code: function(expression){
        var t = this,
            value = null;
  
        // Evaluate the expression
        try {
          value = eval(expression);
        } catch (e) {
          throw new Error('Unable to evaluate: ' + expression);
        }
  
        // Return the value
        return value;
      }
docs: Evaluate an expression, returning the raw results
  
  @protected
  @method _evaluate
  @param expression {String} Expression to evaluate
  @return value {Mixed} Returns the expression value