dependent macros

controllers.application.js

import Ember from 'ember';
import { filterBy, readOnly, setDiff } from '@ember/object/computed';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  things: readOnly('model'),
  truths: filterBy('things', 'is', true),
  untruths: setDiff('things', 'truths'),

  init() {
    setInterval(() => { 
      let rand = Math.floor(Math.random() * Math.floor(2));
      
      this.model.pushObject({ 
        id: new Date().toTimeString().slice(0, 8), 
        is: (rand == 1)
      }); 
    }, 2000);
  }
});

routes.application.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return [{ id: 'asdf', is: true}, { id: 'qwer', is: false}];
  }
});

templates.application.hbs

<h2>Conjecture</h2>
<ul>
  {{#each things as |thing|}}
    <li>
    thing {{thing.id}} | <b>{{thing.is}}</b>
    </li>
  {{/each}}
</ul>

<h2>Truths</h2>
<ul>
  {{#each truths as |truth|}}
    <li>thing {{truth.id}}</li>
  {{/each}}
</ul>

<h2>Untruths</h2>
<ul>
  {{#each untruths as |untruth|}}
    <li>thing {{untruth.id}}</li>
  {{/each}}
</ul>

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}