Ember.computed.not()

A computed property that returns the inverse boolean value of the original value for the dependent property.

Example

let User = Ember.Object.extend({
  isAnonymous: Ember.computed.not('loggedIn')
});

let user = User.create({loggedIn: false});

user.get('isAnonymous'); // true
user.set('loggedIn', true);
user.get('isAnonymous'); // false