On 2012-07-01, at 3:15 AM, John Cowan wrote: > Marc Feeley scripsit: > >> What is the rationale for digit-value ? Its usefullness seems limited. >> It could be used to parse decimal numbers and convert them to their >> numerical value. However, a more general procedure would be useful >> to parse numbers in any base: > > Its purpose is to determine for any digit character (not merely the > European digits 0-9) what its numeric value is. For example, > (digit-value #\x0663) => 3, because ٣ U+0663 is the Arabic-Indic digit 3. > Of course, if the implementation does not support this character, that > won't work.
I understand, but why is this useful? It seems rather special purpose (for parsing decimal numbers and converting them to their numerical value), but this is the purpose of the string->number procedure. Digit-value doesn't help me much in parsing hexadecimal. Perhaps I have missed some other use case. Moreover, as Peter Bex has pointed out, there is an inconsistency with read and string->number. As it is currently specified, I prefer not having it in the standard. Marc _______________________________________________ Scheme-reports mailing list [email protected] http://lists.scheme-reports.org/cgi-bin/mailman/listinfo/scheme-reports
