Re: Predicate for a string representing an integer
On 05/30/17 11:13, Jan-Peter Voigt wrote: I doubt that checking all characters in the string are in the range '0'-'9' is faster then string->number. Don't forget the optional leading hyphen, base specifiers (#x, #o, #d, #b), etc. However, do keep in mind that (integer? (string->number x)) accepts "2/2", "1.0", "1e10", and even "1.0001" as integers, which might not be what you want. ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Re: Predicate for a string representing an integer
Hi Urs, the functions used are built-in so I'd probably also do it (almost) that way. But I'd strongly recommend to test if obj is a string first: #(define (integer-string? obj) (and (string? obj)(integer? (string->number obj Otherwise the predicate fails with an error (not false) if the argument is something else ... for example an integer. I doubt that checking all characters in the string are in the range '0'-'9' is faster then string->number. Jan-Peter Am 30.05.2017 um 10:47 schrieb Urs Liska: Hi all, I've found this function in my code: % Returns true if obj is a string representation of an integer #(define (integer-string? obj) (integer? (string->number obj))) and I have the impression there should be a better way with more built-in functionality to do it. Any suggestions, or should I simply leave it at that? Urs ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
Predicate for a string representing an integer
Hi all, I've found this function in my code: % Returns true if obj is a string representation of an integer #(define (integer-string? obj) (integer? (string->number obj))) and I have the impression there should be a better way with more built-in functionality to do it. Any suggestions, or should I simply leave it at that? Urs -- u...@openlilylib.org https://openlilylib.org http://lilypondblog.org ___ lilypond-user mailing list lilypond-user@gnu.org https://lists.gnu.org/mailman/listinfo/lilypond-user
