenAI and LLM APIs into F# applications Prompt engineering patterns for data and AI pipelines Semantic search, vector database concepts, and AI-assisted automation workflows Building intelligent data applications and recommendation engines 37 Chapters. .NET. ASP.NET Core. AI-Powered.Organized across four progressive parts - F# Foundations, Intermediate & Advanced F#, AI & Modern Development, and Real-World Projects - the book takes you from a single printfn to deploying cloud-hosted, AI-integrated systems. Six appendices deliver quick references for F# syntax, the dotnet CLI, NuGet packages, discriminated unions, AI integration checklists, and a recommended learning path. By the end you will have built a functional task management system, an AI-powered chat assistant, a smart analytics dashboard, a recommendation engine, and an AI-assisted data processing platform - all in F#. Perfect For: C# or .NET developers who want to explore functional programming without leaving the ecosystem Python data scientists who want stronger types, better performance, and .NET tooling Developers building data pipelines, analytics backends, or AI-powered processing systems Programmers curious about functional programming who want a practical, project-driven approach Anyone who wants to combine the safety of functional programming with the breadth of .NET The power of .NET. The elegance of functional programming. The intelligence of AI. Start with F# today.

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