local array1 = {1, 2, 3}
local array2 = {4, 5, 6}

-- Concatenate to a new array.
local array3 = {}
table.move(array1, 1, #array1, 1, array3)
table.move(array2, 1, #array2, #array3 + 1, array3)
print(array3:concat(", "))

-- Merge second into first array.
table.move(array2, 1, #array2, #array1 + 1, array1)
print(array1:concat(", "))