variable length of data passing down to a component

application.controller.js

import Ember from 'ember';

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

application.template.hbs

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

index.route.js

import Ember from 'ember';

const { RSVP } = Ember;

export default Ember.Route.extend({
  model() {
    return RSVP.hash({
      testChange: true,
      names: ['Ann', 'Ben', 'Joe', 'Rob'],
      likes: ['eating', 'playing', 'sleeping']
    })
  },
  
  actions: {
   	changeModel(type) {
      this.controller.get(`model.${type}`).shiftObject();
      this.controller.toggleProperty(`model.testChange`);
    }
  }
});

index.template.hbs

<button type="button" {{action "changeModel" "names"}}>
	Change Names
</button>

<button type="button" {{action "changeModel" "likes"}}>
	Change Likes
</button>

{{#vg-receiver
	data-names=model.names
  data-likes=model.likes
	test=model.testChange as |data|}}
  
  {{#each-in data as |key value|}}

    {{#each value as |item|}}
      <p>{{item}}</p>
    {{/each}}

    <hr>
  
  {{/each-in}}

{{/vg-receiver}}

twiddle.json

{
  "version": "0.4.16",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.1.0/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.1.0/ember-template-compiler.js"
  }
}

vg-consumer.component.js

import Ember from 'ember';

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

vg-consumer.template.hbs

{{yield}}

vg-receiver.component.js

import Ember from 'ember';

const { computed } = Ember;

export default Ember.Component.extend({
  data: computed('test', {
    get() {
      return Object.keys(this.attrs)
     		.filter(prop => prop.includes('data-'))
      	.reduce((prev, curr) => {
       		prev[curr.substr(5)] = this.attrs[curr];
        	return prev;
     		}, {})
    }
  })
});

vg-receiver.template.hbs

{{yield data}}
{{log this}}