New Twiddle

components.comments-list.js

import Ember from 'ember';
import move from 'ember-animated/motions/move';

export default Ember.Component.extend({
  transition({ insertedSprites, keptSprites, removedSprites }) {
    removedSprites.forEach(sprite => {
      sprite.endAtPixel({ x: window.innerWidth });
      move(sprite);
    });
    keptSprites.forEach(move);
    insertedSprites.forEach(sprite => {
      sprite.startAtPixel({ x: window.innerWidth });
      move(sprite);
    });
  }
});

controllers.application.js

import Ember from 'ember';

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

controllers.index.js

import Ember from 'ember';
import faker from 'faker';

export default Ember.Controller.extend({
  actions: {
    addComment() {
      this.get('model').pushObject(faker.hacker.phrase());
    },

    removeComment(comment) {
      this.get('model').removeObject(comment);
    }
  }
});

routes.index.js

import Ember from 'ember';

export default Ember.Route.extend({
  model() {
    return [];
  }
});

templates.application.hbs

{{outlet}}

templates.components.comments-list.hbs

{{#animated-each comments use=transition as |comment|}}
  <p {{action removeComment comment}}>{{comment}}</p>
{{/animated-each}}

templates.index.hbs

<button {{action 'addComment'}}>Add comment</button>

{{comments-list
  addComment=(action 'addComment')
  comments=model
  removeComment=(action 'removeComment')}}

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-animated": "0.3.0",
    "ember-data": "2.16.3",
    "ember-fakerjs": "0.2.0"
  }
}