reusable conditionals in angular

Great post! I have never seen a filter used in that way before. I am going to throw my 2 cents in, hopefully it helps people see the other side of the fence.

I feel like that kind of logic should be held in a service. Filters are used mainly for processing and outputting readable data if I am not mistaken. I feel like if you need to do anything more complicated than checking if a variable is truthy, it should be built into a service .

I would build service to handle the logic portion, while exposing just a boolean in your $scope.

app.service('adminViewService', function(user){
  // This service only exists to process data before exposing it to the controller. 
  // All logic would be here, making the controllers very small, just being service calls.
  var test = this;
  test.isAdmin = {
    lastChecked: DateTime,
    data: Boolean
  }

  test.checkIfAdmin = function(){
    test.isAdmin.lastChecked = Date.now();
    if(user.roles.indexOf('admin') !== -1){
      test.isAdmin.data = true;
    }else{
      test.isAdmin.data = false;
    }
  }
})

I could very well be wrong though, what do you think?

@Kadajett

Services are the most common way to proceed. Actually I generally create a service then use the service in my filter.

Using filters spares a lot of:
- inject service
- attach to controller
- call method in view

I've never seen anyone using filters this way either but I'd recomment it: it feels natural

Actually I'm working on videos for egghead.io maybe it would be published there.

I will have to give it a try :) I am always down for finding ways to make my code more natural and readable.

Now that I am taking a look at it, I can see myself knowing exactly what is going on. In that sense, it is very nice. Though, I would love to see this in action with a ton of elements. Since filters are only called their input changes, I bet it would be just as fast as a controller function.

Brain food :P

Good job man. I would give you another like if could :P