fp-ts Algebraic Data Types and Type Classes
fp-ts Algebraic Data Types and Type Classes
This skill covers algebraic data types (ADTs) and type classes in fp-ts for robust domain modeling in TypeScript.
Core Concepts
What are Algebraic Data Types?
Algebraic Data Types (ADTs) are composite types formed by combining other types. There are two fundamental kinds:
- Product Types: Combine types with AND (tuples, records) - "A user HAS a name AND an email"
- Sum Types: Combine types with OR (discriminated unions) - "A result IS either success OR failure"
What are Type Classes?
Type classes define behavior that can be implemented for different types. In fp-ts, they're represented as interfaces with instances for specific types:
- Eq: Equality comparison
- Ord: Ordering/comparison
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