Intermediate property

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  mockObjects: [
    {
      'k': {
        'e': 3
      }
    },
    {
      'k': {
        'e': 5
      }
    }
  ],
  
  appName: 'Ember Twiddle',
  
  mockObjStr: Ember.computed('mockObjects', function() {
		return JSON.stringify(this.mockObjects);
  }),
  
  depOne: Ember.computed.filter('mockObjects.@each.k', obj => obj.k.e > 0),
  
  depOneStr: Ember.computed('depOne', function() {
    return JSON.stringify(this.depOne);
  }),
  
  mockObjKs: Ember.computed.mapBy('mockObjects', 'k'),
  
  depTwo: Ember.computed('mockObjKs.@each.e', function() {
    return JSON.stringify(this.mockObjKs);
	}),
  
  depThree: Ember.computed('mockObjects.@each.k', 'mockObjKs.@each.e', function() {
    // Uncomment this one: 
    const getDepTwo = this.get('mockObjKs');
    return JSON.stringify(this.mockObjects.filter(obj => obj.k.e > 0));
  }),
  
  actions: {
    updateThing() {
			const a = this.mockObjects[0];
      Ember.set(a, 'k.e', 0);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
mockObjs: {{mockObjStr}}
<br>
dep 1: {{depOneStr}}
<br>
dep3: {{depThree}}
<br>

<button {{action "updateThing"}}>Update</button>

twiddle.json

{
  "version": "0.15.0",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.2.2",
    "ember-template-compiler": "3.2.2",
    "ember-testing": "3.2.2"
  },
  "addons": {
    "ember-data": "3.2.0"
  }
}