RosettaCodeData/Task/Classes/EchoLisp/classes-1.echolisp

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(lib 'gloops) ; load oo library
(define-class Person null (name (age :initform 66)))
(define-method tostring (Person) (lambda (p) ( format "🚶 %a " p.name)))
(define-method mailto (Person Person) (lambda( p o) (printf "From %a to %a : ..." p o)))
;; define a sub-class of Person with same methods
(define-class Writer (Person) (books))
(define-method tostring (Writer) (lambda (w)( format "🎩 %a" w.name)))
(define-method mailto (Person Writer)
(lambda (p w) (printf " From %a (age %d). Dear writer of %a ..." p p.age w.books )))