<div dir="ltr">Technically, paths are path-string?.<div><br></div><div>Robby</div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Fri, Apr 19, 2013 at 1:57 PM, Asumu Takikawa <span dir="ltr"><<a href="mailto:asumu@ccs.neu.edu" target="_blank">asumu@ccs.neu.edu</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On 2013-04-19 20:18:53 +0200, Manfred Lotz wrote:<br> > path : path-string?<br> ><br> > [...]<br> <div class="im">><br> > I would expect that the first parameter path is a string and that the<br> > second parameter is an optional parameter denoting a file mode. Further<br> > I would assume that file->string returns a string containing the whole<br> > file.<br> ><br> > From this I'm wondering why there are predicates when for example I<br> > would expect strings?<br> <br> </div>Is the question about the `path` argument in particular? The<br> documentation here is just saying `path` should be any value that can<br> pass the `path-string?` predicate, which is a subset of the values that<br> pass `string?`.<br> <br> So for example "\0" is an invalid argument because<br> -> (path-string? "\0")<br> #f<br> <br> but "/tmp" is fine because<br> -> (path-string? "/tmp")<br> #t<br> <br> The documentation of `path-string?` has more details.<br> <br> Cheers,<br> Asumu<br> <div class="HOEnZb"><div class="h5">____________________<br> Racket Users list:<br> <a href="http://lists.racket-lang.org/users" target="_blank">http://lists.racket-lang.org/users</a><br> </div></div></blockquote></div><br></div>