Product type
A product type is a composite type whose values combine one value from each of several component types, such as a tuple or record.
Functional Design and Architecture: Examples in Haskell
A product type combines multiple component values into one composite value, such as a tuple or record.
- How it is used
- Uses product types to construct functional domain models and composite data structures.
- How deep it goes
- Defines tuples and records as product types and places them within algebraic data types, without detailing implementation semantics.
- Examples
- Demonstrates product types through PersonName tuples and Person records containing names and ages.
- What you can do after
- Build it from scratch by combining related values into tuple- or record-shaped domain types.
Read how Functional Design and Architecture: Examples in Haskell explains product type →
Write Powerful Rust Macros
A product type is a composite type whose possible values are combinations of values from all its component fields.
- How it is used
- Frames struct-like values as algebraic data types while motivating controlled alternatives for error handling.
- How deep it goes
- Defines state multiplication with a worked example, then contrasts product types with sum types without implementing product types.
- Examples
- Uses a struct containing a u8 and boolean, contrasting values such as 120,true and 119,true.
- What you can do after
- Evaluate how a struct’s field combinations expand its state space and why validation may require conditionals.
Related concepts
- union typecontrasts with · A union type is a type whose values can be any one of several specified alternative types or variants.
- algebraic data typekind of · An algebraic data type is a composite type whose values are formed from product structures, finite alternatives, or both through type constructors.
- Cartesian productuses · A Cartesian product is the set of all ordered tuples formed by selecting one element from each of multiple sets or sequences.
- anonymous recordincludes · An anonymous record is an F# record value with named fields whose record type is inferred without an explicit named type declaration.
- tupleincludes · A tuple is a finite, ordered collection of elements treated as a single composite value or record.
- recordincludes · A record is a structured data unit or type that groups related values into fields or properties, typically to represent one item, entity, or observation.
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