SketchyLISP Reference |
Copyright (C) 2007 Nils M Holm |
<<[string<?] | [Index] | [string=?]>> |
Conformance: R5RS Scheme
Purpose: Test whether a sequence of strings is in lexically non-descending order.
Arguments:
X - string
Y... - strings
Implementation:
(define string<=? (letrec ((le? (lambda (x y) (cond ((null? x) #t) ((null? y) #f) ((char<? (car x) (car y)) #t) ((char>? (car x) (car y)) #f) (else (le? (cdr x) (cdr y))))))) (predicate-iterator (lambda (x y) (le? (string->list x) (string->list y))))))
Example:
(string<=? "abc" "abc" "abx") => #t
See also:
string-ci<=?,
string<?,
string=?,
string>?,
string>=?,
char<=?,
equal?.
<<[string<?] | [Index] | [string=?]>> |