Lua return multiple values as arguments

Question

I have a function (that I cannot change) returning multiple values :

function f1()
    ...
    return a, b
end

and another function (that I cannot change) taking multiple arguments :

function f2(x, y, z)
    ...
end

is there a way to do :

f2(f1(), c)

and have x be a, y be b and z be c ?

Answer 1

You could use intermediate results

local a, b = f1()
f2(a, b, c)

Answer 2

You can't do it in one line because f2(f1(),c) adjusts the results returned by f1 to a single value.

Answer 3

You can use a table as a helper:

tbl={f1()}
tbl[3]=c
f2(unpack(tbl))