test.js

var markers = MarkerService.getAllMarkers();

$scope.map.markers = _.reduce(filters, function(previousVal, filter) {
    return filter.filterFunc(previousVal);
}, markers);
console.log('Went from ' + markers.length + ' to ' + $scope.map.markers.length);

var sampleFilter = {
    name      : "Order Completion",
    id        : "completion",
    filterFunc: function (markers) {
        var complete   = _.find(this.values, {name: "Complete"}).value;
        var incomplete = _.find(this.values, {name: "Incomplete"}).value;
        return _.filter(markers, function (marker) {
            var isComplete = marker.location.complete || false;
            return isComplete && complete || incomplete && !isComplete;
        });
    },
    values    : [
        {name: "Complete", value: true},
        {name: "Incomplete", value: true}
    ]
}