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> On 1/1/11, David J. Slate <> wrote:
>> When I first saw how the '#' operator applied to tables, it seemed a
>> bit of an anomaly.  In a language as elegant as Lua, I expected a
>> single-character core operator like '#' to have a simple, general, and
>> intuitively predictable meaning when applied to the data types for
>> which it's relevant.  As applied to strings it does, returning
>> unambiguously the length of the string.  But applied to tables, it
>> produces a sensible result only for arrays or lists with integer
>> indices beginning with 1 and without "holes".  Intuitively, I would
>> have expected a "length operator" as applied to an associative table
>> to produce a count of its keys, regardless of what kind of table it
>> was.  There could of course be an appropriately-named function that
>> worked like '#' actually does.
> +1
> Yes, a count of keys would be reasonable, O(1), and if one had been
> careful with his tables, would accidentally coincide with #'s current
> semantics