itemDetail

-- Video of it in action: https://www.youtube.com/watch?v=kTzkTcCTVZg&list=PL9XabkF_A5YhxWelwj2yzjcegL9E0WLw6

for i = 1, 16 do --checks all of the turtles slots
  for k, v in pairs(turtle.getItemDetail(i)) do --read the table that gets generated
   if k == "damage" and v ~= 0 then -- checks if the item is damaged
    turtle.select(i) --selects the slot with the damaged item
    turtle.drop() --drops the item
   end
  end
end