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- Subject: Re: [manual] ipairs vs. #
- From: Dirk Laurie <dirk.laurie@...>
- Date: Wed, 27 Jan 2016 20:34:21 +0200
2016-01-27 19:11 GMT+02:00 Stephan Hennig <email@example.com>:
> The fact that iterating over table elements via ipairs and iterating over
> table indices 1 to #t are not equal operations has been discussed on
> this list before. But it is neither mentioned in the section describing
> ipairs nor in the section describing the # operator. I think this fact
> deserves more visibility in the manual.
The manual is very cute at saying enough, but only barely.
In this case it says
will iterate over the key–value pairs (1,t), (2,t), ..., up to the
first nil value.
The notation t implies that __index is respected, the failure to
mention #t means that __len is ignored. Terse, but it has always
been like that.
You say this is actually documented in "Changes to the libraries"?
That's being absolutely verbose, then!