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- Subject: Re: [feature request] how about modify the `table.unpack` function to make `table.unpack(table.pack(f()) === f()` equivalent
- From: Xavier Wang <weasley.wx@...>
- Date: Thu, 5 Jan 2017 14:00:22 +0800
2017-01-04 12:24 GMT+08:00 聂威 <email@example.com>:
> dear list,
> I have noticed that `table.unpack(list [,i [, j]])` will NOT regards the `n`
> field in the `list` table,
> I know I can write it like this:
> table.unpack(list, 1, list.n)
> but will it be a good idea to make it read `n` field in table.unpack?
> thanks and happy new year!
> table.pack in Lua 5.3 manual:
> table.pack (···)
> Returns a new table with all parameters stored into keys 1, 2, etc. and with
> a field "n" with the total number of parameters. Note that the resulting
> table may not be a sequence.
So I think both change table.pack and table.unpack will work:
table.pack(...) -> t, n
table.unpack(t [, m], n) -> ...
so table.pack return two value, a table and a length, and table.unpack
could accept two or three arguments.
for unpack if only n given, the 1..n index in table will unpack, and
if m and n given, the m..n index in table will unpack.