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MathGroup Archive 2000

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Re: StringQ?

  • To: mathgroup at
  • Subject: [mg25454] Re: StringQ?
  • From: Jens-Peer Kuska <kuska at>
  • Date: Sun, 1 Oct 2000 02:44:38 -0400 (EDT)
  • Organization: Universitaet Leipzig
  • References: <8r1bae$>
  • Sender: owner-wri-mathgroup at


what does  it better than _String ?? and for what it is good
for ?
It seems always better (and faster) to look for the head of a data
type than to ask with a function if Head[a]===String


"J. Leko" wrote:
> While working on a problem in Mathematica 4.02, I happened to use a
> function StringQ. It just seemed like a logically named Mathematica
> function, and it followed the usual naming convention. I was surprised to
> learn, however, that this function is referenced no where in the
> Mathematica documentation. What is even more surprising is that it seems
> to have existed since at least version 2.2 (although I did see it
> referenced in Blachmann's "Mathematica Quick Reference version 2")!
> Is this an oversight on the part of WRI? Perhaps it was mistakenly left
> out of the docs in earlier versions. I can't imagine this being one of
> those "undocumented functions" wwhich are subject to change/removal from
> the language.
> J. Leko
> Please e-mail replies to leko*j at and remove the *

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