crossfilter replace POC

replace_poc.js

  function replace(newData) {
 
            var nindex = crossfilter_range(newData.length);
 
            // Update indexes.
            removeDataListeners.forEach(function(l) {
                l(nindex);
            });
 
            // Remove all matching records from groups.
            filterListeners.forEach(function(l) {
                l(0, [], data);
            });
 
            var oldDataLength = data.length;
            data = newData;
            n = newData.length;
            filters = crossfilter_array8(n);
 
            dataListeners.forEach(function(l) {
                  l(newData, oldDataLength, n);
            });
 
            return crossfilter;
        }