ng-class one time binding

Question

I'm wondering if it's possible to have a ng-class with class one time binded and class which are evaluated each digest cycle.

<div ng-class="{'one_time_binded_class': isMonkey(), 'not_one_time_binded_class': isUnicorn()}"></div>

I know I can one time bind the complete ng-class with ng-class="::{...}" but my need is to one time bind a particular expression

Of course, this thing doesn't work :

<div ng-class="{'my_static_class': ::isMonkey(), 'my_dynamic_class': isUnicorn()}"></div>

Is there a way to do it ?

Answer 1

Method 1:

class="some-class {{::expression ? 'my-class' : ''}}" 

Method 2:

ng-class="::{'my-class': expression}"