Lua add two tables

Question

x = {1, 2, 3}
y = {4, 5, 6}
z = x + y

I have two tables x and y and just want to create a third one which is just the elements of them two (not sorted). I use the above code in an effort but this gives error input:3: attempt to perform arithmetic on a table value (global 'x')...

Answer 1

It seems you want to concatenate the two tables to obtain {1, 2, 3, 4, 5, 6}.

There is no builtin function or operator for that. You can use this code:

z = {}
n = 0
for _,v in ipairs(x) do n=n+1; z[n]=v end
for _,v in ipairs(y) do n=n+1; z[n]=v end

If you want to use the syntax z = x + y, then set an __add metamethod. (But perhaps a __concat metamethod is more adequate for your meaning.)