Which version do you prefer? (find is lodash.find for IE11)

version-a.js

function getHierarchicalRefinement(state, attributeName, name, resultsFacets) {
  var facet = find(resultsFacets, {name: attributeName});
  var facetDeclaration = state.getHierarchicalFacetByName(attributeName);
  var splitted = name.split(facetDeclaration.separator);
  var configuredName = splitted[splitted.length - 1];

  for (var i = 0; facet !== undefined && i < splitted.length; ++i) {
    facet = find(facet.data, {name: splitted[i]});
  }

  var count = get(facet, 'count');
  var exhaustive = get(facet, 'exhaustive');
  return {
    type: 'hierarchical',
    attributeName: attributeName,
    name: configuredName,
    count: count || 0,
    exhaustive: exhaustive || false
  };
}

version-b.js

function getHierarchicalRefinement(state, attributeName, name, resultsFacets) {
  var facetDeclaration = state.getHierarchicalFacetByName(attributeName);
  var separator = state._getHierarchicalFacetSeparator(facetDeclaration);
  var split = name.split(separator);
  var configuredName = split[split.length - 1];
  var rootFacet = find(resultsFacets, {name: attributeName});

  var facet = split.reduce(function(intermediateFacet, part) {
    var newFacet =
      intermediateFacet && find(intermediateFacet.data, {name: part});
    return newFacet !== undefined ? newFacet : intermediateFacet;
  }, rootFacet);

  return {
    type: 'hierarchical',
    attributeName: attributeName,
    name: configuredName,
    count: (facet && facet.count) || 0,
    exhaustive: (facet && facet.exhaustive) || false
  };
}