Function Composition in JS

gistfile1.js

  // Elegant composition 
  // src: http://news.ycombinator.com/item?id=3512011
  function compose(funcA, funcB){
       return function(x, result, error){
           // Data flows right-to-left over composition, so "do x, then do y"
           // is written: "do y" o "do x"
           funcB(x, function(x_){ funcA(x_, result, error) }, error);
       }
   }

   

    cached_lookup = compose(funcTwo, funcOne);
    cached_lookup(1234, do_next_step, handle_error);