akhoury

augment = (base, extra, context) ->
  (->
    ->
      base.apply context or this, arguments_
      extra.apply context or this, arguments_
  )()

akhoury

    var augment = function (base, extra, context) {
        return (function () {
          return function () {
            base.apply(context || this, arguments);
            extra.apply(context || this, arguments);
          };
        })();
      };
      
    // usage  

akhoury

/* 
example: 

// [1,2,3,4,5,6,7,8] (must be a power of 2 length)

var arr = new Foldable([1, 2, 3, 4, 5, 6, 7, 8]);

arr.fold( [ "l", "r", "l" ] ); // left, right, left

// left