luaunpack.lua

do
  local function _lua_unpack(t, i, j)
    if i <= j then
      return t[i], _lua_unpack(t, i + 1, j)
    end
  end
  
  function lua_unpack(t, i, j)
    assert(type(t) == 'table','bad argument #1')
    assert(j == nil or type(j) == 'number','bad argument #3')
    if not i then i = 1 end
    if not j then j = #t end
    if j < i then return end
    return _lua_unpack(t, i, j)
  end
end