atelier-typescript-functional-patterns

Discriminated unions in TypeScript model domain states exhaustively, making illegal states unrepresentable by enforcing type-safe pattern matching and preventing invalid runtime state transitions.

Option and Result types provide explicit error handling in TypeScript, forcing the caller to acknowledge potential failure cases safely without relying on runtime exceptions.

Branded types in TypeScript tag primitive values like strings or numbers at the type level, ensuring domain-safe identifiers and units are structurally distinct and preventing invalid assignments across your codebase.

Yes, functional programming patterns support modeling state machines in TypeScript projects of varying sizes by using algebraic data types and smart constructors to enforce clear separation of concerns.

Use algebraic data types instead of standard interfaces when you need exhaustive pattern matching and strict domain modeling to encode business rules directly into the type system.