Smart Constructor

Definitions

1. A function that wraps the raw data constructor of a type and enforces additional invariants at construction time — returning an error or Maybe/Option if the input is invalid — so that any value of that type is guaranteed to be well-formed throughout the program.

   In plain English: A special factory function that only creates an object if the input is valid, so you can trust that every instance is correct by design.

   Example: "Use a smart constructor for EmailAddress that validates the format, so downstream code never has to re-check."

Related Terms

• Algebraic Data Type
• Category
• Currying
• Functor
• GHC
• Lazy Evaluation
• Monad
• Opaque Type
• Point-Free Style
• Reader Monad
• Thunk
• Transducer