(set (quote define) (macro (name val rest)
(list
- 'progn
+ 'begin
(list
'set
(list 'quote name)
(defun caddr (l) (car (cdr (cdr l))))
-(defun nth (list n)
- (cond ((= n 0) (car list))
- ((nth (cdr list) (1- n)))
- )
+(define list-tail (lambda (x k)
+ (if (zero? k)
+ x
+ (list-tail (cdr x (- k 1)))
+ )
+ )
+ )
+
+(define list-ref (lambda (x k)
+ (car (list-tail x k))
+ )
)
; simple math operators
(odd? 3)
(odd? -1)
-(define exact? number?)
-(defun inexact? (x) #f)
-
; (if <condition> <if-true>)
; (if <condition> <if-true> <if-false)
(let ((x 1)) x)
+(define let* let)
; boolean operators
(define or (lexpr (l)
'(54 0 37 -3 245 19))
#t))
+(define repeat (macro (count rest)
+ (list
+ let
+ (list
+ (list '__count__ count))
+ (append
+ (list
+ while
+ (list
+ <=
+ 0
+ (list
+ set!
+ '__count__
+ (list
+ -
+ '__count__
+ 1))))
+ rest))))
+
;(define number->string (lexpr (arg opt)
; (let ((base (if (null? opt) 10 (car opt)))
;