Computed with Set

controllers.application.js

import Ember from 'ember';

const {
  computed: { or }
} = Ember;

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  
  isSunny: false,
  isRainy: false,
  
  myComputed: or('isSunny', 'isRainy'),
  
  actions: {
    toggleProperty(property) {
      const val = this.get(property);
      this.set(property, !val);
    }
  }
});

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}

Is Sunny?: {{isSunny}} <button {{action "toggleProperty" "isSunny"}}>Toggle isSunny</button>
<br>
<br>
Is Rainy?: {{isRainy}} <button {{action "toggleProperty" "isRainy"}}>Toggle isRainy</button>
<br>
<br>
Computed Value: {{myComputed}} <button {{action "toggleProperty" "myComputed"}}>Toggle myComputed</button>

<br>
<br>

twiddle.json

{
  "version": "0.13.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.16.2",
    "ember-template-compiler": "2.16.2",
    "ember-testing": "2.16.2"
  },
  "addons": {
    "ember-data": "2.16.3"
  }
}