/**
 * Standard filtering subroutines that operate on feature objects.
 */
define([
       ],
       function(
       ) {

return {
    plusStrand: function(feature)  {
        var strand = feature.get('strand');
        if (strand == 1 || strand == '+')  { return true; }
        else  { return false; }
    },
    minusStrand: function(feature)  {
        var strand = feature.get('strand');
        if (strand == -1 || strand == '-')  { return true; }
        else  { return false; }
    },
    all: function(feature) {
        return true;
    },
    none: function(feature)  {
        return false;
    }
};
});