Re: [Chicken-hackers] substring

[felix . winkelmann]

>
> Hello all,
>
> Sjamaan and Mario on the channel brought up an interesting issue with
> substring=?. The current semantics check only to the length of the
> shorter string, so:
>
> (and (substring=? "foo" "foobar") (substring=? "foobar" "foo")) => #t
>
>
> I submit that this behaviour is conceptually broken.
>

It depends on the point of view. SRFI-13 does (according to my reading)
perform string comparison only on the given range (string=). The
MIT Scheme docs don't go into specifics, other's I couldn't find right now.

>
> substring is an instance of a subset operation, and
>

A string is an ordered collection, not a set.


felix