On 30 September 2011 13:26, G. Ken Holman
<gkholman(_at_)cranesoftwrights(_dot_)com> wrote:
At 2011-09-30 12:28 +0100, Andrew Welch wrote:
Regarding deep-equal(), the first bullet seems wrong: "If the two
sequences are both empty, the function returns true." It's well
defined, but doesn't seem to follow the rest of the spec where one
side is (). I wonder if it could easily be as well defined as
'false'.
But it is consistent with the requirement for the length of the two
sequences being the same (the second bullet says if the lengths are
different then return false()), and the third bullet doesn't come into play
because the lengths are zero.
So, I think the length property makes a good case for them being equal and
returning true().
Hmm the length thing is just a quick way of determining if they aren't
equal (without the cost of having to compare any values).
If () = () is false, then it's intuitive (to me) that deep-equal((),
()) is also false. The one liner saying that it should be true just
seems like it could easily say false.
--
Andrew Welch
http://andrewjwelch.com
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