Function encaptulation in classes

local _M = {}

function _M:getImage(item)
   local imgSize = 25
   local inventoryBox = display.newImageRect( item, imgSize, imgSize )

   local function onTouch(event)
     if "ended" == event.phase then
      print("touched rectangle")
     end
   end

   inventoryBox:addEventListener( "touch", onTouch )
   return inventoryBox
  end

  local xTemp = spawnObject()

return _M