> On Dec 11, 2015, at 5:27 PM, David Storrs <[email protected]> wrote: > > > > On Fri, Dec 11, 2015 at 1:53 PM, Matthew Butterick <[email protected] > <mailto:[email protected]>> wrote: > PS. I'm assuming that you're using `eq?` here in deliberate preference to > `equal?`. Because `eq?` is not reliable for string comparisons. > > Ah. No, I did not realize that. I thought that Racket worked on a flyweight > pattern where all strings of the same characters were eq? -- isn't that what > interned symbols are about?
Some examples: > (eq? "foo" "foo") #t > (eq? "foo" (symbol->string 'foo)) #f > (eq? (symbol->string 'foo) (symbol->string 'foo)) #f > (eq? "foo" (datum-intern-literal (symbol->string 'foo))) #t So, string constants produced by the reader seem to be eq?, but strings produced by any other operation, such as symbol->string, string-append, format, etc, will not be. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
