Re: [manual] ipairs vs. #
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- Subject: Re: [manual] ipairs vs. #
- From: Dirk Laurie <dirk.laurie@...>
- Date: 2016年1月27日 20:34:21 +0200
2016年01月27日 19:11 GMT+02:00 Stephan Hennig <sh-list@posteo.net>:
> 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[1]), (2,t[2]), ..., up to the
first nil value.
The notation t[1] 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!