rekru1

application.controller.js

import Ember from 'ember';

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

application.route.js

import Ember from 'ember';

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

application.template.hbs

<p>
  <b>Ember Global Meetup:</b>
  {{signup-component}}
</p>

<p>
  <b>Ember NYC:</b>
  {{signup-component}}
</p>

signup-component.component.js

import Ember from 'ember';

const { Component, observer } = Ember;

export default Component.extend({
  members: [],
  currentMember: null,
  membersAmount: 0,
  onAddedMembers: observer('members.[]', function() {
    this.set('membersAmount', this.get('members.length'));
  }),
  
  actions: {
    addMember(member) {
      this.get('members').pushObject(this.get('currentMember'));
      this.set('currentMember', null);
    },
    deleteMember(member) {
      this.get('members').removeObject(member);
    }
  }
});

signup-component.template.hbs

<div>
	Sign up:
	{{input type="text" value=currentMember}}
	<button {{action "addMember"}}>Add</button>
</div>

<ul>
  {{#each members as |member|}}
    <li>
      {{member}} 
      <button {{action "deleteMember" member}}>Delete</button>
    </li>
  {{/each}}
</ul>

<p>Members Amount: {{membersAmount}}</p>

twiddle.json

{
  "version": "0.6.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.3.1/ember.debug.js",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.3.3/ember-data.js",
    "ember-template-compiler": "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.2.0/ember-template-compiler.js"
  }
}