table.new usage

rpaprocki · 2016-04-05T02:04:59+00:00

Hello! On Thu, Mar 31, 2016 at 2:53 AM, Guanglin Lv wrote: > I need to encode some string using URL style %XX encoding. but ngxescape_uri > doest enco...

table.new usage

rpaprocki

Hello!

I'm a bit unclear on how table.new() is implemented and should be used. My understanding is the behavior mirrors the C call lua_createtable:

"The new table has space pre-allocated for narr array elements and nrec non-array elements."

Can someone explain the difference between array elements and non-array elements in this context? Does this refer to the table being indexed by an integer vs. indexed by, say, a string or sub-tab, e.g., tab[1] vs tab["foo"]? I've looked at examples like lua-resty-logger-socket and lua-resty-redis but it's not overly clear and I haven't found any historical documentation on this mailing list to this respect (additionally, I can't seem to find any LuaJIT documentation on table.* calls).

agentzh

Hello!

On Mon, Apr 4, 2016 at 11:04 AM, Robert Paprocki wrote:
> I'm a bit unclear on how table.new() is implemented and should be used. My
> understanding is the behavior mirrors the C call lua_createtable:
>
> "The new table has space pre-allocated for narr array elements and nrec
> non-array elements."
>

Yes.

> Can someone explain the difference between array elements and non-array
> elements in this context? Does this refer to the table being indexed by an
> integer vs. indexed by, say, a string or sub-tab, e.g., tab[1] vs
> tab["foo"]?

Yes. Essentially like that.

Regards,
-agentzh

rpaprocki

Never let is be said that agentzh lacks brevity :D Thanks!

On Wed, Apr 6, 2016 at 8:38 AM, Yichun Zhang (agentzh) <age...@gmail.com> wrote:

Hello!

On Mon, Apr 4, 2016 at 11:04 AM, Robert Paprocki wrote:
> I'm a bit unclear on how table.new() is implemented and should be used. My
> understanding is the behavior mirrors the C call lua_createtable:
>
> "The new table has space pre-allocated for narr array elements and nrec
> non-array elements."
>

Yes.

> Can someone explain the difference between array elements and non-array
> elements in this context? Does this refer to the table being indexed by an
> integer vs. indexed by, say, a string or sub-tab, e.g., tab[1] vs
> tab["foo"]?

Yes. Essentially like that.

Regards,
-agentzh
.