Re: string-match-p [was Re: [Emacs-diffs] trunk r113149: * ido.el (ido-read-internal): Fix bug#14620.]

[Juanma Barranquero]

On Mon, Jun 24, 2013 at 6:12 PM, Glenn Morris <address@hidden> wrote:

> If I don't care about the match data one way or the other (as here, I
> assume) why is string-match-p preferable? Is it faster or something?

If we consider (as we do) that save-match-data is expensive enough
that we only do when necessary, I'd assume not registering the match
data is faster than registering it, yes.

But anyway, the main reason is legibility. If you encounter
string-match-p or looking-at-p you can be confident that they are
being used as predicates and the following code does not depend on the
match data. That is a net gain IMO.

   J