mes/scaffold/boot/4d-let-map.scm

40 lines
1.2 KiB
Scheme

;;; GNU Mes --- Maxwell Equations of Software
;;; Copyright © 2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
;;;
;;; This file is part of GNU Mes.
;;;
;;; GNU Mes is free software; you can redistribute it and/or modify it
;;; under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 3 of the License, or (at
;;; your option) any later version.
;;;
;;; GNU Mes is distributed in the hope that it will be useful, but
;;; WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
(define map 'boo)
(define (map f lst)
(if (null? lst) (list)
(cons (f (car lst)) (map f (cdr lst)))))
(define (cadr x) (car (cdr x)))
(define-macro (let bindings . rest)
(cons (cons 'lambda (cons (map car bindings) rest))
(map cadr bindings)))
(let ((a 0)
(b 1)
(c 2)
(d 3)
(e 4)
(f 5)
(g 6)
(h 7)
(i 8))
(+ a b))