loopThroughNextButton.js

    //Angularjs 1.1 looping though an array, for use with next and previous buttons. 
    //Two different styles that do the same thing

    //This loops through an array
    $scope.nextItem = (Number($routeParams.itemId) + 1) % $scope.artists.length;
    $scope.prevItem = (Number($routeParams.itemId) + $scope.artists.length - 1) % $scope.artists.length;
    
    //This is the same thing as above
    if ($routeParams.itemId > 0) {
      $scope.prevItem = Number($routeParams.itemId) - 1;
    } else {
      $scope.prevItem = $scope.artists.length - 1;
    }
   
    if ($routeParams.itemId < $scope.artists.length-1) {
      $scope.nextItem = Number($routeParams.itemId) + 1;
    } else {
      $scope.nextItem = 0;
    }