Current/Active nav in AngularJS

NavMainCtrl.js

/*
 * NavMainCtrl
 * inspired by: http://stackoverflow.com/a/18894679/17252
 */
.controller('NavMainCtrl', ['$scope', '$location', function ($scope, $location) {
  $scope.isCurrentPath = function (paths) {
    // if we get a string instead of an array, turn into array with single string element
    if (_.isString(paths)) { paths = [paths]; }

    var i, len = paths.length;

    for (i = 0; i < len; i += 1) {
      if ($location.path().indexOf(paths[i]) === 0) {
        return true;
      }
    };
    return false;
  };
}]);

// HTML example (with string or array)
// <ul class="nav navbar-nav" ng-controller="NavMainCtrl">
//   <li ng-class="{ active: isCurrentPath('/dashboard') }"><a href="/app#/dashboard">dashboard</a></li>
//   <li ng-class="{ active: isCurrentPath([ '/projects', '/project' ]) }"><a href="/app#/projects">projects</a></li>
// <ul>