Lua - merge tables?

Question

I need to merge two tables, with the contents of the second overwriting contents in the first if a given item is in both. I looked but the standard libraries don\'t seem to

Answer 1

for k,v in pairs(second_table) do first_table[k] = v end

Answer 2

Doug Currie's answer is the simplest for most cases. If you need more robust merging of tables, consider using the merge() method from the Penlight library.

require 'pl'
pretty.dump(tablex.merge({a=1,b=2}, {c=3,d=4}, true))

-- {
--   a = 1,
--   d = 4,
--   c = 3,
--   b = 2
-- }