Ember.computed.bool()

A computed property that converts the provided dependent property into a boolean value.

let Hamster = Ember.Object.extend({
  hasBananas: Ember.computed.bool('numBananas')
});

let hamster = Hamster.create();

hamster.get('hasBananas'); // false
hamster.set('numBananas', 0);
hamster.get('hasBananas'); // false
hamster.set('numBananas', 1);
hamster.get('hasBananas'); // true
hamster.set('numBananas', null);
hamster.get('hasBananas'); // false