define-struct creates a struct-like product type with named fields.

Syntax

(define-struct ⟨name⟩
  (⟨field-name⟩ ⟨docstring⟩? ⟨type⟩)...)

Semantics

  • Toplevel form to define a new struct-like data type.
  • Structs are useful when named fields are clearer than positional fields of define-type.
  • A field named f is accessed with the operator .f.
  • A struct name is conventionally written in CamelCase.

Example

(define-struct Point
  (x Integer)
  (y Integer))

(let ((p (Point 1 2))
  (Point (.y p) (.x p))))