how do you use table.unpack?

[subv0x]

how do you use unpack or table.unpack ? (does it work in Ctrlr?)

[dnaldoog]

how do you use unpack or table.unpack ? (does it work in Ctrlr?)

I think table.unpack() is only in lua 5.2 so you need to use unpack() because Ctrlr uses lua 5.1 ;)

[subv0x]

i found this:

http://lua-users.org/lists/lua-l/2013-10/msg00534.html

The Lua website says that "Function unpack was moved into the table library and therefore must be called as table.unpack." I have Lua 5.2.2 and 'unpack' still works for me. Did they keep it around for back compatibility? Which one should I use?

unpack is only present in 5.2 of it's compiled with 5.1 compatibility enabled (i.e. LUA_COMPAT_UNPACK or LUA_COMPAT_ALL were defined).

If you're writing solely for 5.2, use table.unpack. If you're writing for 5.1 and 5.2, you can use local unpack = unpack or table.unpack at the top of the file and then call it as unpack.

so '''unpack()''' how do we use that?

[subv0x]

now... is there a pack(table, item?) eg: to correspond to table.pack( table, item?) - been looking at various table. etc. functions.

[dnaldoog]

What do you mean by table.pack?

Do you mean add variables or values into a table?

You would need table.insert() to do that:

I’m not aware of a function like:

t={}
a,b,c=table.pack(t)

[dnaldoog]

You could write your own. Something like:

local t={2,3,4}
local a,b,c=unpack(t)

function pack(...)
    local t = {}
    for i, v in ipairs(arg) do
        t[i] = v
    end
    return t
end

local t1=pack(a,b,c)

table pack.zip

[subv0x]

i saw table.pack when i was looking at unpack( ...) - which was something chatGPt suggested :D -
so i did a quick check of references online. obviously table.insert() but can you do a straight array-insert with something like
(a,b,c,d) table.insert (table) ? or you have to iterate?

i like unpack(table) anyway.

asked chatGPT for a list of table. functions and got:

table.insert(table, pos, value): Inserts value at position pos in table, shifting any elements after pos to higher indices.
table.remove(table, pos): Removes and returns the element at position pos from table, shifting any elements after pos to lower indices.
table.concat(table, sep): Concatenates all elements of table into a string, with an optional separator sep between each element.
table.sort(table, comp): Sorts the elements of table in ascending order, using an optional comparison function comp.
table.unpack(table): Returns all elements of table as individual values. (Lua 5.2 and later, use unpack() for Lua 5.1)
table.copy(table): Creates a shallow copy of table.
table.deepcopy(table): Creates a deep copy of table, including nested tables.
table.getn(table): Returns the length of table. (Deprecated in Lua 5.2; use #table instead)
table.foreach(table, func): Iterates over key-value pairs in table, calling func(key, value) for each pair.

any more?

[dnaldoog]

You have to iterate or use the force!

I'll bet that function I wrote is super fast anyway!

🤣