Success handler code which merges results from Office 365 and on-premises sites (*if hybrid SharePoint is configured*).

CSOMSearch_MergeResults.js

function onCustomInterleavedSearchQuerySuccess() {
    var mergedResults = new Array();
    var fakeResultTable = {};

    $.each(results.m_value.ResultTables, function (index, resultTable) {
        if (resultTable.TableType === 'SpecialTermResults') {
            // show best bets if we have any..
            renderBestBetsResultTable(this)
        }
        else {
            $.each(resultTable.ResultRows, function (index2, resultRow) {
                var item = new COB.SharePoint.HybridSearch.GenericResult.SearchResult(resultRow);
                // filtering on items which have a last modified time (for sorting by last modified)..
                if (item.LastModifiedTime != null) {
                    mergedResults.push(item);
                }
            });
        }
    });

    // now sort (using underscore.js)..
    // OPTION 1: enable this section to sort by rank (descending) [but remember, this is not valid across two SP instances, e.g. O365 and on-prem]..
    var sortedResults = _.sortBy(mergedResults, function (item) {
        // multiply Rank by -1 to get a DESC order sort..
        return (item.Rank * -1);
    });
    // OPTION 2: or enable this section to sort by last modified time..
    //var sortedResults = _.sortBy(mergedResults, function (item) {
    //    // multiply milliseconds by -1 to get a DESC order sort..
    //    return (item.LastModifiedTime != null) ? (item.LastModifiedTime.getTime() * -1): 0;
    //});
    // OPTION 3: enable this line to sort by rank (ascending) - mainly to demonstrate how to do this with underscore.js [but remember, this is not valid across two SP instances, e.g. O365 and on-prem]..
    //var sortedResults = _.sortBy(mergedResults, 'Rank');


    // now render sortedResults..
    fakeResultTable.ResultRows = sortedResults;
    fakeResultTable.TableType = 'merged with custom code';
    renderResultTable(fakeResultTable);
}