t3x.org / sketchy / library / c-ciltp.html
SketchyLISP
Reference
  Copyright (C) 2006
Nils M Holm

char-ci<?

Conformance: R5RS

Purpose: Case-insensitively test whether two chars are in lexically ascending order.

Arguments:
X - char
Y - char

Model:

(define (char-ci<? x y)
  (< (char->integer (char-downcase x))
     (char->integer (char-downcase y))))

Implementation:

; This function is a primitive function.

Example:

(char-ci<? #\a #\B) 
=> #t

See also:
char<?, char-ci=?, char-ci>?, char-ci<=?, char-ci>=?, string<?, equal?.