How to call a function from global API in Angular expressions?

Question

Angular.js provides a banch of global functions like angular.lowercase, angular.isArray etc.

Suppose I have a string in my scope:

function MyController($scope) {
   $scope.myString = "TEST"
}

Calling angular.lowercase has no effect:

{{lowercase(myString)}}
{{angular.lowercase(myString)}}

How can I call such function in my template?

UPDATE

Example with angular.isArray

<div ng-show="isArray(myVar)">...</div>

Answer 1

The expression in the {{}} is not actual javascript although it looks that way - it's an angularjs expression. For this reason not everything will be available to you.

charlietfl is right that your particular case can be solved with an existing filter. Not every angular.* function is exposed this way, however, in which case you should create your own custom filters.

Filters are cleanest but as a dirty workaround you could also just have the following line in your controller:

$scope.lowercase = angular.lowercase;  // not angular.lowercase()