SketchyLISP Reference |
Copyright (C) 2007 Nils M Holm |
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Conformance: R5RS Scheme
Purpose: Test whether a sequence of strings is in lexically ascending order.
Arguments:
X - string
Y... - strings
Implementation:
(define string<? (letrec ((lt? (lambda (x y) (cond ((null? x) (not (null? y))) ((null? y) #f) ((char<? (car x) (car y)) #t) ((char>? (car x) (car y)) #f) (else (lt? (cdr x) (cdr y))))))) (predicate-iterator (lambda (x y) (lt? (string->list x) (string->list y))))))
Example:
(string<? "abc" "xyz" "zzz") => #t
See also:
string-ci<?,
string=?,
string>?,
string<=?,
string>=?,
char<?,
equal?.
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