action in an action

components.comp-one.js

import Ember from 'ember';

export default Ember.Component.extend({
  init() {
    this._super(...arguments);
    this.set('toggle', (f) => {
      f();
    });
  }
});

components.comp-two.js

import Ember from 'ember';

export default Ember.Component.extend({
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle'
});

templates.application.hbs

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

<p>"two in one"</p>
{{#comp-one as |cp1|}}
{{#comp-two as |cp2|}}
<button {{action cp1.toggle cp2.toggle}}>Toggle</button>
{{/comp-two}}
{{/comp-one}}
<hr>

<p>"one in two"</p>
{{#comp-two as |cp1|}}
{{#comp-one as |cp2|}}
<button {{action cp1.toggle cp2.toggle}}>Toggle</button>
{{/comp-one}}
{{/comp-two}}

<br>
{{outlet}}
<br>
<br>

templates.components.comp-one.hbs

<h2>Component One</h2>

{{yield (hash toggle=toggle)}}

templates.components.comp-two.hbs

<h3>Component Two</h3>

{{#if enabled}}
<p>Totes ON</p>
{{else}}
<p>Totes off</p>
{{/if}}

{{yield (hash toggle=(action (mut enabled) (if enabled false true))) }}

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"
  }
}