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(define make-add (lambda (a) (lambda (b) (+ a b))))
(define add4 (make-add 4))
(add4 5)
`(a b ,((lambda (a) `(test . ,a)) 69) c d)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define fib (lambda (c) (_fib 0 1 0 c)))
(define _fib (lambda (a b n c)
(if (= n c)
b
(_fib b (+ a b) (+ n 1) c))))
(define do (lambda (c f) (_do f '() 0 c)))
(define _do (lambda (f r n c)
(if (= n c) r
(_do f (cons (f n) r) (+ n 1) c))))
;; comment
;; another comment
;; fib(13)
;(do 10 (lambda (n) (display (fib n)))) ; comment
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(define +list (lambda (l) (_+list l 0)))
(define _+list (lambda (l acc)
(if (nil? l)
acc
(_+list (cdr l) (+ acc (car l))))))
(+list '(10 12))
(define * (lambda (a n) (+list (do n (lambda (n) a)))))
(* 9 7)
(define reverse (lambda (l) (_reverse l '())))
(define _reverse (lambda (l n)
(if (nil? l) n
(_reverse (cdr l) (cons (car l) n)))))
;; (+list (do 100 (lambda (n) (fib n))))
(reverse (do 100 (lambda (n) (fib n))))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; don't know about a good example
(defmacro m (a) `(+ ,a 57))
(m (+ 1 2))
(define cadr (lambda (l) (car (cdr l))))
(define map (lambda (fn list)
(if (nil? list)
list
(cons (fn (car list)) (map fn (cdr list))))))
(map (lambda (n) (+ n 1)) '(1 2 3))
(defmacro let (vars body)
`((lambda ,(map car vars) ,body) . ,(map cadr vars)))
(let ((a 8) (b 9)) (+ a b))
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