How to 'unpack' table into function arguments

Question

I'm trying to call a function in Lua that accepts multiple 'number' arguments

function addShape(x1, y1, x2, y2 ... xn, yn)

and I have a table of values which I'd like to pass as arguments

values = {1, 1, 2, 2, 3, 3}

Is it possible to dynamically 'unpack' (I'm not sure if this is the right term) these values in the function call? Something like..

object:addShape(table.unpack(values))

Equivalent to calling:

object:addShape(1, 1, 2, 2, 3, 3)

Apologies if this is a totally obvious Lua question, but I can't for the life of me find anything on the topic.

---

UPDATE

unpack(values) doesn't work either (delving into the method addShape(...) and checking the type of the value passed reveals that unpackis resulting in a single string.

Answer 1

You want this:

object:addShape(unpack(values))

See also: http://www.lua.org/pil/5.1.html

Here's a complete example:

shape = {
  addShape = function(self, a, b, c)
    print(a)
    print(b)
    print(c)
  end
}

values = {1, 2, 3}
shape:addShape(unpack(values))