A paginate filter in angularjs for maintaining pagination window with current page in the middle

Angularjs paginate filter

    .filter('paginate', function() {
        return function(arr, page, END, START, WINDOW) {

            if (typeof(START)==='undefined') START = 0;
            if (typeof(WINDOW)==='undefined') WINDOW = 5;

            var start = Math.floor(page - WINDOW/2);
            var end = Math.floor(page + WINDOW/2);

            if (start >= START && end <= END) {
                return (arr || []).slice(start, end);
            }

            if (start <= START) {
                start = START;
                end = START + WINDOW;
            } else {
                if (end >= END) {
                    start = END - WINDOW;
                    end = END;
                }
            }

            return (arr || []).slice(start, end);

        }
    });

// Usage
                <!-- PAGINATION START -->
                <nav class="center-block pagination-nav">
                    <ul class="pagination">
                        <li ng-class="{disabled: pagination.page == 1}">
                            <a aria-label="First" ng-click="setPage(1)">&laquo;</a>
                        </li>
                        <li ng-class="{disabled: pagination.page == 1}">
                            <a aria-label="Previous" ng-click="previousPage()">&lsaquo;</a>
                        </li>
                        <li ng-repeat="n in [] | range:pagination.total_pages | paginate:(pagination.page):(pagination.total_pages)"
                            ng-class="{active: n == pagination.page}"
                            ng-click="setPage(n)">
                            <a ng-bind="n"></a>
                        </li>
                        <li ng-class="{disabled: pagination.page == pagination.total_pages}">
                            <a aria-label="Next" ng-click="nextPage()">&rsaquo;</a>
                        </li>
                        <li ng-class="{disabled: pagination.page == pagination.total_pages}">
                            <a aria-label="Last" ng-click="setPage(pagination.total_pages)">&raquo;</a>
                        </li>
                    </ul>
                </nav>
                <!-- PAGINATION END -->