title: How to use string as variable name in lua
body: <p>Please, i got code in lua(love2d):</p>
  
  <pre><code>nn = love.graphics.newImage'texture.png'
  
  _1_1_cell = {
      _2_2_grid = {
          wall = { 
              texture = nn 
          }
      }
  }
  
  function drawGrid( ... )
      local rr, tt, oo, pp = 1, 1, 2, 2
      local hh = '_'..rr..'_'..tt..'_cell._'..oo..'_'..pp..'_grid.wall.texture'
      return
      --this should draw texture at certain position
      texture.quad( hh, {x,y}, {x,y}, {x,y}, {x,y} )
  end
  </code></pre>
  
  <p>problem is, it sends string instead of the texture data.
  when hh is printed, it displays: _1_1_cell._2_2_grid.wall.texture, which is correct and works when used directly instead of hh.
  so question is, how to convert the string to make it load what i need?
  thanks.</p>