bind(this)).forEach(this.hideFragment);
      this.fragments.filter(this.currentExitFragments.bind(this)).forEach(this.showFragment);
      return true;
    };
    
    FragmentsController.prototype.currentEnterFragments = function(fragment) {
      return fragment.enter === this.steps[this.currentStep];
    };
    
    FragmentsController.prototype.currentExitFragments = function(fragment) {
      return fragment.exit === this.steps[this.currentStep];
    };
    
    FragmentsController.prototype.showFragm