crumbly-6.js

  _lookupBreadCrumb(routeNames, filteredRouteNames) {
    const defaultLinkable = get(this, 'linkable');
    const breadCrumbs = map(filteredRouteNames, (name, index) => {
      const path = this._guessRoutePath(routeNames, name, index);
      let breadCrumb = this._lookupRoute(path).getWithDefault('breadCrumb', undefined);
      const breadCrumbType = typeOf(breadCrumb);

      if (breadCrumbType === 'undefined') {
        breadCrumb = {
          path,
          linkable: defaultLinkable,
          title: classify(name)
        };
      } else if (breadCrumbType === 'null') {
        return;
      } else {
        setProperties(breadCrumb, {
          path,
          linkable: breadCrumb.hasOwnProperty('linkable') ? breadCrumb.linkable : defaultLinkable
        });
      }

      return breadCrumb;
    });

    return emberArray(filter(breadCrumbs, (breadCrumb) => {
      return typeOf(breadCrumb) !== 'undefined';
    }));
  }