action passing

components.onboarding-card.js

import Ember from 'ember';

export default Ember.Component.extend({

});

components.selectable-icon.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',
  actions: {
  	onToggleSelection() {
    	alert('got onToggleSelection');
    }
  }
});

templates.application.hbs

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

{{#onboarding-card as |card|}}
	{{card.selectableIcon onCheckboxChanged=(action "onToggleSelection") }}
{{/onboarding-card}}
<br>
<br>

templates.components.onboarding-card.hbs

{{yield (hash
    selectableIcon=(
      component
      "selectable-icon"
      onCheckboxChanged=onCheckboxChanged
    )
  )
}}

templates.components.selectable-icon.hbs

{{yield}}
<input type="checkbox" {{action onCheckboxChanged}} />

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1"
  }
}