arrays - Angular js中两个$scope数组的差异

Question

有没有办法返回angularjs中作用域中存在的两个数组之间的差异

例如，

 $scope.user1 = ['a', 'b'];
 $scope.user2 = ['a', 'b', 'c', 'd'];

这两者的差异应该给我另一个作为
$scope.user3= ['c','d']

Answer 1

Underscore.js 对此有不同的方法。

http://underscorejs.org/#difference

$scope.user1 = ['a', 'b'];
$scope.user2 = ['a', 'b', 'c', 'd'];
$scope.user3 = _.difference($scope.user2, $scope.user1);