JavaScript FUN

filtering.js

  filterSites = (sites, terms) => {
    var REDUCERS = {
      'AND': (acc, cur) => acc && cur,
      'OR': (acc, cur) => acc || cur
    };

    var filtered_sites = Object.values(sites).filter((s) => {
      if (s && typeof s == 'object'){
        var props = s.properties;
        var truths = terms.map((term, idx) => {
          var key = term[1];
          var termFilter = this.typeFilter[term[0]];
          var searchTerm = term[2];
          var reducer = term[3];
          return [(
              typeof props == 'object' &&
              props != null &&
              props.hasOwnProperty(key) &&
              termFilter(props[key], searchTerm)
          ), reducer];
        });
        return truths.reduce(
          (acc, cur) => REDUCERS[cur[1]](acc, cur[0]),
          [true, 'OR']
        );
      }
      return true;
    });
    return filtered_sites;
  };