anchor.diff:      return null;
     }
   };
  +
   
   
   var StudentsTable = React.createClass({
  
positive.code: });
  
  
  // Returns a list of Filters
  function parseFiltersHash(hash) {
    var pieces = _.compact(hash.slice(1).split('&'));
  
negative.code:     window.history.pushState({}, null, this.filtersHash());
    },
  
    filteredStudents: function() {
      return this.state.filters.reduce(function(filteredStudents, filter) {
        return filteredStudents.filter(filter.filterFn);
  