Overview

Type-Level Thinking: Safer APIs and Invariants in Haskell and F# What if your compiler could catch entire categories of bugs before your code ever runs? In Type-Level Thinking, you'll discover how to turn advanced type systems into practical tools for building bulletproof software. This hands-on, insight-driven guide shows you how to encode business rules, invariants, and domain constraints directly into the type system-so invalid states become unrepresentable and runtime errors become compile-time guarantees. Focusing on Haskell and F#, the book bridges theory and real-world engineering. You'll move beyond basic algebraic data types into powerful techniques such as: Designing APIs that enforce correctness by construction Encoding domain rules with phantom types and smart constructors Leveraging GADTs and type-level programming in Haskell Using F#'s discriminated unions and units of measure for stronger models Eliminating whole classes of bugs through expressive type design Refactoring legacy code into safer, intention-revealing systems Through clear explanations, practical examples, and progressive case studies, you'll learn to think in types-not just use them. Whether you're designing financial systems, distributed services, or domain-driven applications, you'll see how type-level techniques reduce complexity, improve maintainability, and make your APIs self-documenting.

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